Brewster on a Collection, of Arizona Birds . 2 03 
California (No. 6380, Sept. 19, 1881), taken during its first autumnal moult, 
has the old primaries (1-2) almost without attenuation, their tips being only 
slightly tapered, while the new ones (3-5) are as deeply notched as in any 
of the adults. Hence it is probable that males in first plumage will be 
found to have the primaries shaped like those of the female. 
The sexes of T. vert ica l is differ in a similar manner but less markedly, 
for the first primary of the female, although broader than that of the male, 
usually has the same falcate shape. I have one or two females, however, 
which, by the wing characters alone, can with difficulty be distinguished 
from females of vociferans. 
ioi. Myiarchus mexicanus cooperi* (Kauft) Baird. 
Cooper’s Flycatcher. — This large Myiarchus which, as I 
lately announced, f Mr. Stephens has the credit of first finding 
within our boundaries, was ascertained to be a common summer 
resident about Camp Lowell. Of its occurrence in New 
Mexico, also, I now have positive evidence, a previously unde- 
termined specimen, taken by Mr. Stephens near the Gila River, 
June 12, 1876, proving on comparison to be identical with the 
Arizona ones. 
The collector’s notes relating to the habits of this Flycatcher 
are disappointingly brief. It frequented low mesquites and was 
tame and rather noisy, having a variety of loud calls, some of 
which resembled those of M. cin'erescens , while others were 
“almost Thrasher-like.” Its food seemed to consist largely of 
beetles. On June 27 a nest was found at Camp Lowell. “Both 
parents were distinctly seen and positively identified. The nest 
was in an old Woodpecker’s hole in a giant cactus about eighteen 
feet from the ground. It was lined with soft, downy weed-seeds, 
and contained two young just hatched and an addled egg.” The 
egg, unfortunately, is so badly broken that accurate measurements 
are impossible, but an approximation would be 1 .04X -74* I n 
ground-color and markings it closely resembles eggs of M. crin- 
itus , the shell being a dull clayey-buff over which are numerous 
longitudinal lines and dashes of purplish-brown or. lavender. 
* The question of the relationship which M. cooperi, M. ery throe evens, M. mexicanus 
and M. crinitus bear to one another, and that of the respective names which should be 
. used for each, has been recently discussed at some length. (See Bull. U. S. Geolog. 
Surv., Vol. IV, pp. 32-33 ; ibid., Vol. V, No. 3,pp. 402-404; Proc. U. S. Nat. Mus., Vol. 
I 1, p. 139; and ibid., Vol. 3, pp. 13-15.) While I cannot claim to have personally in- 
i] vestigated the points at issue, I am at present inclined to follow Mr. Ridgway’s ruling, 
at least so far as M. coope?i is concerned. 
f This Bulletin, Vol. VI, pi 252. 
