BASILEUTERUS, 943 
Top of head dusky, inclosing a lighter median ashy 
stripe. Eyelids and supra-ocular stripe less 
distinct. Sides tinged with olive green . superciliosus, Bd. 
Similar to last, but creamy white beneath. Supra- 
ocular stripe distinct. Sides tinged with rufous 
orfulvous. : < . : . . stragulatus, Scl. 
Back dark brownish ; rump and base of tail yellowish semicervinus,'Scl. 
uropygialis, Scl. 
The following are the better known species of Basileuterus from 
South America :— 
Basileuterus vermivorus. 
Sylvia vermivora, Vie. Nouv. Dict. II, 1817, 278.—Basileuterus v. Cas. 
Schomb. Guiana.—Scuater, Catal. 1861, 34, no. 34. 
Setophaga auricapilla, Swarns. Anim. Men. 1838, 293 (Brazil). 
Hab. Bogota, Trinidad, Brazil, etc. 
Basileuterus hypoleucus. 
Basileuterus hypoleucus, Br. Consp. 1850, 313.—Bura. Uebers. III, 1856, 
113 (Brazil). 
Basileuterus bivittatus.? 
Muscicapa bivittata, Lar. & D’Ors. Syn. Av. 1837, 51.—D’Ors. Voyage, 
almost inappreciably lighter along the middle of the crown, the white on the 
eyelids very distinct. The bill is slender and narrow. Brazilian specimens 
exhibit a quite well defined band on each side of the crown from the bill, 
bordering a central stripe of slate gray; the white of eyelids is less promi- 
nent, and the bill decidedly broader. These differences, if constant, may 
render it desirable to establish the T’richas superciliosus, of Swainson, as a 
distinct species, under the name of Basileuterus superciliosus. 
' Not having seen a specimen of B. semicervinus, I am unable to give its 
diagnosis. Sclater says that B. uropygialis differs in having the uropygium 
and rump more lightly colored; the back olive, and head cinereous (instead 
of brown), almost as in stragulatus, with which, too, it agrees in color of lower 
surface. 
2 A specimen in the collection of the Philadelphia Academy I am unable to 
refer to any of the described Sasileuteri. There is a central line on top of 
head of pale yellowish-gray, the feathers dull yellowish at the base; on each 
side of this a broad black stripe (wider than in vermivorus), the two meeting 
on the forehead. A dirty whitish line passes from bill over eye to nape, and 
below this is another well defined line of blackish-ash, through and behind 
the eye, beginning as a dusky loral spot. There appears to be a whitish patch 
on the lowereyelid. The under parts, instead of being bright uniform yellow, 
are olivaceous white along the median line, clouded with purer olive on throat 
and breast; the sides of belly and body deep olive, like the back. 
This may be B. hypoleucus, Box. Consp. 313 (Brazil) ; but it is not smaller 
than vermivorus, nor can the under parts be called white. 
