BASILEUTERUS. 243 



Top of head dusky, inclosing a lighter median ashy 

 stripe. Eyelids and supra-ocnlar stripe less 

 distinct. Sides tinged with olive green . superciliosus, Bd. 



Similar to last, hut creamy white heneath. Supra- 

 ocular stripe distinct. Sides tinged with rufous 



or fulvous stragulatus, Scl. 



Back dark brownish ; rump and base of tail yellowish semicerinnus,' Scl. 



uropygialisj Scl. 



The following are the better known species of Basileuterus from 

 South America: — 



Basileuterus verini-"orus. 



Sylvia vermivora, Vieill. Nouv. Diet. II, 1817,278. — Basileuterus v. Cab. 



Schomh. Guiana. — Solatee, Catal. 1861, 34, no. 34. 

 Setophaga auricapilla, Swains. Anim. Men. 1838, 293 (Brazil). 

 Hab. Bogota, Trinidad, Brazil, etc. 



Basileuterus hypoleucus. 



Basileuterus hypoleucus, Bp. Consp. 1850, 313. — Bubm. Uebers. Ill, 1856, 

 113 (Brazil). 



Basileuterus bivittatus.^ 



Muscicapa bivittata, Lap. & D'Orb. Syn. Av. 1837, 51. — D'Okb. 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 Trichas 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. 



' A specimen in the collection of the Philadelphia Academy I am unable to 

 refer to any of the described Basileuteri. 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 lower eyelid. 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, Bon. Consp. 313 (Brazil) ; but it is not smaller 

 than vermivorus, nor can the under parts be called white. 



