Brewster on a Collection of Arizona Birds. 1 39 
40. Geothlypis macgillivrayi ( And .) Baird. Macgilli- 
vray’s Warbler. — Two specimens collected at Tucson (9 
April 20, $ June 8). • ‘I have not found it common in either 
Arizona or New Mexico.” 
41. Geothlypis trichas (Linn.) Caban. Maryland 
Yellow-throat. — Mr. Stephens found this species “abun- 
dant along streams,” an experience at variance with that record- 
ed by Mr. Henshaw, who met with it but twice while in 
Arizona. 
The only specimen taken agrees closely with some examples from the 
Truckee River, Nevada, and differs from my eastern representatives, in 
having the upper parts yellowish-olive instead of olive-green; the crown- 
band much broader and creamy white in color; the wings and tail longer; 
the yellow beneath richer, and extending more over the abdomen. Mr. 
Ridgway has already called attention* to some of these differences which, 
as he now writes me, would be enough to warrant the varietal separation 
of the western bird, were it not that specimens from both sections of the 
country occasionally vary in such a manner as to invalidate any charac- 
ters that could at present be proposed. With the acquisition of better 
series, however, it is probable that the representatives of two regions, as 
yet undefined, will be found to present sufficiently constant characteristics 
to deserve distinctive names. 
219, $ ad., Cienega Station, April 17. Length, 5.40; extent, 6.90; 
wing, 2.16; tail, 2.40; culmen, .55, “Iris brown ; bill black, bluish be- 
neath; legs pale brown.” 
42. Icteria virens longicauda (Lawr.) Cones. Long- 
tailed Chat. — This bird was observed only in the vicinity of 
Tucson. The first specimen was taken April 30, and it soon 
afterwards became abundant. 
310. $ ad., Tucson, April 30. Length, 7.50; extent, 9.40; wing, 3.12; 
tail, 3.52. “Bill and legs black.” 
318, $ ad., Tucson, May 3. Length. 7.70; extent, 9.60; wing, 3.05; 
tail, 3.61. 
335 ? $ ad., Tucson. May 5. Length; 7.30; extent, 9.70; wing, 3.12; 
tail, 3.45. 
521, $ ad., Tucson, June n. -Length, 7.10; extent, 9.40; wing, 3.15; 
tail, 3.36. 
43. Myiodioctes pusilius pileolatus (Ball.) Ridgw. 
PlLEOLATED WARBLER. 
Although Mr. Henshaw referred all his Arizona Black-capped Flycatch- 
ers to pusilius, mine are absolutely typical of pileolatus; in fact they are 
brighter than some specimens from Nicasio (California), the yellow below 
being richer, and the upper surface more yellowish, while the bill is equally 
* Hist. N. A. Birds, Vol. I, 1874, pp. 297-298. 
