BIEDS OF NORTH AND MIDDLE AMEBIOA. 559 



[Caprimulgus] yucatanicus Shabpb, Hand-list, ii, 1900, 84. 



Nyctagreits yucatanicus Cole, Bull. Mus. Comp. Zool., 1, 1906, 127 (Ohichen-Itza, 

 Yucatan). 



Genus CHORDEILES Swainson. 



Chordeiles Swainson, Fauna Bor.-Am., ii, 1§31, 496. (Type Caprimulgus vir- 



ginianus Gmelin.) 

 Chordeilus (emendation) Gray, List Gen. Birds, 1840, 7. 

 Chordediles (emendation) Cabanis and Heine, Mus. Hein., iii, Aug., 1860, 86. 

 Chordiles (emendation) Stjndevall, Met. Nat. Av. Disp. Tent., 1872, 86. 

 Microrhynchus (not of Gloger, 1825) Lesson, L'Echo du Monde Sav., W an., 



ser. 2, viii, no. 5, July 16, 1843, col. 109. (Type, Caprimulgus exilis Lesson= 



C. pruinosus Tschudi?) 

 Microrhynchos (emendation) Lesson, L'lScho du Monde Sav., 11" an., no. 39, 



May 19, 1844, 925; Compl. OEuvr. Buffon, xx, 1847, 259. 

 Ramphaoratus Bonaparte, Eivista Oontemporanea, ix, Feb., 1857, 215. (Type, 



Caprimulgus exilis Lesson.) 



Medium-sized Cliordeilinse (length about 210-225 mm.), with tail 

 cidedly more than haK as long as wing, distinctly emarginate ; tenth 

 utermost) primary equal to or longer than ninth, and nostrUs open 

 bie operculum small). 



BiU very small, the distance from nostrU to tip of maxiUa equal to 

 lOut one-fifth the length of commissure, the maxilla with a lateral 

 xved channel. Nostril rather large, opening laterally, more or less 

 [angular or subpyriform, longitudinal. Rictal bristles small and 

 iak, very indistinct. Wing long and pointed, the tenth (outermost) 

 imary longest or equal to ninth, exceeding distal secondaries by 

 icidedly more than half the length of wing. Tail between one-half 

 id three-fifths as long as wing, more or less deeply emarginate, the 

 teral pair of rectrices longest, the middle pair shortest. Tarsus 

 ual to or very slightly longer than middle toe without claw, the 

 )per haK (more or less) feathered, except behind; outer toe, without 

 3,w, reaching nearly or quite to penultimate articulation of middle 

 e, the inner toe slightly longer; hallux, with claw, decidedly longer 

 an basal phalanx of middle toe. 



Plumage and coloration. — Plmnage in general more compact, with 

 53 downy or velvety sturface, the primaries and rectrices more rigid 

 an in genera of the Caprimulginse; no special development of feath- 

 3 on sides of occiput, on chest, nor elsewhere. Upper parts more 



less mottled, marbled, or vermiculated (sometimes streaked) ; adult 



ales with a white area on primaries, and with more or less of white 



I tail. 



Range. — Temperate North and South America, Bahamas, and 



:eater Antilles. (About five species.) 



As in the case of Bubo virginianus,'^ I have followed Mr. Oberholser 



his treatment of the North and Middle American forms of Chor- 



a See pages 736-754 of this volume. 



