BASILEUTERUS. 945 
Basileuterus culiciverus. 
Sylvia culicivora, Licut. Preis-Verzeich. 1830, no. 78 (Mexico; Deppe 
& Schiede).—Cas. Jour. 1863, 57.—Basileuterus culicivorus, Bonar. 
Consp. 1850, 3135.—Cas. Mus. Hein. 1850, 17. 
Muscicapa brasier, Giraup, Birds Texas, 1841, pl. vi, fig. 2.—Basileuterus 
braseri, ScuaTER, P. Z. 8. 1855, 66 ; 1856, 292 (Cordova) ; 1859, 374 
(Oaxaca).—In. Catal. 1861, 34, no. 208.—Scuarer & Satvin, Ibis, 
II, 1860, 274 (Volcan, Guatemala). 
Hab. S. Mexico (both sides) ; Guatemala and Costa Rica. 
(No. 30,698.) Above greenish-ash, more tinged with olive on the upper 
part of back andrump. Beneath yellow, the crissum somewhat tinged with 
rufous. Top of head with a black stripe on each side from the bill, the inter- 
mediate portion greenish-yellow, passing more into green on the nape, similar 
in color to a supra-ocular stripe Loral region and space below eye greenish, 
mixed with yellow. Spot anterior to eye, and a stripe behind it, dusky; all 
these markings on the side of head, however, obscure, and poorly defined. 
Specimens from Mexico and Guatemala, the former marked male, have the 
median stripe of the head yellow. Others again, likewise from Guatemala 
and Mexico, have the yellow of each feather passing towards the end more 
into brownish-orange, apparently unaccompanied by any other differences. 
Length (of 30,698), 4.90; wing, 2.40; tail, 2.25; graduation, .16; bill from 
forehead, .50, nostril, .30, gape, .56; tarsus, .76; middle toe and claw, .56. 
This species differs from Basileuterus vermivorus and bivittatus, 
of South America, in having the upper parts ashy instead of olive 
green. The markings of the head are more as in bivittatus, as com- 
pared with vermivorus. The supra-ocular stripe and other lighter 
markings on the side of the head are greenish, and not ashy or gray- 
ish in their tinge. The eyelids are yellow, not white. There is much 
more yellow in the central stripe on top of heads even mixed with 
orange, and the feathers are not tinged with gray at the tips. The 
inside of the wing is greenish-yellow, not nearly white as in vermiv- 
orus; nor is there the decided indication of whitish in the chin. 
B. bivittatus, Laf., from Bolivia and Ecuador, as above stated, 
differs in the olive back, in this agreeing with vermivorus. It agrees 
more with culicivorus, and differs from vermivorus, judging from the 
description, in larger size, and in the yellowish superciliary stripe 
and circumocular region, instead of grayish-white. 
Norr.—Since writing the preceding description, specimens have 
been received from Mr. Carmiol, collected in Costa Rica, which 
differ slightly in having a decidedly olivaceous gloss to the upper 
plumage, especially on the rump and edge of the quills. Ido not 
note any other differences, and these may be merely seasonal. There 
is, however, in this respect, a greater approximation to the B. bivit- 
