732 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Like the Barbets, the Trogons are found in the Tropics of both 
hemispheres; but, unlike them, they are most numerous in America, 
where eight generaand about thirty-two speciesoccur. Two peculiar 
genera, with a single species each, occur in Cuba and Haiti, 
respectively. 
KEY TO THE GENERA OF TROGONIDA. 
a. Tomia without serrations (only the subterminal notch being present); nostril nar- 
row, longitudinal, overhung by a broad operculum; adult males with upper tail- 
coverts distinctly outlined, the longest much more than half as long as tail 
(sometimes greatly exceeding the tail in length); middle wing-coverts very 
large, distinctly outlined, sometimes elongated. 
b. Culmen elevated basally, the depth of the bill at nostrils equal to or greater than 
its width at same point; loral feathers closely appressed, antrorse anteriorly; 
middle wing-coverts elongated, more or less pointed; adult males with longer 
upper tail-coverts reaching to or beyond tip of tail, distinctly narrowed 
terminally’ so s42ccassmeeetemecndeceeeeee ete eeeee ees Pharomachrus (p. 733). 
bb. Culmen depressed basally, the depth of bill at nostrils less than its width at 
same point; loral feathers retrorse, not closely appressed; feathers on sides 
of occiput elongated, very slender, forming a filamentous tuft; middle wing- 
coverts broadly rounded, not elongated; adult male with longer upper tail- 
coverts falling far short of tip of tail, more broadly rounded terminally. 
Leptuas (p. 740). 
aa. Tomia distinctly serrated, especially on mandible; nostril roundish, nonopercu- 
late; adult males with upper tail-coverts blended, the longest less than half as 
long as tail; wing-coverts small, or at least not elongated nor conspicuously 
large. , 
b. Auricular feathers normal; eyelids naked, forming a conspicuous orbital ring 
(brightly colored in life); sexes very different in color, the adult females with- 
out metallic hues; anterior toes united for more than basal phalanx. 
c. Larger and more stoutly built, with larger and heavier bill; tarsus decidedly 
shorter than longest anterior toe, the feet much stronger. 
d. Anterior toes united for first and second phalanges; tail less strongly gradu- 
ated, the rectrices more rounded at tip, the lateral rectrices without 
white, or else with only narrow bars of that color, never tipped with white; 
abdomen and under tail-coverts red; adult males with chest and upper 
parts metallic bronze-green to bluish green, the wing-coverts and sec- 
ondaries vermiculated; adult females with chest and upper parts slate 
color; young conspicuously spotted, very different from adults. 
Curucujus (p. 742). 
dd, Anterior toes united for first phalanx and only part of second phalanx; tail 
more strongly graduated, the rectrices broader and more truncated at tip, 
the lateral rectrices with much white (outermost ones sometimes wholly 
white); abdomen and under tail-coverts yellow or reddish orange; adult 
males with head black or slate color (the pileum sometimes metallic 
violet-blue), back, etc., metallic green, blue, or violet-blue, wing-coverts 
and secondaries uniform black or slate color; adult females with head, 
neck, chest, and upper parts slate color; young essentially like adult 
female in coloration...............2222. 5-20.22 c ee eee eee Trogon (p. 750). 
cc. Smaller and more slightly built, with relatively smaller and weaker bill; tarsus 
as long as longest anterior toe, the feet much weaker. (Tail always with 
more or less white, the lateral rectrices broadly tipped and usually barred 
with that color; abdomen and under tail-coverts red, orange, or yellow; 
