MOMOTIDAE 
a. Bill compressed (deeper than wide./ at 
nostrils) the tomia more coarsely serrate. 
Momotus 
b. Pileum "blue (at least exteriorly). 
** M. lessonll 
bb. Pileum chestnut. 
M. castaneiceps 
aa . Bill depressed (wider than deep at nostrils 
the tomia more finely serrate. 
b. Culmen strongly carinate$ bill more 
strongly curved* as long as head; middle 
pair of rectrices with a racquet tip. 
£• Bill broader* width at nostrils equal to 
near one half^ distance from nostril to 
tip of maxilla; terminal racquet shorter 
than culmen; no superciliary tufts nor 
narrow, brightly-colored feathers on throat. 
Electron 
cc. Bill narrower* width at nostrils much 
less than one half distance from nostril 
to tip of maxilla; terminal racquet much 
longer than culmen; conspicuous superciliary 
tufts and narrow, brightly colored feathers 
on throat. 
Eumomota 
- ' S.' 
- 
bb. Culmen not carinate; bill less decurved* 
shorter than head; middle pair of rectrices 
normal. 
£• Tail much longer than wing. 
Aspatha* 
cc . Tail shorter than wing. 
Hylomanes 
