Of all the pages in this splits collection, I am least certain about the taxa mentioned on this page, especially for the genera Otus and Glaucidium.

At present, the information on the Otus species is mostly based on König, Weick & Becking's book, as cited.
It remains to be seen how many of their taxonomic proposals will de adopted in the future.

Flores Scops-Owl     Otus alfredi
(Hartert)   1897
Indonesia: Flores Island
split from: Otus magicus
insert after: Otus mindorensis
W. Widoho, J.H. Cox & P.C. Rasmussen,
Rediscovery of the Flores Scops Owl, Otus alfredi, on Flores, Indonesia, and reaffirmation of its specific status
Forktail 15 (1999): 15-24
 

Rainforest Scops-Owl     Otus rutilus
(Pucheran)   1849
e Madagascar: rain forests to 2050 m.
 

Mayotte Scops-Owl     Otus mayottensis
Benson   1960
Comoro Islands: I. de Mayotte
split from: Otus rutilus
insert after: Otus rutilus
Pamela C. Rasmussen, Thomas S. Schulenberg, Frank Hawkins & Raminoarisoa Voninavoko,
Geographic variation in the Malagasy Scops-Owl (Otus rutilus auct.): the existence of an unrecognized species on Madagascar and the taxonomy of other Indian Ocean taxa
Bulletin B.O.C. 120, 2 (2000): 75-102
 

Torotoroka Scops-Owl     Otus madagascariensis
(Grandidier)   1867
c,w Madagascar: drier forests, villages and other degraded habitats
split from: Otus rutilus
insert after: Otus mayottensis
Pamela C. Rasmussen, Thomas S. Schulenberg, Frank Hawkins & Raminoarisoa Voninavoko,
Geographic variation in the Malagasy Scops-Owl (Otus rutilus auct.): the existence of an unrecognized species on Madagascar and the taxonomy of other Indian Ocean taxa
Bulletin B.O.C. 120, 2 (2000): 75-102
 

Anjouan Scops-Owl     Otus capnodes
(Gurney)   1889
Comoros Islands: Anjouan
split from: Otus rutilus
insert after: Otus pauliani
Roger J. Safford,
Rediscovery, taxonomy and conservation of the Anjouan Scops-Owl Otus capnodes (Gurney 1889)
Bird Conservation International 3, 1 (1993): 57-74
 

Pemba Scops-Owl     Otus pembaensis
Pakenham   1937
ne Tanzania: Pemba Island. Semi-open areas, especially clove plantations.
split from: Otus rutilus
insert after: Otus moheliensis
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

African Scops-Owl     Otus senegalensis
(Swainson)   1837
Sub-saharan Africa except W African forest belt, Congo Basin, most of Somalia, Madagascar, sw Namibia and c,n Cape Province (SA); se, sw Arabia
split from: Otus scops
insert after: Otus brucei
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Oriental Scops-Owl     Otus sunia
(Hodgson)   1836
n Pakistan: Punjab; Sri Lanka; India; Nepal e; n Japan; e Russia: e Siberia s; e China s to Malay Peninsula; Andaman and Nicobar Islands. Open and semi-open woodlands.
split from: Otus scops
insert after: Otus senegalensis
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Biak Scops-Owl     Otus beccarii
(Salvadori)   1876
e Indonesia: Biak Island, off nw Irian Jaya
split from: Otus magicus
insert after: Otus magicus
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Seychelles Scops-Owl     Otus insularis
(Tristram)   1880
Seychelles: Mahé Island, possibly still Praslin. Extinct elsewhere in Seychelles.
split from: Otus magicus
insert after: Otus beccarii
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Enggano Scops-Owl     Otus enganensis
Riley   1927
n Indonesia: Enggano Island off sw Sumatra
split from: Otus magicus
insert after: Otus umbra
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Sunda Scops-Owl     Otus lempiji
(Horsfield)   1821
s Birma; sw,s Thailand; Malaysia; Indonesia: Sumatra, Java, Borneo plus a few smaller islands
split from: Otus bakkamoena
insert after: Otus brookii
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Collared Scops-Owl     Otus lettia
(Hodgson)   1836
n Pakistan; n India; Nepal e to; e China s to; Taiwan; Hainan; n Thailand; c Birma. Migrates to s India and Malay peninsula.
split from: Otus bakkamoena
insert after: Otus lempiji
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Indian Scops-Owl     Otus bakkamoena
Pennant   1769
e Arabia: Oman; extreme se Iran; s Pakistan; India except extreme n; sw Nepal; w Bangladesh; Sri Lanka.
 

Moluccan Scops-Owl     Otus magicus
(Muller,S)   1841
Indonesia: Lesser Sundas (incl. Flores), Moluccas, Aru Islands (?)
 

