POLIOPTILA. te 
the superciliary stripe; but the locality assigned, of ‘‘ Mexico,” is 
opposed to the idea of its being the true bilineata. It is much 
larger than the female of superciliaris, 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 
Ist quill is more than half the 2d. It is specifically distinct, with- 
out doubt, from superciliaris, and if not bilineata, 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, 1.85; tail, 2.10; exposed portion of 1st primary, 
-68, of 2d, 1.28, of longest (measured from exposed base of Ist primary), 1.44; 
length of bill from forehead, .55, from nostril, .32 ; along gape, .60; tarsus, .70. 
Smith-| Collec-| Sex 
sonian| tor’s | and Locality. kas Received from Collected by ~ 
No. No. | Age e 
9,110 | 31,390 | 2? ““Mexico.”’ Bae WeBTCATEX | ota, eects 
i — 
Polioptila dumicola. 
Sylvia dumicola, Vieinu. Nouv. Dict. AI, 170.—Is. Encycl. Méth. II, 
1823, 433.—Polioptila dumicola, Scuater, P. Z. 8. 1855, 12.— Culi- 
civora dumicola, Burm. Reise La Plata, II, 1861, 473 (Montevideo 
and Parana). 
?Culicivora boliviana, ScuatEr, P. Z. 8. 1852, 34, pl. 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. 
