TROCHILUS. 313 



/ a . Lateral tail-feather in adult male not distinctly narrower 

 than the rest; rump and upper tail-coverts metallic 

 blue (in both sexes). 



Adult male : Head, including ruff, metallic purplish 

 red; length about 2.50, wing 1.15-1.40, tail .90, 

 culmen .50. Hob. Cuba. 



T. helenae (GtJNDL.). Princess Helena's Hummingbird. 1 

 e*. Tail with more or less of rufous, more or less graduated (mid- 

 dle feathers longest, or equal to longest) in both sexes; 

 adult males with top of head greenish or bronzy, totally 

 different from coldr of gorget (except in T. floresii). (Sub- 

 genus Selasphorus SWAINS.) 



f 1 . Middle pair of tail-feathers entirely green ; gorget of adult 

 male soft, rather light, rose-purple, or solferino ; wing 

 more than 1.90. 



Adult male: Tail-feathers, except middle pair, dull 

 purplish black, the next to middle pair distinctly 

 edged with rufous (the next pair sometimes nar- 

 rowly edged with same) ; length about 3.50-4.00, 

 wing 1.92-2.05, tail 1.40-1.60, exposed culmen .62- 

 .70. Adult female: Three outer tail-feathers rufous 

 at base and broadly tipped with white, the inter- 

 vening space blackish, with some green next to 

 rufous on second and third feathers; fourth feather 

 green to extreme base, but edged with rufous and 

 marked by a large terminal or subterminal spot 

 of black ; length about 4.10-4.25, wing 2.00-2.10, 

 tail 1.45-1.50, exposed culmen .70-.72. Eggs .50 

 X .33. Hob. Eocky Mountains of United States, 

 north to Wyoming, Montana, and Idaho Territo- 

 ries, west to Sierra Nevada (?), south over table- 

 lands of Mexico to highlands of Guatemala. 



432. T. platycercus SWAINS. 

 Broad-tailed Hummingbird. 



f 2 . Middle tail-feathers partly rufous ; gorget of adult male 

 intensely brilliant metallic fire-red, changing to orange, 

 brassy green, and crimson, the feathers much length- 

 ened laterally and posteriorly ; wing less than 1.90. 

 g l . Adult males with top of head dull bronzy or green- 

 ish, the middle tail-feathers rufous, marked on ter- 

 minal portion with a dusky mesial streak, the outer 

 feather with inner web entirely rufous, the belly, 



1 OrthorJiynchus Helena "GuNDL., sus manuscritos," LEMB., Aves de la Isla de Cuba, 1850, 70, pi. 10, fig. 2. 

 Calypte helense GOULD, Mon. Troch. iii. pi. 136. 