Japanese Scops-Owl     Otus semitorques
Temminck & Schlegel   1850
e Russia: se Siberia, Ussuriland, Sakhalin, s Kuril Islands; Japan: from Hokkaido s to Izu Islands and Ryukyu Islands
split from: Otus bakkamoena
insert after: Otus bakkamoena
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Oaxaca Screech-Owl     Otus lambi
Moore & Marshall   1959
sw Mexico: Pacific slope up to 1000 m in Oaxaca
split from: Otus asio
insert after: Otus asio
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Pacific Screech-Owl     Otus cooperi
(Ridgway)   1878
sw Mexico: sw Oaxaca, Chiapas; Guatemala; El Salvador; Nicaragua; nw Costa Rica. (Semi-)arid woodland, palms, and shrub of Pacific lowlands up to 350 m.
split from: Otus kennicottii
insert after: Otus lambi
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Balsas Screech-Owl     Otus seductus
Moore-RT   1941
sw Mexico: s Jalisco and Colima s to Rio Balsas drainage in Michoacán and c Guerrero. Arid (semi-)open areas with scattered trees between 600-1500 m.
split from: Otus kennicottii
insert after: Otus barbarus
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Montane Forest Screech-Owl     Otus hoyi
König & Straneck   1989
cs Bolivia: from Cochabamba s to; nw Argentina: Salta, Jujuy, Tucumán, Catamarca (?). Montane forests between 1000-2800 m.
split from: Otus atricapillus
insert after: Otus roboratus
P. Heidrich, C. König & M. Wink,
Molecular phylogeny of South American Screech Owls of the Otus atricapillus complex (Aves: Strigidae) inferred from nucleotide sequences of the mitochondrial cytochrome b gene
Zeitschrift für Naturforschung, Section C, Biosciences 50, 3-4 (1995): 294-302
 

Columbian Screech-Owl     Otus columbianus
Traylor   1952
w Colombia: w Andes, from s Chocó s to Nariño; n Venezuela. Humid forests at 1300-2100 m.
split from: Otus ingens
insert after: Otus marshallii
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Cinnamon Screech-Owl     Otus petersoni
Fitzpatrick & O'Neill   1987
s Ecuador: Piura; n Peru: Cajamarca, Amazonas. Humid forests of e Andes between 1650-2450 m.
split from: Otus marshalli
insert after: Otus columbianus
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Southern Tawny-bellied Screech-Owl     Otus usta
(Sclater-PL)   1859
Brazil: s of Amazon River s to n Mato Grosso; e Peru: Ucayali, Madre de Dios; n Bolivia: Pando
split from: Otus watsonii
insert after: Otus watsonii
P. Heidrich, C. König & M. Wink,
Molecular phylogeny of South American Screech Owls of the Otus atricapillus complex (Aves: Strigidae) inferred from nucleotide sequences of the mitochondrial cytochrome b gene
Zeitschrift für Naturforschung, Section C, Biosciences 50, 3-4 (1995): 294-302
 

Roraima Screech-Owl     Otus roraimae
(Salvin)   1897
se Venezuela: Cerro Roraima, Cerro Duida; wc Guyana; nw Brazil: Pico Neblina. Rainforests between 1000-1800 m on steep slopes of tepuis and other mountains.
split from: Otus vermiculatus
insert after: Otus vermiculatus
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Middle American Screech-Owl     Otus guatemalae
(Sharpe)   1875
Mexico: se Sonora and Tamaulipas s; Belize; Honduras; nc Nicaragua; ne Costa Rica; Panama; w Colombia; n Venezuela; w,e Ecuador; e Peru; c Bolivia
split from: Otus atricapillus
insert after: Otus roraimae
P. Heidrich, C. König & M. Wink,
Molecular phylogeny of South American Screech Owls of the Otus atricapillus complex (Aves: Strigidae) inferred from nucleotide sequences of the mitochondrial cytochrome b gene
Zeitschrift für Naturforschung, Section C, Biosciences 50, 3-4 (1995): 294-302
 

Rio Napo Screech-Owl     Otus napensis
Chapman   1928
c Colombia; e Ecuador; c Peru s to; c Bolivia. Dense rain forests between 250-1500 m on e Andean slopes.
split from: Otus guatemalae
insert after: Otus guatemalae
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Southern White-faced Owl     Otus granti
(Kollibay)   1910
s Africa: most of Africa s of the Equator
split from: Otus leucotis
insert after: Otus leucotis
D.W. Holt, R. Berkley, C. Deppe et al.,
in: Handbook of the Birds of the World. Vol. 5, J. del Hoyo, A. Elliott & J. Sargatal (eds.), Barcelona, 1999
 

The Magellanic Horned Owl differs from the Great Horned Owl in its smaller size (also esp. in bill and talons), much smaller ear-tufts and denser barring on underparts.  The authors were lead to the differences through different local names for this form (called "Tucúquere" in Chile) and the lowland race B. v. nacurutu (called "Ñacurutú" in Argentina). These local names turned out to be indeed suggestive of the typical advertising calls of these forms.

