558 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



obliquely cuneate, and developed most on outer web; middle wing- 

 coverts with irregular terminal small spots of white; proximal sec- 

 ondaries light brown (becoming paler, almost white terminally, on 

 innermost), finely vermiculated or sprinkled with dusky and with a 

 very distinct mesial streak of black, this streak on some feathers with 

 several spot-like dilatations ; remaining secondaries dusky crossed by 

 four bands of pale cinnamon or clay colored spots, these more or less 

 broken by dusky vermiculations ; primaries dusky, spotted with 

 cinnamon-buff or light clay color, their terminal portion pale brown 

 vermiculated with dusky; two lateral rectrices (on each side) °- 

 sharply tipped with white (this about 17 mm. wide on outermost 

 and 15 mm. wide on the second, at widest part), the subterminal por- 

 tion (extensively) uniform dull black, the remainder duU black freckled 

 or mottled, in transverse series, with pale grayish buffy; loral, 

 orbital, auricular, and malar regions, chin, and upper throat dark 

 sooty brown or brownish black, very minutely vermiculated (at least 

 m part) with brown; lower throat white, forming a conspicuous broad 

 transverse bar or patch; jugular "apron" brownish black, the 

 feathers tipped with grayish vinaceous-brown, minutely vermicu- 

 lated vnih. dusky and with a shaft-streak of black, these brownish 

 tips smaller anteriorly, forming spots on the blackish ground, but 

 posteriorly covering the whole exposed surface of the feathers ; under 

 parts of body rather coarsely vermiculated brown and light grayish 

 (the upper breast more uniform brownish), the feathers with a black 

 mesial streak, many of them with a sagittate terminal spot of white ; 

 flanks and under tail-coverts barred with black and pale dull buffy; 

 bill brown, darker terminally; tarsi pale brownish, toes darker; 

 length (skins), 190-200; wing, 103-114; tail, 94-101; culmen (from 

 cere), 6.5-8; tarsus, 15.5-18; middle toe, 14.5.^ 



Adult female {rufescent 'phase) . — Similar to the adult male in grayish 

 phase, but the general grayish-brown coloration replaced by ruf escent 

 brown or russet, black streaks on pileum narrower, and white tips to 

 lateral rectrices slightly narrower (about 6 mm. wide on the outer- 

 most); length (sldns), 198-200 (199); wing, 110-117 (113.5); tail, 

 101-107 (104); exposed culmen, 10-10.5 (10.2); tarsus, 15-16 (15.5); 

 middle toe, 14.5-15 (14.7).'= 



Yucatan (Tizimin; Chichen-Itza; Xbac) and Campeche (Apazote), 

 southeastern Mexico. 



Caprimulgus yucatanicus HAUTEnT, Cat. Birds Brit. Mus., xvi, 1892, 575 (Tizimin, 



Yucatan; coll. Brit. Mus.). — Salvin and Godman, Biol. Centr.-Am., Aves, 



ii, 1894, 388, pi. 58a. 

 C[aprimulgus] yucatanicus Hartert, Tierreich, Podarg., Caprim., Macropt., 1897, 



40. 



« All the other rectrices are wanting in the specimen described. 

 b One specimen, 

 c Two specimens. 



