BIRDS OF NORTH AND MIDDLE AMERICA. 345 



row ridge; tomia smooth; maxilla with a rather broad longitudinal 

 groove above middle line. Nasal operculum rather narrow, nearly 

 straight along edge, mostly nude, the frontal feathering extending 

 to or beyond the middle of operculum (sometimes nearly to its 

 anterior end), forming a short point or antia on each side of the 

 mesorhinium. Tarsus naked ; lateral toes about equal, slightly shorter 

 than micklle toe, the hallux about as long as lateral toes. Wing less 

 than half to more than twice as long as ex]3osed culmen, the outer- 

 most primary longest. Tail about half as long as wing, truncated 

 or slightly rounded, the rectrices very firm, rounded or, sometimes, 

 rather pointed at tip. 



Coloration. — Above bronze, greenish bronze or bronze-green, or 

 olive glossed with metallic bronze, etc., the rump with a white spot 

 or streak; adults with tlu'oat (at least its lower portion) metallic red 

 or purple, the remaining under jiarts grayish (sometimes glossed with 

 bronze or greenish laterally) paler (sometimes white) along median 

 line; under tail-coverts white terminally and laterally, dusky grayish 

 centrally; outer rectrices tip])ed witli white. wSome species with 

 pileum l^right metallic blue or green. 



Range. — Mexico to Guiaiui, Bolivia, and Ecuador. (About six 

 species.) 



KEY TO THE SPECIES AND SUBSPECIES OF ANTHOSCENUS. 



a. Feathers of throat without paler margiu.s; adult males with forehead and crown 

 bright metallic blue or bluish green, very different from color of back, etc. 

 b. Under tail-coverts mostly white. (Ecuador.) 



Anthoscenus albicrissa (extralimital).o 

 bb. Under tail-coverts mostly dusky. {Anthoscenus longirostris .) 

 c. Adult males with forehead and crown blue or greenish blue. (Amazon Valley, 

 Guiana, and Triniddd to Costa Rica.) 



Anthoscenus longirostris longirostris (j). 346). 

 cc. Adult male with foreliead and crown bluish green. (Guatemala and southern 



Mexico Anthoscenus longirostris pallidiceps ( p. 349). 



aa. Feathers of throat narrowly margined with pale grayish or dull whitish (very 



conspicuous when viewed from behind); adult males with forehead and crown 



dull metallic green or bronze-green, concolor with back or duller. {Anthoscenus 



constantii.) 



b. Coloration darker; metallic red of throat more extensive, occupying most if not 



all of throat; chin sooty blackish. (Guatemala to Costa Rica.) 



Anthoscenus constantii constantii (p. 350). 

 bb. Coloration paler, at least below; metallic red of throat more restricted, con- 

 fined to extreme lower portion; chin and upper throat grayish. (South- 

 western and western Mexico.) Anthoscenus constantii leocadi8e (p. 352). 



^ Heliomaster albicrissa Gould, Proc. Zool. Soc. Lond., 1871, 504 (Citado, Ecuador; 

 coll. J. Gould). — Heliomastes albicrissa Mulsant and Verreaux, Hist. Nat. Ois.-Mouch., 

 ii, 1876, 274^.— Floricola albicrissa Elliot, Classif. and Synop. Troch., 1879, 83; Salvin, 

 Cat. Birds Brit. Mus., xvi, 1892, 231. — F[loricola] albicrissa Ilartert, Das Tierreich, 

 Troch., 1900, 192. — [Floricola] long [irostris] albicrissa Simon, Cat. Troch., 1897, 37. 



