752 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



dd. Lateral rectrices more extensively white (the basal black on outermost 

 pair restricted to a small area entirely concealed by under tail-coverts). 

 (Panamd to western Ecuador.) 



Trogon strigilatus cMonurus, adult male (p. 754). 

 hh. Pileum and chest "dead" slate-black or slate color, without trace of metallic 

 gloss (except, sometimes, very faintly, on occiput and hindneck). 

 c. Outermost pair of rectrices with much less than terminal third white. ( Trogon 

 melanocephalus .) 

 d. Head, neck, and chest slate-black to blackish slate. (Eastern Mexico 

 to northeastern Costa Rica.) 



Trogon melanocephalus melanocephalus, adult male (p. 756). 

 dd. Head, neck, and chest slate color to slate-gray. (Pacific coast district 

 of Costa Rica and Nicaragua.) 



Trogon melanocephalus illaetabilis, adult male (p. 759). 

 cc. Outermost pair of rectrices with terminal half, or more, white. (Western 

 Mexico.) 



Trogon citreolus, adult male (p. 759). 

 aa. Back, scapulars, rump, upper tail-coverts, and middle rectrices blackish slate to 

 slate-gray, like head, neck, and chest. {Adult females .) 

 h. Wing-coverts and secondaries narrowly barred with white or pale gray; lateral 

 rectrices barred with white, 

 c. Posterior under parts reddish orange or orange-red. 



Trogon bairdii, adult female (p. 753). 

 cc. Posterior under parts orange-yellow. {Trogon strigilatus.) 

 d. Lateral rectrices with white much less extended. 



Trogon strigilatus strigilatus, adult female (extralimital). 

 dd. Lateral rectrices with much more white. 



Trogon strigilatus chionurus, adult female (p. 755). 

 bh. Wing-coverts and secondaries plain blackish slate or slate color; lateral rectrices 

 not distinctly (if at all) barred with white. 

 c. White tip to lateral rectrices much shorter, with anterior outline more directly 

 transverse. {Trogon melanocephalus.) 

 d. Head, neck, and chest darker (slate-blackish). 



Trogon melanocephalus melanocephalus, adult female (p. 757). 

 dd. Head, neck, and chest more grayish (slate color to slate-gray). 



Trogon melanocephalus illaetabilis, adult female (p. 759). 

 cc. White tip to lateral rectrices much longer, with lateral outlines strongly oblique. 



Trogon citreolus, adult female (p. 760). 



TROGON BAIRDH Lawrence. 



BAIRD'S TROGON. 



Similar to T. strigilatus cMonurus, but posterior under parts bright 

 orange or orange-red instead of orange-yellow. 



Adult male. — Pileum and hindneck black, usually more or less 

 glossed with violet-blue ; back, scapulars, anterior lesser wing-coverts, 



Anim. in Menag., pt. iii, Jan. 1, 1838, 332 (Brazil; coll. W. Swainson); Gould, Mon. 

 Trog., ed. 1, 1838, pis. 10, 11, and text. — A[ganus] venustus Cabanis and Heine, Mus. 

 Hein., iv, Feb., 1863,194 (Colombia; coll. Heine Mus.). — T[rogon] ctjanurus Finsch, 

 Proc. Zool. Soc. Loud., Nov., 1870, 559, in text (Cayenne; coll. Bremen Mus.; ex 

 Hartlaub, manuscript). 



Like many other of the South American Trogons, this species unquestionably 

 requires subdivision. The specimens from southeastern Brazil, for example, are 

 very different from those from Cayenne, etc. 



