SELASPHORUS. 355 
which it differs not only in the colour of the thorax, but also in that of the tail, the inner 
web of the outer rectrices being wholly purple-black instead of nearly wholly rufous. 
All the specimens of this species that we have seen were sent us by our collector 
Arcé from the Volcan de Chiriqui. It has also been found by several collectors on the 
Volcan de Irazu in Costa Rica 3 45, 
5. Selasphorus platycercus. 
Trochilus platycercus, Sw. Phil. Mag. new ser. i. p. 441'. 
Selasphorus platycercus, Gould, Mon. Troch. iii. t. 140 (May 1852)°; Scl. & Salv. Ibis, 1859, 
p. 129°; Salv. Ibis, 1860, p. 196‘; Cat. Strickl. Coll. p. 364°; Cat. Birds Brit. Mus. xvi. 
p- 396°; Scl. P. Z. S. 1864, p. 1777; Baird, Brew., and Ridgw. N. Am. Birds, ii. p. 462°; 
de Oca, La Nat. iti. p. 204, t. —°; Sumichrast, La Nat. v. p. 250"°; Boucard, Ann. Soc. 
Linn. Lyon, xxii. p. 19"; Herrera, La Nat. (2) i. p. 322. 
Selasforus platycercus, Dugés, La Nat. i. p. 141%; Villada, La Nat. ii. p. 352 ™. 
Ornismya tricolor, Less. Suppl. Ois.-Mouches, p. 125, t. 14”. 
Trochilus montanus, Less. Ind. gén. Troch. p. xxxiv'*; Sw. Birds Brazil & Mex. t. 74... 
Supra nitenti-olivaceo-viridis : subtus gula micanti-rosaceo-rubra, pectore albo, abdomine medio et tectricibus 
subcaudalibus albidis, hypochondriis viridi lavatis ; caudex rectricibus mediis dorso fere concoloribus, reliquis 
purpureo-nigris, sublateralibus ad basin cinnamomeo limbatis: rostro nigro. Long. tota circa 3°3, ale 1°95, 
caudee 1°3, rostri a rictu 0°8. 
? supra magis aurescens: subtus pallide cervina, gula et pectore albicantioribus, hypochondriis et tectricibus 
subcaudalibus magis cinnamomeis, gula maculis discalibus fuscis notata; caude rectricibus lateralibus ad 
basin cinnamomeis, medialiter nigricantibus, apicibus albis. (Deser. maris et femine ex Ajusco, Valley of 
Mexico. Mus. nostr.) 
Hab, Nort America, Utah, New Mexico, Colorado, and Arizona.—MeExtco (Bullock }, 
Mann*), Micoba in Sonora (W. Lloyd), Sierra de Valparaiso, Sierra de Calvillo, 
Sierra de Bolafios, Volcan and Sierra Nevada de Colima, Real del Monte, Tenango 
del Valle, Ajusco (W. B. Richardson ®), Hacienda Eslava in the Valley of Mexico 
(f. Ferrari-Perez®), Patzcuaro (Dugés 13), Rio Frio Ixtaccihuatl (W. B. &.°), Pinal 
Puebla (/. D. G.°), Puebla (Boucard"), Tonaguia (M. Trujillo 6), Valley of Mexico 
(de Oca°, White’, Sumichrast 1°, Herrera 2), Mirador (Sartorius, in U. S. Nat. 
Mus.), Alpine region of Orizaba (Swmichrast !°); Guatemata (Skinner ?), Quezal- 
tenango (0. S. & F. D. G.4, W. B. Richardson®), Chuipache and San Martin in 
Quezaltenango, Rincon in San Marcos (W. B. R.°), Mountains above Totonicapam, 
Paramos (0. 8. *). 
This species was first described by Swainson in his paper on Bullock’s Mexican 
collection ', and subsequently figured by the same author in his ‘ Birds of Brazil and 
Mexico’ !”, when he suppressed his original name in favour of Lesson’s Trochilus 
montanus, which had been bestowed on a bird supposed to have come from Brazil 1, 
From Mexico it has been traced northwards across the frontier as far as Utah, and it 
appears to be found, at least in the summer months, in all the South-western States of 
America from May to August. 
45* 
