732 BULLETIN 50, UNlTEt) StATES NATIONAL MtJSEXJJVt* 



Like the Barbets, the Trogons are found in the Tropics of both 

 hemispheres; but, unUke them, they are most numerous in America, 

 wliere eight genera and about thirty- two species occur. Two pecuhar 

 genera, with a single species eacli, occur in Cuba and Haiti, 

 respectively. 



KEY TO THE GENERA OF TROGONID^. 



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 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. 

 6. 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 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; 