B. magellanicus is monotypic: the authors clearly separate it from nacurutu, but their discussion also suggests strongly the unlikeliness that the form nigrescens (now and still in virginianus) belongs to it.

Sequence analysis of the mitochondrial cytochrome-b gene (960 base pairs) identified a genetic distance of 1.6% between magellanicus and nacurutu.

Magellanic Horned Owl     Bubo magellanicus
(Lesson)   1828
se Peru; w,c Bolivia; w Argentina; Chile s to Tierra del Fuego.  Rocky cliffs in Andes and Nothofagus woods in south of range
split from: Bubo virginianus
insert after: Bubo virginianus
Claus König, Petra Heidrich & Michael Wink,
Zur Taxonomie der Uhus (Strigidae: Bubo spp.) im südlichen Südamerika
Stuttgarter Beiträge zur Naturkunde, Serie A (Biologie), 540 (1996): 1-9
 

Spotted Eagle-Owl     Bubo africanus
(Temminck)   1821
se,s Arabia; Somalia; s Ethiopia; extreme s Sudan; Kenya; Uganda; e,s Congo Rep.s to S Africa.
 

Vermiculated Eagle-Owl     Bubo cinerascens
Guérin-Méneville   1843
Africa: most of tropical Africa n of Equator, without much overlap with B. africanus
split from: Bubo africanus
insert after: Bubo africanus
D.W. Holt, R. Berkley, C. Deppe et al.,
in: Handbook of the Birds of the World. Vol. 5, J. del Hoyo, A. Elliott & J. Sargatal (eds.), Barcelona, 1999
 

Brown Wood-Owl     Strix leptogrammica
Temminck   1831
peninsular India; Sri Lanka; s Bangladesh; w,s Burma; w,s Thailand; Malaysia; Indonesia: n,e Sumatra incl. some islands off w Sumatra, Belitung, Borneo
 

Bartels' Wood-Owl     Strix bartelsi
(Finsch)   1906
Indonesia: w Java e to Mt. Ciremai, Sumatra (?), Borneo (?)
split from: Strix leptogrammica
insert after: Strix leptogrammica
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Himalayan Wood-Owl     Strix newarensis
(Hodgson)   1836
ne Pakistan: Punjab e to; Nepal; Sikkim; n,c Burma; c,s China: Anhui, Jiangxi, Zhejiang, Fujian, n Guangxi Zhuang, Hainan; Taiwan s to; n,e Thailand; e Laos, n,c Vietnam. Dense evergreen, preferrably montane forests between 1000-2500 m, or higher.
split from: Strix leptogrammica
insert after: Strix bartelsi
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Short cut of a much longer recording.
© Juan Mazar Barnett. Recorded June 3, 1998, La Campana NP, Valparaiso, c Chile.

Rufous-legged Owl     Strix rufipes
King   1827
c,s Chile; cw,sw Argentina. Dense and moist Nothofagus forests on mountains.
 

This short cut is part of a longer track appearing on the CD-ROM Birds of Bolivia.
© Juan Mazar Barnett. Recorded September 19, 1997, San José de las Salinas, Córdoba, nc Argentina.

Chaco Owl     Strix chacoensis
Cherrie & Reichensberger   1925
e,se Bolivia; n,c,w Paraguay; n,c Argentina. Semi-open, dry shrub on hillsides (chaco).
split from: Strix rufipes
insert after: Strix rufipes
Roberto J. Straneck & Félix Vidoz,
Sobre el estado taxonómico de Strix rufipes (King) y de Strix chacoensis (Cherrie & Reichensberger),
Notulas Faunísticas 74 (1995): 1-5.
 

Short-browed Owl     Pulsatrix pulsatrix
(Wied)   1820
se Brazil: Bahia (?) s, Rio de Janeiro s to Rio Grande do Sul; ne Argentina?
split from: Pulsatrix perspicillata
insert after: Pulsatrix persipicillata
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Cape Pygmy-Owl     Glaucidium hoskinsii
Brewster   1888
nw Mexico: s Baja California. Pine and pine-oak forests between 1500-2100 m.
split from: Glaucidium gnoma
insert after: Glaucidium californicum
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Costa Rican Pygmy-Owl     Glaucidium costaricanum
Kelso,L   1937
Costa Rica; Panama
split from: Glaucidium jardinii
insert after: Glaucidium gnoma
Mark B. Robbins & F. Gary Stiles,
A new species of Pygmy-Owl (strigidae: Glaucidium) from the Pacific slope of the northern Andes
The Auk 116, 2 (1999): 305-315
 

