N0.125.S. COLLECTION OF HUMMINGBIRDS— OBERHOLSER. 335 
L. tyrianthina qultens/s. From specimens collected at various locali- 
ties on the west slopes of the mountains, and which represent quitensis, 
the present birds ditfer very materially, being decidedh' smaller, rather 
darker, less brownish below, and with a more purplish g-loss to the tail. 
LATICAUDA TYRIANTHINA QUITENSIS (Gould). 
M'lalhmt (juitentiis Govld, Introd. Troch., 1861, p. 112. 
Mt'tdllura tyrianllnria ijnite)isis E. and Cl. Hartert, Xovit. Zool., I, 1894, p. 48. 
Twenty -eight specimens, from the followino- localities in Ecuador: 
Pichincha; Atacazo; Jambillo; Jablon; Corazon. This is a readily 
recognizable race, and replaces true ti/pi(inth!na on the west side of 
the mountains. An adult male from Atacazo exhibits a very pretty 
case of partial albinism, the whole forehead being pure white, and a 
few white feathers intermingled with the plumage of the breast. 
Albinism seems to be of rather rare occurrence among the Trochilidje, 
thus making this case worthy of record. 
A very common bird in western Ecuador at altitudes Itetween 9,000 and 12,000 
feet, and, like all the other members of this genus we came across, were chiefly found 
feeding very early in the morning; often at no other part of the day could we find 
them. Local name, " Ubellus coniun." 
CHALCOSTIGMA HERRANI (Delattre and Bourcier). 
Trochilus herraid Delattre and Bourcier, Rev. Zool., 1846, p. 309. 
Chalcosligma herrani Simon, Cat. Troch., 1897, p. 33. 
Six specimens from Pichincha, west Ecuador. 
These birds appear on Pichincha about January and remain until May, when they 
entirely disappear, no one knows whither. During their stay they seem to frequent 
only the west and north sides of the mountain, at about 12,000 feet elevation. I was 
told that some years very few come, and that they sometimes stay away for two years 
together. Local name, " Ubellus finos." 
CHALCOSTIGMA STANLEYI (Bourcier). 
Trocldlus stanleyi Bourcier, Compt. Rend. Ac. Sci., XXXII, 1851, p. 187. 
Chalcostigma stanlei/i Simon, Cat. Troch., 1897, p. 33. 
Four specimens, from Papallacta and Pichincha, Ecuador. 
RAMPHOMICRON MICRORHYNCHUM (Boissonneau). 
Ornismya microrJiyncJia Boissonneau, Rev. Zool., 1839, p. 354. 
Ramphomicroii microrhyncha Bonaparte Consp. Avium, I, 1850, p. 79. 
Thirty-tive specimens, from Papallacta {11,500 feet) and Pichincha, 
Ecuador. There seems to be absolutely no appreciable difference 
between birds from these two localities which represent respectively 
the east and west sides of the mountains. Examples from Colombia 
have often a somewhat shorter wing, and in the males there is fre- 
quenth' a deeper ochraceous suffusion on the posterior lower parts, 
but these characters are apparently too inconstant to warrant recog- 
nition in nomenclature. Several of the young males in the present 
