Genera of Humming Birds. "163 



Tail slightly forked. Median rectrires slightly smaller than 

 the next ones, which are also slightly smaller than the three 

 others. These of same length. Tarsi partly clothed. Sexes 

 alike. 



Habitat. — Mexico and Central America. 



234. Cvanomvi.Jl cv.\NOCEPHALA, Lesson, Suppl., Ois. Mou., 



1831, p. 134. 



Polytmus verticalis, Gray, Gen. Birds, vol. i., p. 109. 

 Uranomitra cvanocephala, Reich., Aufz. der Col., 1853, 

 p. 10. 



Agvrtria faustinae, Reich., Troch. Enum., 1855, t. i., p. 7 

 Cyanomvia guatemalensis, Gould, Int. Troch., 1861, p. 148. 



Uranomitra lessoni, Cab. and Hein., Mus. Hein., i860, 

 t. iii., p. 41. 



Leucolia cyanocepJiala , Muls., Hist. Nat. Ois. Mou., 1874, 

 t. i., p. 2ig. 



Black-billed Azure Crown, Gould, Mon. Troch., vol. v., 

 p. 286. 



La Leucolie a calotte d'asur, Muls., Hist. Nat. Ois. Mou., 

 1874, t. i., p. 220. 



Habitat. — Mexico and Guatemala. 



Male. — Top of head metallic blue with greenish reflections 

 in certain lights. Upperside bronzy-green, passing to bronzy- 

 brown on lower part of back and uppertail-coverts. Tail 

 pale green-bronze. Throat, middle of breast, and abdomen 

 white. Sides of neck, breast and flanks pale bronzy-green. 

 Undertail-coverts pale bronze, edged with grayish-white. 

 Maxilla black. Mandible flesh colour with black tip. Wings 

 purplish-brown. 



Total length, 4in. Wing, i\. Tail, if. Culmen, Ji. 



Female. — Exactly like the male, but the green on sides of 

 breast and flanks, slightly paler. 



235. Cyanomyia QUADRICOLOR, Vieillot, Enc. Meth., t. iii., 



P- 573- 

 Polytmus quadricolor, Gray, Gen. Birds, vol. i. p. 1 19. 

 Trochilus verticalis, Licht. Preis. Verz., Thier., 1830. 

 Uranomitra quadricolar, Reich., Aufz. der Col., 1853, p. 10. 



