BIRDS OF NORTH AND MIDDLE AMERICA. 283 



Kh. Bill and feet much smaller, the nasal operculum only moderately 

 tumid; outermost primary shorter than fourth (from outside), only 

 moderately broad (except in C. talpacoti and allies), the next 

 four with outer webs moderately einuated. .Chsemepelia (p. 393). 

 ee. Larger (wing more than 110 mm.) ; bare orbital region connected with rictus 

 by a narrow unfeathered line; or else (in genus Claravis) wings spotted, 

 feathering of forehead not advancing as far as malar antia, and tail trun- 

 cate; a more or less distinct tomial notch; maxilla relatively narrower 

 (laterally), with horny tip relatively much shorter and with lateral 

 groove extending much the greater part of its length. 

 /. Tail truncate; bare orbital Bpace small, the lores wholly feathered; 

 feathering of forehead with antia posterior to malar antia; wings 

 spotted with black, purplish, or brown; sexes very unlike in colora- 

 tion Claravis (p. 430). 



ff. Tail decidedly rounded; bare orbital space large, continued in a narrow 

 strip to rictus; wings not spotted; sexes essentially alike in coloration 

 (except in Oreopeleia, part). 

 g. Outermost primary shorter than seventh, abruptly attenuated termi- 

 nally Leptotila (p. 438). 



gg. Outermost primary longer than seventh (usually longer than sixth), 



not attenuated terminally. 



h. Bill much larger and stouter, the exposed culmen as long as first 



two phalanges of middle toe, the tomial notch distinct; feathers of 



of occiput and nape elongated, forming a decumbent, blended 



crest, those of forehead hair-like, somewhat stiffened. 



Geotrygon (p. 464). 



Kh. Bill much smaller and weaker, the exposed culmen much shorter 



than first two phalanges of middle toe (except in 0. mystacea); 



tomial notch obsolete; feathers of occiput and nape short, those 



of forehead not hair-like or stiffened Oreopeleia (p. 467). 



cc. Tail but little more than half as long as wing. (Outermost primary narrow, 



attenuated for terminal third) Osculatia (extralimital) fl 



55. Acrotarsium (as well as planta tarsi) covered with small hexagonal scales. 



Stamcenas (p. 496). 



Genus CHLORCENAS Reiehenbach. 



Chloroenas Reichenbach, Av. Syst. Nat., 1852, p. xxv. (Type, Columbafasciata 



Say.) 

 Chlorsenas (emendation) Bonaparte, Ann. Sci. Nat., Zool., (2), i, 1854, 140. 



Large arboreal pigeons (length about 240-415 mm.) with middle 

 toe (exclusive of claw) longer than tarsus, exposed portion of second- 

 aries longer than exposed portion of greater coverts, tail one-half to 

 two-thirds as long as wing, more or less rounded, and plumage of 

 hindneck neither squamated nor barred. 



Bill moderate in length (exposed culmen never longer than dis- 

 tance from its base to anterior angle of eye), usually rather slender 

 (very stout in O.jlavirostris), its greatest depth equal to only about 

 one-third the length of exposed culmen (except in C. Jlavirostris, in 



<* Osculatia Bonaparte, Compt. Rend., xl, 1855, 102; Consp. Gen. Av., ii, 1857, 73; 

 type, by monotypy, Geotrygon sapphirma Bonaparte. (Ecuador; two species.) 



