yo Brewster on Birds from Arizona and New Mexico. 
Dhnensions. “Length,. 10.20; stretch, 19.40” (collector’s 
measurements); wing, 6.65 ; tail, 4.45 ; tarsus, .73; longest ric- 
tal bristle, 1.80. 
Habitat. Chiracahua Mountains, Arizona. 
The differential characters presented by this specimen, are, in 
my opinion, well worthy of varietal recognition. My collection 
embraces a very good suite of eastern specimens of vociferus , 
and among them I find no decided approaches to the Arizona bird. 
The white on the tail, although somewhat variable in extent, is 
never limited to so small an area, and the rictal bristles are inva- 
riably much shorter. Nor have I seen any eastern males with the 
gular collar uniformly ochraceous, even autumnal examples hav- 
ing the white largely predominating over this space. The dif- 
ference in size also is very considerable. Taking the wing as the 
best exponent of this, the wing of arizonce gives 6.65, while 
seven males of vociferus measure respectively 5.80 ; 5.80 ; 5.83 ; 
5.96; 6.20; 6.21; 6.40. 
I am indebted to my friend Mr Ridgway, for an opportunity of 
examining a male and female of the Mexican species A. ma- 
cromystax , from the collection of the National Museum. These 
specimens differ so widely from my arizonce that a comparison 
between them and the latter, is scarcely necessary. Arizonce 
has the white of the tail deepest on the inner feathers and decreas- 
ing in extent towards the outer pair, precisely as with vociferus ; 
while in macromystax the white areas decrease very rapidly in- 
wards, the third pair of rectrices being barely tipped with that 
color. Furthermore, macromystax has the bill longer and much 
more compressed ; the nostrils larger and more prominent ; the 
rictal bristles thicker ; the feet and tarsi stouter, and dull orange 
in color ; the general plumage much darker ; the under parts with 
broad but sparsely scattered blotches of fulvous white ; and the 
decided abdominal zone of light color wanting. 
With the pair of A. macromystax Mr. Ridgway also sends me 
four examples of vociferus , from Mexico and Gautemala. Only 
one of these bears any date (Tehuantepec City, Nov. 2, 1869), 
but two of the others are apparently winter specimens also, and 
as all three agree perfectly with my autumnal specimens of voci- 
ferus taken in New England, I regard them as winter visitors 
from the eastern United States. The fourth, however, (No. 
74,355, National Museum) from Guanajuato, Mexico, shows an 
