BIBBS OF NORTH AND MIDDLE AMERICA. 52S 



tail-coverts nearly immaculate; under wing-coverts blackish brown or 

 dusky transversely spotted with dull ochraceous, especially toward 

 edge of wiug; inner webs of primaries uniform blackish brown, in the 

 closed wing, but with a few small concealed spots of ochraceous or 

 ochraceous-buff; bill blackish brown, darker terminally; feet blackish 

 brown, the tarsi paler; length (skins), 241-245 (243); wing, 166.5- 

 167.5 (167); tail, 122.5-135 (128.7); exposed cuhnen, 14.5-16 (15.2); 

 tarsus, 17-18 (17.5); middle toe, 16.5-17 (16.7)." 



Adult femaleJ' — Much paler and more grayish than the adult male, 

 and closely resembling the adult female of A. v. macromystax, from 

 which the chief difiference consists in the greatly reduced size of the 

 tawny-ochraceous spots or bars on inner webs of primaries, sUghtly 

 darker general tone of coloration of upper parts (especially the middle 

 rectrices), and paler buff of collar across lower throat, length (skins), 

 232-243 (237.5); wing, 159-162 (160.5); tail, 113.5-123 (118.2); exposed 

 cuhnen, 14-15.5 (14.7); tarsus, 17.5-18 (17.7); middle toe, 17-17.5 

 (17.2)." 



YouTig. — ^Apparently distinguishable from the young of A. v. macro- 

 mystax only by the absence of distinct transverse spots on inner webs 

 of primaries. 



Extreme southern Mexico, in State of Chiapas (Valley of Comitdn; 

 Ocozucuantla; Teopisca) and Guatemala (Lake Atitl^n; TecpAm). 



(?) Antrostomus ? Owen, Ibis, 1861, 64 (Santa Barbara, Vera Paz, Guate- 

 mala; descr. eggs). 



(?) \Caprimulgus vodferus] subsp. a. Caprimulgus macromystax Hartbet, Cat. 

 Birds Brit. Mus., xvi, 1892, 570, part (Coban, Santa Barbara, and Volcan de 

 Fuego, Guatemala). 



Antrostomus cMapensis Nelson, Auk, xvii, July, 1900, 261 (VaUey of Comitan, 

 Chiapas; coll. U. S. Nat.' Mus.). — Dearborn, Pub. 125, Field Mus. N. H., 

 1907, 94 (Lake Atitlan and Tecpam, Guatemala, above 5,000 feet). 



ANTROSTOMUS OAXACffi Nelson. 



OAXACA WHIPPOOEWILL. 



Very similar to A. vodferus macromystax, but slightly darker above, 

 with black spots on pileum smaller, more triangular, with less light 

 mottling on scapulars, and breast spotted instead of vermiculated. 



Adult female." — Pileum brownish gray, minutely and indistinctly 

 freckled and vermiculated with darker, each feather (except on 

 lateral portions) with a terminal spot of black, these spots regularly 

 triangular on forehead and crown, more elongated and irregular on 



" Two specimens. 



6 Perhaps of this species, but possibly another form. If really the same, I know 

 of no other instance of such marked sexual difference in coloration among birds of 

 this family. 



The adult male is as yet unknown. 



