l^l{K\vsiiiR 0)1 a CoJIcctio)i of Ari~oi/a JiirJs. 203 



Ciilitbniia ( No. 63S0. Sept. ly, iSSi), taken durini;- its first iiutuninal moult, 

 has the old primaries (1-2) ahnost without attenuation, their tips being only 

 slightly tapered, while the new ones (3-5) are as deeph' 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. verticalis 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. 1 have one or two females, however, 

 which, by the wing characters alone, can with difficulty be distinguished 

 from females of vociferous. 



loi. Myiarchus mexicanus cooperi* (Kaup) Baird. 

 Cooper's Flycatcher. — Thi.s large Myiarchus which, as I 

 hitely announced, t Mr. Stephens has the credit of first finding 

 within our lioundaries, was ascertained to he a common summer 

 resident ahout Camp Lowell. Of its occurrence in New 

 Mexico, also, 1 now have positive evidence, a previously unde- 

 termined specimen, taken by Mr. Stephens near the Gila River, 

 June 12. 1S76, proving on comparison to l)e identical witli 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. cineresccns^ wdiile 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 positivelv identified. The nest 

 was in an old Woodpecker's liole in a giant cactus about eighteen 

 feet from the groiuid. It was lined with soft, downv weed-seeds, 

 and contained two young just hatched and an addled egg." The 

 ^'g^i unfortunately, is so badly broken that accurate measurements 

 are impossible, but an approximation would be 1.04X.74. In 

 ground-color and markings it closely resembles eggs of M. crln- 

 itns^ the shell being a cUdl clayey-bufi' over which are numerous 

 longitudinal lines and dashes of purplish-brown or lavender. 



* The que.stion of the relationship which M. cooperi, M. erythrocercus, M. mexicantcs 

 and Af. crinitiis 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, p. 139; and ibid., Vol. 3, pp. 13-15.) While I cannot claim to have personally in- 

 vestigated the points at issue, I am at present inclined to follow Mr. Ridgway's ruling, 

 at least so far as M. coopcii is concerned. 



tThis Bulletin, Vol. VI, p. 252. 



