98 BREWSTER, Descriptions of New Birds. [April 
restricted to the forehead and fore part of the crown, the hind crown and 
occiput concolor with the back, the black of the lores mixed with bluish 
ash. 
& ad. (No. 14,384, collection of W. Brewster, Alamos, Sonora, Mex- 
ico, March 7, 1888; M. Abbott Frazar). Above light blue-gray; beneath 
white. nearly pure over the middle of the abdomen and throat, tinged 
elsewhere with bluish gray, especially on the flanks and sides which are 
only a few shades lighter than the back; forehead and crown to about 
-20 inch behind the eye lustrous black; lores mixed black and gray, the 
former predominating; entire lower eyelid and a small spot on the upper 
eyelid white; outer tail feather white, except basally fora little less than 
one third of the outer web and one half of the inner web; next feather 
with the white reaching nearly to the base on the outer web and on the 
inner web .85 inch back from the tip; the third feather with the white 
extending back about two thirds of the length of the shaft on the outer 
web, .43 inch on the inner web. The fourth feather is missing but in 
another specimen it, also, is narrowly white-tipped. The tail, with the 
exception of the white areas just described, is black. The wings are clove- 
brown with a broad outer margin of whitish on the inner secondaries. 
Wing, 1.87; tail, 2.11; culmen from nostril, .31; tarsus, .72 inch. 
Flabitat. Southern Sonora (Alamos), Mexico. 
All of the seven black-capped Gnatcatchers collected by Mr. 
Frazar at Alamos agree closely with the specimen just described 
and differ from two Mazatlan specimens (one of them Baird’s type) 
of zzgriceps in the characters above mentioned. There is some 
variation inthe amount of black on the pileum, but this seems to 
be due to differences of age only, four of the seven specimens 
being in full breeding plumage. None of them have the black 
extending much further back than in the type. All have the lores 
more or less mixed with gray, and in two specimens (both, how- 
ever, immature) the gray predominates over the black. The 
type of zz¢gréceps, as Baird has said (Rev. Am. Birds, p. 69), has 
the entire under parts, including the flanks, white, but it is in 
very worn plumage, while my birds are in fresh feathering, a fact 
which may account for this seeming difference. Three female 
Gnatcatchers taken at Alamos with the males just mentioned are 
probably of the same form, although they differ from female 
cerulea only in having the tarsi rather longer and stouter and 
the lores lighter colored. One of them has the lores, as well as 
a distinct superciliary stripe, nearly pure white and hence agrees 
closely with P. dzléneata. 