Ridgway's Pygmy-Owl     Glaucidium ridgwayi
Sharpe   1875
USA; c,s Arizona, s Texas; Mexico: coastal lowlands, Yucatan; Central America s to; w Colombia, extreme nw Ecuador.
split from: Glaucidium brasilianum
insert after: Glaucidium brasilianum
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Tucuman Pygmy-Owl     Glaucidium tucumanum
Chapman   1922
se Bolivia; n,w Paraguay; n Argentina. Semi-open dry forest with shrub from 500-1800 m.
split from: Glaucidium brasilianum
insert after: Glaucidium ridgwayi
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Tamaulipas Pygmy-Owl     Glaucidium sanchezi
Lowery & Newman   1949
ne Mexico: sw Tamaulipas, e San Luis Potosí. Humid evergreen and pine-evergreen forests at 1500-2100 m.
split from: Glaucidium minutissimum
insert after: Glaucidium siju
Steve N.G. Howell & Mark B. Robbins,
Species limits of the Least Pygmy-Owl (Glaucidium minutissimum) complex
Wilson Bulletin 107, 1 (1995): 7-25
 

Colima Pygmy-Owl     Glaucidium palmarum
Nelson   1901
w Mexico: Sonora to Oaxaca. Pacific slope, dry woodland from sea level to 1500 m.
split from: Glaucidium minutissimum
insert after: Glaucidium sanchezi
Steve N.G. Howell & Mark B. Robbins,
Species limits of the Least Pygmy-Owl (Glaucidium minutissimum) complex
Wilson Bulletin 107, 1 (1995): 7-25
 

Least Pygmy-Owl     Glaucidium minutissimum
(Wied-Neuwied)   1830
e,se Brazil: n Bahia, Minas Gerais s to Santa Catarina; adjacent ce Paraguay. Evergreen rain forest up to 1000 m.
 

Central American Pygmy-Owl     Glaucidium griseiceps
Sharpe   1875
se Mexico; Belize; Guatemala; n Honduras; e Nicaragua; e Costa Rica; Panama; nw Colombia. Humid tropical evergreen forest to 1300 m.
split from: Glaucidium minutissimum
insert after: Glaucidium palmarum
Steve N.G. Howell & Mark B. Robbins,
Species limits of the Least Pygmy-Owl (Glaucidium minutissimum) complex
Wilson Bulletin 107, 1 (1995): 7-25
 

Unspotted Saw-whet Owl     Aegolius ridgwayi
(Alfaro)   1905
s Mexico: Chiapas; Guatemala; El Salvador; Costa Rica. Humid forests and open pine-oak woodland between 1350-2500 m.
split from: Aegolius acadicus
insert after: Aegolius acadicus
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Brown Boobook     Ninox scutulata
(Raffles)   1822
Pakistan; India; Sri Lanka; Nepal; s China; se Asia; Indonesia: Sumatra, Borneo, Java, Sulawesi, Moluccas; Philippines: Palawan

 

Northern Boobook     Ninox japonica
Temminck & Schlegel   1844
e Russia: Ussuriland; N & S Korea; n,c China; Japan
split from: Ninox scutulata
insert after: Ninox scutulata
Ben King,
Species limits in the Brown Boobook Ninox scutulata complex
Bulletin B.O.C. 122, 4 (2002): 250-257
 

Chocolate Boobook     Ninox randi
Deignan   1951
Philippines: all islands except Palawan
split from: Ninox scutulata
insert after: Ninox japonica
Ben King,
Species limits in the Brown Boobook Ninox scutulata complex
Bulletin B.O.C. 122, 4 (2002): 250-257
 

Philippine Hawk-Owl     Ninox philippensis
Bonaparte   1855
Philippines: all islands except Mindoro and Palawan

 

Mindoro Hawk-Owl     Ninox mindorensis
Ogilvie-Grant   1896
c Philippines: Mindoro Island. Forests and other wooded areas.
split from: Ninox philippensis
insert after: Ninox philippensis
Claus König, Friedhelm Weick & Jan-Hendrik Becking,
Owls, A Guide to the Owls of the World, Pica Press, United Kingdom, 1999
 

Moluccan Hawk-Owl     Ninox squamipila
(Bonaparte)   1850
e Indonesia: Halmahera, Ternate, Bacan, Buru, Seram, Tanimbar Islands
 

Christmas Island Hawk-Owl     Ninox natalis
Lister-JJ   1889
s Indonesia: Christmas Island, s off w Java
split from: Ninox squamipila
insert after: Ninox squamipila
J.A. Norman, L. Christidis, M. Westerman & F.A.R. Hill,
Molecular data confirms the species status of the Christmas Island Hawk-Owl Ninox natalis
Emu 98, 3 (1998): 197-208