762 BULLEOTIN 50, UNITED STATES NATIONAL MUSEUM. 



longest, the tenth (outermost) very variable, sometimes not more 

 than half as long as ninth, sometimes more than half as long as 

 seventh (longest); tail decidedly (sometimes much) longer than 

 wing, all the rectrices (except, sometimes, outermost pair) truncate 

 or subtruncate at tip, the outermost pair more or less strongly bowed 

 basally. Tarsus about as long as longest anterior toe, naked for 

 about lower half; inner anterior toe united to outer toe for whole of 

 its first and half or more of its second phalanx. 



Coloration. — Adult males with chest and upper parts (except wings) 

 metalhc green, bronze, or blue (head sometimes black), the wing- 

 coverts and secondaries narrowly barred or vermiculated with white 

 and blackish, the middle rectrices broadly tipped with black; under 

 parts (posterior to chest) bright red, orange, or orange-yellow, this 

 usually separated from metallic green, bronze, or blue of chest by a 

 band of white; adult females with chest and upper parts brown or 

 slate color. 



Range. — Rio Grande Valley and southern Ainzona to eastern Peru, 

 Bolivia, Paraguay, Uruguay, Cayenne, and Trinidad. (About 

 fifteen species.) 



KEY TO THE SPECIES AND SUBSPECIES OF TROGONURUS. 



a. Back, chest, etc., bright metallic green, golden green, or golden bronze. (Adult 

 males.) 

 b. Lateral rectrices uniform black, except the broad terminal area of white; outer 

 web of primaries not edged with white. (Highlands of Mexico and Guatemala. ) 



Trogonurus mexicanus, adult male (p. 765). 

 66. Lateral rectrices barred or vermiculated with white; outer web of primaries 

 (except outermost) edged with white. 

 c. Under parts, posterior to chest, red or orange. 

 d. Lateral rectrices (three pairs) very broadly tipped with white. (Under parts 

 red, rarely orange.) 

 e. Lateral rectrices white, finely vermiculated or narrowly barred with black 

 (except the very broad terminal immaculate area) ; forehead (sometimes 

 crown also) black. 

 /. Lateral rectrices vermiculated ; middle rectrices golden or coppery ; tail 

 shorter (152.5-171). (Trogonurus ambiguus.) 

 g. Above more golden or bronzy, the middle rectrices frequently cop- 

 pery bronze; tail averaging longer (1G5.6 mm.). (Highlands of 

 Mexico to southern Arizona and Rio Grande Valley in Texas.) 



Trogonurus ambiguus ambiguus, adult male (p. 768). 

 gg. Above more greenish, the middle rectrices bronze-green to greenish 

 bronze (never coppery); tail averaging shorter (155.8 mm.). (Tres 

 Marias Islands, western Mexico.) 



Trogonurus ambiguus goldmanl, adult male (p. 772). 



ff. Lateral rectrices narrowly and regularly barred ; middle rectrices green 



or golden green; tail longer (161.5-180.5 mm.). (Pacific slope, from 



Guatemala to Costa Rica.). .Trogonurus elegans, adult male (p. 773). 



