Genera of Humming Birds. 17 



*24. ACESTRURA MICRURA, Grould, P.Z.S. 1853, p. 109. 



Myrmia rmcrura, Muls., Hist. Nat. Ois., m. t. iv., p. 11.3. 



Short Tailed Wood Star, Gould, Mon. Troch., vol. iii., p. 146. 



La Myrmie a coiirte queue, Muls., Hist. Nat. Ois., m. t. iv., 

 p. 113. 



Habitat. — Bolivia. 



Male. — Upperside bronze-green. Chin, sides of the throat, 

 and underside pale buff. Throat metallic amethyst. Under 

 tail-coverts white. Tail and bill black. 



Total length, 2| in. Wing, If. Tail, f. Culmen, li. 



Female. — Upperside bronze-green. Underside nearly white. 

 Tail black, lateral rectrices tipped with white. 



The types of this species are in the British Museum collec- 

 tion. They have five males and two females, which I have 

 studied with care, and was not able to see in what they differ 

 from A. heliodori. * 



GrENUS X. Chaetocercus, Gray, Gen. of Birds, 1853, p. 22. 

 Osalia, Muls and Verr, Class Troch., 1865, p. 92. 

 Polyxemus, Muls, Hist. Nat. Ois., m. 1877, t. 4, p. 123. 



Type : 0. Jourdani, Bourcier. 



Bill long as the head, straight, slender ; nostrils hidden in 

 frontal plumes. Median rectrices extremely short ; two next 

 the outermost long, equal, and uniform ; outermost about half 

 the length of the one next, filiform, graduating to a point, stiff. 

 Sexes unlike. 



Habitat. —Trinidad, Venezuela, Ecuador. 



25. Chaetocercus Jourdani, Bourc, Eev. Zool., 1839, p. 295. 



Mellisuga Jourdani, Gray, Gen. Birds, vol. i., p. 113. 



Galothorax Jourdani, Bon, Consp. Gen. Av., 1850, vol. i., 

 p. 85. 



Lucifer Jourdani, Eeich, Troch. Enum., 1855, p. 10. 



Osalia Jourdani, Muls. and Verr., Class. Troch., 1865, p. 32. 



Jourdan's Wood Star, Gould, Mon. Troch., vol. iii., p. 150. 



Le Chaetocerque de Jourdan, Muls, Hist. Nat. Ois., m. t. iv., 

 p. 125. 



Habitat. -Trinidad, Antillac. 



