1889.] BREWSTER, Descriptions of New Birds. 97 
@ ad. (No. 14,386, collection of W. Brewster, Alamos, Sonora, Mexico, 
March 6, 1888; M. Abbott Frazar). Closely similar to the male but 
smaller. Length, 5.25*; extent, 7.25*; wing, 2.07; tail, 1.70; length of 
culmen from nostril, .42; depth of bill at nostril, .16 inch. 
This form is so very nearly allied to 7: sézaloa that I should 
not have ventured to separate it had I not had an opportunity to 
make a direct comparison of the twenty-four specimensf collected 
by Mr Frazar with seven examples of szzadoa (including Baird’s 
type) in the National Museum. Of the latter four are labelled 
‘*Mazatlan,” two ‘‘Plains of Colima,” and one simply ‘‘Sinaloa.” 
All seven have the upper mandible scarcely darker than the 
lower and of a very light horn color whereas in my birds, with- 
out a single exception, it is very dark slaty horn color in sharp 
contrast to the flesh colored under mandible. The coloring of 
the upper parts of my specimens is variable and in some examples 
not appreciably different from that of Baird’s type although my 
lightest, reddest extremes are very much duller or darker above 
than the lighter birds in the National Museum series of szaloa, 
while all my specimens, without exception, have the under parts, 
especially the sides and flanks, considerably duller and grayer. 
The distinct barring of the tail shown by both types of cézereus 
is a feature subject to excessive variation in my series at large and 
evidently quite worthless as a diagnostic character. 
In general terms the differences which separate 7hryophélus 
stnaloa cinereus from 7. stnaloa verus may be said to be closely 
parallel to, and of about the same constancy and value as those 
which distinguish Zyroglodytes aédon aztecus from 7. aédon 
verus. 
Grayson describes} the eggs of 7. s/zaloa as ‘‘usually five in 
number and marked with small specks of a brownish color.” 
All of the sixteen eggs (representing four sets of four eggs each) 
taken by Mr. Frazar are plain bluish white without the slightest 
trace of spots or other marking. 
Polioptila nigriceps restricta, new subspecies.—BLACK-FRONTED GNAT- 
CATCHER. 
Supsp. CHAR.—Similar to P. x/griceps but with the black of the pileum 
*These measurements taken by Mr. Frazar from the fresh specimen. 
t Of these five were taken at Alamos, Sonora, in February and March; the remain- 
ing nineteen at Hacienda de San Rafael, Caihuahua, in May, 1888. 
¢ Memoirs Bost. Soc. Nat. Hist. Vol. II, Part III, No II, p. 268, 
