Among rarities in the Mexican collections of the late Milton S. Ray are two Eared Poor-wills of the genus Otophanes taken by Wilmot W. Brown in the vicinity of Chilpancingo, Guerrero, Mexico. The species Otophanes mcleodii has for long been known principally from two specimens: the type, a female in the Brewster Collection at the Museum of Comparative Zoology, which was taken in the Sierra Madre of western Chihuahua by McLeod on December 6, 1884 (Brewster, Auk, 5, 1888:89), and a male in the British Museum taken at Hacienda de San Marcos, 8000 feet, Zapotlan, Jalisco, by Lloyd on May 11, 1889 (Hartert, Cat. Birds Brit. Mus., 16, 1892:582; Salvin and Godman, Biologia Centrali-Americana, Aves, 2, 1894:392). The supposed occurrence of the species in Sonora and Vera Cruz (Sharpe, Hand-list Birds, 2, 1900:83) has properly been doubted (Peters, Birds World, 4, 1940:195; van Rossem, Occas. Papers, Mus. Zool., Louisiana State Univ., 21, 1945:293). No truly new information on this poor-will seems to have appeared in the literature since the early part of the century. Recently, Ed N. Harrison and W. J. Scheffler have taken four Otophanes mcleodii on the SonoraChihuahua line at the headwaters of the Alamos River of extreme southern Sonora, latitude 270 7', longitude 1080 35', 5000 feet. When the Guerreran specimens were first examined, it was not apparent whether they were closely related to Otophanes mcleodii or annectent with Otophanes yucatanicus, a species which has been generically separated from Otophanes as Caprimulgus (Hartert, op. cit.: 525) and later as Nyctagreus (Nelson, Proc. Biol. Soc. Wash., 14, 1901:171; Ridgway, Bull. U. S. Nat. Mus. No. 50, pt. 6, 1914:556). After assembling comparative material it became obvious that the Guerreran birds were in no way intermediate in characteristics between mcleodii and yucatanicus, even though they were intermediate geographically and were darker colored than mcleodii. In all aspects of pattern, most importantly the lack of dark shaft streaks on the crown, back, breast shield, and tertials and the presence of well defined sagittate white spots, rather than bars, on the upper belly, the Guerreran birds show complete accordance with mcleodii. The shape and development of the ear tufts in them also is similar. There is as yet, then, no evidence that yucatanicus and mcleodii are linked as one species, and although such linkage is still not impossible, the situation in Guerrero reduces this likelihood.