POLIOPTILA. 69 
Polioptila migriceps. 
Polioptila nigriceps, BarrD, n. s. 
*,. Above clear pure light bluish gray ; beneath pure white, including the 
fianks. Entire top of the head and sides, including lower eyelids, lustrous 
black. <A slight ashy tinge on the sides of the neck. Only a few feathers 
in the eyelids white. Outer tail feather white, except for the basal con- 
cealed third, as is also the outer web, except at the base, and the terminal 
fourth (or .65 of an inch) of the next. Third feather with the inner web 
tipped with white for about a quarter of an inch: perhaps in the unworn 
feather extending a little on the outer web. First primary broad, about half 
as long as the 2d. No white on secondaries, or else worn off in this specimen. 
Length, about 4.50 inches; wing, 1.95; tail, 2.15; bill above, .48; from 
gape, .32; tarsus, .75. 
Hab. Mazatlan. 
This interesting new species of Polioptila resembles P. melanura 
in general appearance, but will be readily distinguished by the white 
outer tail feather and much purer white of the under parts. The 
gray above is lighter and clearer; the bill is larger (equal to that of 
cerulea), and the tarsi are longer. The black cap seems to extend 
farther down the side of the head, and along the nape. 
The species appears well characterized by the length of the tarsi, 
which exceed those of any other species known to me; the bill is 
not so stout as, and decidedly shorter than that of P. albiloris (32,556), 
and there is no trace of white in the lores, or between eye and Dill. 
The tail is longer; the Ist primary only half the 2d. 
From leucogastra it differs in the smaller size, shorter bill and 
longer tarsi, narrower tail feathers and less amount of white on the 
tail, as well as different geographical distribution. P. buffoni has 
the outer tail feather entirely white, and the 2d and 3d white almost 
to the base. The tail is considerably shorter. 
Smith-| Collec-| Sex 
a When : 
sonian| tor’s | and Locality. | Received from Collected b 
No. No. | Age. sala Collected. y 
23, 7i | 294 | ¢ ve ihiaeanlant: | Tulyeu lsgit |i Laser a Ie age 
23,781. Type. 
Polioptila leucogastra. 
Sylvia leucogastra, Max. Beit. III, 1830, 710.—Polioptila leucogastra, 
Scrater, P. Z. 8. 1855, 12 (in part).—In. Cat. 1861, 12, no. 74.— 
Culicivora leucogastra, Burm. Th. Bras. Vézel, 1856, 111. 
Culicivora atricapilla, Sw. Zool. Ill. N. S. pl. lvii (not of LAWRENCE). 
Culicivora dumecola, Box. Consp. 1850,.316 (not of Vrernuor). 
