BIEDS OF NORTH AND MIDDLE AMERICA. 561 



[Chlorostilbon] caribieus Sharpe, Hand-list, ii, 1900, 113 (w. Venezuela; Trinidad; 



Aruba, Curasao, Bonaire, and Margarita islands). 

 Chlorostilbon caribhxa Robinson, Proc. U. S. Nat. Mus., xviii, 1896, 672 (Margarita 



I.), 682 (Quanta, Venezuela), 684 (La Guayra, Venezuela). — Robinson and 



Richmond, Proc. U. S. Nat. Mus., xxiv, 1901, 173 (coast of Venezuela). — 



Clark (A. H.), Auk, xix, 1902, 263 (Margarita I.). 

 Chlorostilbon caribbcus Simon and Dalmas, Ornis, xi, 1901, 212 (Gurayao). 

 Chlorostilbon caribbaus Lowe, Ibis, 1907, 559 (Margarita L). 

 [Chlorostilbon] caribeiis Simon, Cat. Troch., 1897, 18. 

 (?) Chlorostilbon caribbeus lessoni Simon and Dalmas, Ornis, xi, 1901, 212, 213 



(Carupano, Cariaco, Andes de Cumand, and Ciudad Bolivar, Venezuela). 

 [Chrysomiras atain] var. caribaeus Mulsant, Ann. Soc. Linn. Lyon, n. s., xxii, 



1876, 210. 

 (?) Chlorostilbon caribaeus nanus Berlepsch and Hartert, Novit. Zool., ix, 



April, 1902, 86 (Caicard, Venezuela; coll. Tring Mus.). 



Genus HELIOTHRYX Boie. 



Hcliothryx Boie, Isis, 1831, 547. (Type, Trochilus auritus Linnseus.) 



Heliothrys (emendation) Gray, List Gen. Birds, 1840, 14. 



Heliothrix (emendation) Strickland, Ann. Nat. Hist., vi, 1841, 419. — Cabanis 



and Heine, Mus. Hein., iii, March, 1860, 28. 

 Heliotrix (emendation) Bonaparte, Consp. Av., i, 1850, 69. 



Il<ather large Trochilidse (length about 100-120 mm.) with the 

 straight bill excessively compressed (finely wedge-shaped) anteriorly, 

 tail more or less graduated (but rectrices broadly roimded terminally), 

 under parts white, and with a black stripe on side of head. 



Bill (unfeathered portion) about as long as head, straight, rather 

 broad and depressed basaliy, excessively compressed terminally, 

 narrowly cuneate with finely acuminate tip, in vertical profile; cul- 

 men distinctly ridged throughout (but less sharply so posteriorly); 

 toinia smooth; mandible with a longitudinal, median narrow groove 

 on basal half only. Nasal operculum very narrow, completely hidden 

 by the dense, closely appressed frontal feathering, which extends to 

 or beyond anterior end of the nostrils, forming a short obtuse point 

 or antia on each side of culmen or these merged into a single, broader, 

 median antia. Feet excessively small; tarsus feathered on upper 

 portion, except on inner side; lateral toes about equal in length, 

 slightly shorter than middle toe; hallux much shorter than lateral 

 toes. Wing about four times as long as exposed culmen, the outer- 

 most primary longest. Tail about three-fifths as long as wing in adult 

 males to five-sixths as long in adult females, graduated, the rectrices 

 rather soft, with broadly rounded tip. 



Coloration. — Metallic gras.s-green or bronze-green above, the middle 

 rectrices bluish black, lateral rectrices and under parts pure white 

 (faintly spotted with grayish on chest in young); a black lorai, sub- 

 orbital and auricular stripe. Adult males with a stripe of brilliant 

 metallic emerald green beneath the black stripe on side of head, a 

 violet post-auricular tuft, sometimes with the pileum metallic violet. 



Range. — Guatemala to Guiana and Peru. (Three species.) 

 81255°— Bull. 50—11 36 



