158 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Coloration. — Plain olive or olive-brown above, lig'hter olive, 3^ellow- 

 ish, or dull grayish below, with or without yellow on throat; pileum 

 sometimes grayish or blackish, and sides of head sometimes with white 

 postocular spot or superciliary stripe. 



Range. — Southern Mexico to Bolivia, Peru, and western Ecuador. 



I feel obliged to exclude from this genus the species ranged by Dr. 

 Sclater, in the Catalogue of Birds in the British Museum (XI, p. 238), 

 under his Section B. {= Hemisping ns Cabanis), some of which, at least, 

 including the type of Heinkpmgus, almost certainly belong to the 

 MniotiltidsB. 



KEY TO THE SPECIES OP CHLOROSPINGUS. 



(I. Pileum gray, brown, or sooty black, very different from olive-green of back; chest 

 and sides yellowish olive-green or olive-yellow. 

 h. Malar region, chin, and throat white or buffy; chest yellowish olive, olive- 

 yellow or buffy yellow; whitish of abdomen more extended, 

 c. Postauricular region light gray or brown; pileum brown, grayish, or sooty; 

 white postocular mark a spot beginning at upper eyelid and extending back- 

 ward not farther than end of auricular region (usually not so far), 

 rf. Postauricular region (sides of neck) light gray; pileum gray. 

 e. Pileum and hindneck slate-gray, becoming dusky laterally; auricular 



region lighter gray. (Guatemala. ) Chloroapingns olivacens (p. 159) 



ec. Pileum and hindneck uniform dusky gray, the forehead and crown some- 

 times almost grayish black ; auricular region darker gray. (Guatemala; 

 State of Chiapas, southern Mexico.) . . Chlorospingus postocularis (p. 160) 

 dd. Postauricular region (sides of neck) brown; pileum brown. 

 e. Postocular white spot large, extending to end of auricular region ; malar 

 region white (sometimes tinged with buff posteriorly); chest pale 

 yellowish olive. 

 /. Pileum darker or duller brown; back clearer olive-green; chest and 

 sides brighter yellowish olive-green. (Southeastern Mexico, States 

 of Vera Cruz, Puebla, and Oaxaca.) 



Chlorospingns ophthalmicas (p. 100) 

 ff. Pileum lighter or brighter brown; back more brownish olive-green; 

 chest paler and duller yellowish olive. (Mt. Azul, Vera Cruz.) 



Chlorospingas samichrasti (p. 162) 

 ee. Postocular white spot small, not reaching nearly to end of auricular 

 region; malar region buffy; chest bright yellowish olive, olive-yellow 

 or buffy yellow. 

 /. Pileum lighter brown (deep broccoli or drab); forehead and lores dis- 

 tinctly white anteriorly; throat wholly brownish buff; chest buffy yel- 

 low or ochre-yelldw. (Southwestern Jlexico, in State of Guerrero.) 



CUorospingiis albifrons (p. 162) 



ff. Pileum darker brown (sepia or grayish sepia); forehead and lores 



wholly brown; throat white or brownish white, flecked with dusky; 



chest bright oUve-yellow. (Costa Rica to Venezuela and Bolivia.) 



Chlorospingns albitempora (p. 163) 

 cc. Postauricular region black, like auricular region; pileum black or sooty black; 

 postocular white mark a broad streak beginning above the eye and con- 

 tinued backward as far as end of black of neck. (Costa Rica and Chiri- 

 qiii- ) ChloroBpingus pileatna (p. 165) 



