Specimens of Otus asio, recently collected in Oaxaca, M6xico, by C. C. Lamb, R. W. Dickerman, and J. T. Marshall, Jr., resemble the type of Otus asio vinaceus from extreme western Chihuahua, 1000 miles to the northwest. Yet a giant form, Otus aaio seductus of the Rio Balsas, is placed between them. All these Pacific coastal forms, known as the "vinaceous group" of screech owls, are now restored to the species Otus asio because vinaceous owls of the race sinaloensis intergrade with Otus ado cineraceus in Sonora (Miller and Miller, Condor, 53, 1951:172, 176) and because of the identity in voice and behavior of the two forms in that state. The population in Oaxaca may be named in honor of its discoverer as Otus asio lambi new subspecies Type.--Male immature, partly through postjuvenal molt, no. 54407, Moore Zoological Labora- tory; Rio Tehuantepec, 3000 feet, 2 miles west of Nejapa, Oaxaca, Mxico; collected September 27, 1952, by C. C. Lamb. Subspecific characters.--Resembles O. a. vinaceus in size and O. a. seductus in pattern, but is more intensely vinaceous above and below than either, although intermediate between them in dark- ness of the brown back. Blackish auricular rim reduced and less evident than that of seductus. Size small, only slightly larger than the small races sinaloensis and vinaceus. Coloration between seductus, one of the largest races in the genus, and vinaceus, but nearest the latter. Back darker vinace- ous-brown than the pink gray-brown of vinaceus, yet lighter and pinker than the deep ochraceous- brown of seductus. Pattern above and below only a trifle coarser than the fine linear markings of vinaceus, but vermiculations not composing the uniform background of that race, rather they are irregularly deflected to enclose light paired "eye" spots on either side of the shaft streaks, as in seductus, which has broader shaft streaks, however. Spedmens examined.--Otus asio sinaloensis--Sonora: 15/5, 12 9; Sinaloa: I /5 (type). O. a. vinaceus--Chihuahua: I 9 (type), Sinaloa: 2 9. O. a. seductus--Michoacn: 4 /5 (including type), I 9; Guerrero: 1 /5,2 9. O.a./amb/--Oaxaca: 2 miles west of Nejapa, 2 /5 (including type), I 9; 13 miles east of Juchitn, 1/5; Puerto Angel, I /5. Otus cooperi chiapensis--Oaxaca: Cacoprieta, I 9; Chiapas: 4 /5 (including type), 4 9. O. c. cooperi--E1 Salvador: 4 /5, 1 9; Nicaragua: 1; Costa Rica: 3 /5,6 9 (including types), 1 unsexed. Range.--Pacific slope of Oaxaca in thorn-woods dominated by candelabra cacti and in denser woods (including palms) surrounding coastal swamps exclusive of those at the eastern corner of Oaxaca, which are occupied instead by a geographically complementary form currently known as Otus cooperl chiapensis (specimen in British Museum, collected by Sumichrast at Cacoprieta = 3 leagues south o! Tapanatepec; dorsal coloration almost exactly like that of the type of chiapensis). Remarks.--The foregoing color comparisons involving hue are based on the following recently collected specimens which are at least partly in fresh adult plumage:. vinaceus, Moore Zool. Lab. no. 8494 and the most vinaceous specimens of sinaloensis, thought to suggest what the type of vinaceus would have looked like before fading (presumably darker, grayer, and pinker than the reddish-brown now manifest--Sheffler Collection nos. 2748, 4556; seductus, Western Foundation Vert. Zool. no. 3471; lambi, the type. In worn, faded plumage seductus and lambi resemble each other in back color, although the latter shows more prominently the contrastingly dark crown and the frosty areas around the face and hindneck. Weights available for two specimens each of the following races suggest that larnbi is of medium body size although possessing a relatively short wing: wings average about 148 ram. and weights about 97 gin. in sinaloensis; 170 min. and 165 gin. in seductta'; 152 min. and 130 gin. in lambi. We thank the authorities of the following museums for permitting Marshall's examination of their specimens of Otus asio and Otus cooperi from the Pacific slope of Middle America: Dickey Collection. University of California, Los Angeles; Western Foundation of Vertebrate Zoology; W.J. Shefiler Col- lection; Moore Zoological Laboratory; University of Kansas Museum of Natural History; Eizi Matuda Collection (Mxico, D. F.); A. R. Phillips Collection, Instituto de Biologia (Mxico, D. F.); United States National Museum; Museum of Comparative Zoology (type of Megascops vinaceus); and the British Museum (specimen from Cacoprieta).--RoBRx T. MOORE, Moore Zoologiccd Laboratory, Occidentcd College, Los Angeles, and JoE T. MARSHALL. JR., Western Foundation o! Vertebrate Zool- ogy, Los Angeles, Calijornia, October 5, 1958.