BIRDS OF NORTH AND MIDDLE AMERICA. 407 



the group of species composing the three so-called genera here tenta- 

 tively recognized constitute a very diflicult problem, for, apparently, 

 no matter whether they are combined into a single genus or divided 

 into several the definition of the group or groups is equally difficult in 

 either case. 



KEY TO THE SPECIES AND SUBSPECIES OF AMIZILIS. 



a. Chin and throat not while. 



h. Throat and chest metallic green. 

 c. Breast and abdomen not white. 

 d. Lores chestnut; sides, anterior flanks, and under wing-coverts uniform 

 metallic green or bronze-green; abdomen grayish (sometimes tinged with 

 buft'y). {Amizilis Izacatl.) 

 e. Abdomen brownish-gray. (Andes of Ecuador and Venezuela through 



Colombia to southeastern Mexico.) Amizilis tzacati tzacati (p. 408). 



ee. Abdomen decidedly buffy grayish (much paler in females). (Western 

 Ecuador and southwestern Colombia.) 



Amizilis tzacati jucunda (extralimital).« 



dd. Lores not chestnut; sides, anterior flanks, and under wing-coverts at least 



partly cinnamon-rufous or cinnamon-buff. {Amizilis yucatanensis.) 



e. Under parts of body deeper cinnamon-rufous, the sides without mixture 



of metallic bronze or bronze-green. (Tabasco, Campeche, Yucatan, and 



British Honduras.) Amizilis yucatanensis yucatanensis (p. 412). 



ec. Under parts paler cinnamon-rufous or cinnamon-buff, the sides glossed 



or intermixed with greenish bronze or bronze-green. 



/. Under parts of body light cinnamon-rufous or vinaceous-cinnamon; 



upper parts more greenish bronze. (States of Vera Cruz, Puebla, 



Oaxaca, and Chiapas.). .Amizilis yucatanensis cerviniventris (p. 414). 



ff. Under parts of body light cinnamon-buff to pale pinkish buff; upper 



parts more bronzy. (Southern Mexico, Tamaulipas, and Nuevo 



Leon.) Amizilis yucatanensis chalconota (p. 415). 



cc. Breast and abdomen white; tail glossed with metallic purple. (Western 



Mexico.) Amizilis forreri (p. 416). 



bb. Throat and chest cinnamon-rufous (more or less deep), like rest of under parts, 

 c. Sides of neck cinnamon-rufous. 



d. Smaller (wing 51-60, tail 31-37, culmen 19.5-23.5). {Amizilis rutila.) 

 e. Coloration pale, the under parts vinaceous-rufous or light cinnamon-rufous. 

 (State of Sinaloa, western Mexico, to Yucatan and eastern Guatemala 



and thence to western Costa Rica.) Amizilis rutila rutila (p. 416). 



ee. Coloration darker, the under parts deep cinnamon-rufous. (Pacific slope 



of Chiapas and Guatemala.) Amizilis rutila corallirostris (p. 419). 



dd. Larger (wing 66-69.5, tail 42-45.5, culmen 23.5-27). (Tres Marias Islands, 



western Mexico.) Amizilis graysoni (p. 419). 



cc. Sides of neck metallic greenish bronze. (Northwestern Costa Rica.) 



Amizilis bangsi (p. 420). 



a E[ranna] jucunda Heine, Journ. fur Orn., 1863, 188 (Babahoyo and Esmeraldas, 

 w. Ecuador; coll. Heine Mus.). — [Ariaria riefferi] var. jucunda Mulsant, Ann. Soc. 

 Linn. Lyon, xxii, 1876, 206. — Amazilia riefferi jucunda Berlepsch and Taczanowski, 

 Proc. Zool. Soc. Lond., 1883, 568 (Chimbo, w. Ecuador); 1884, 306 (Cayandeled and 

 Pinampunga, w. Ecuador). — Amazilia fu^cicaudata jucunda Hartert, Novit. Zool., v, 

 1898, 496 (Chimbo; habits). — A[mazilia]fuscicaudata jucunda Hartert, Daa Tierreich, 

 Troch., 1900, 5S.— Amizilis tzacati jucunda Oberholser, Proc. U. S. Nat. Mus., xxiv, 

 no. 1258, Jan., 1902, 317 (Santo Domingo, w. Ecuad6r). 



