POLIOPTILA. 



73 



the superciliary stripe; but the locality assigned, of "Mexico," is 

 opposed to the idea of its being the true hilineata. It is much 

 larger than the female of super ciliaris, with the white on side of head 

 much purer, though otherwise similar. The outer tail feather is 

 entirely white, except at the concealed base ; the next has basal 

 half of inner web black, this color extending much beyond the black 

 of outer web ; the third is white for the terminal fourth or fifth. The 

 1st quill is more than half the 2d. It is specifically distinct, with- 

 out doubt, from superciliaris, and if not hilineata, and really from 

 Mexico, probably indicates the existence of a third species with 

 black head. Compared with a supposed female of P. albiloris, the 

 bill is weaker, size larger, more white on the head and tail, etc' 



Total length, 4.50 ; wing, 1.S5 ; tail, 2.10 ; exposed portion of 1st primary, 

 .68, of 2d, 1.28, of longest (measured from exposed base of 1st primary), 1.44 ; 

 length of bill from forehead, .55, from nostril, .38 ; along gape, .60 ; tarsus, .70. 



Polioptila diimicola. 



Sylvia dumicola, Vieill. Nouv. Diet. aI, 170. — Ib. Encycl. Meth. II, 

 1823, AZ?,.— Polioptila dumicola, Sclatek, P. Z. S. 1855, 12.— Culi- 

 civora dumicola, BuRM. Raise La Plata, II, 1861, 473 (Montevideo 

 and Parana). 



? Culicivora boliviana, Sclatek, P. Z. S. 1852, 34, pi. 47 (Bolivia). 



Hab. La Plata States ; Bolivia ? 



I am by no means satisfied that the boliviana, of Sclater, is not 

 a different species from dumicola, at least Smithsonian specimens 

 from the two localities are readily distinguishable. The La Plata 

 bird is nearly uniform lead gray below, including the lining of the 

 wing; on the throat and breast not very much lighter than on the 

 back, becoming paler posteriorly, but nowhere white. In the Bolivian 

 the under parts may be called dull white, with a slight tinge of 

 plumbeous on the throat, and a rather deeper shade of the same 

 across the breast ; the cheeks below the black patch are quite clear 

 white, and not dark plumbeous. The light edgings on the wings 

 are more conspicuous. 



' The tail feathers are almost too much worn for comparison with the dia- 

 gram furnished by Prof. Peters, but they do not appear materially different. 



