34 
BrewstkR on a Collection of Arizona Birds. 
[January 
Sexes similar. 
Habitat. Arizona; New Mexico'; east to Western Texas (El Paso). 
Table lands of Mexico. 
Callipepla squamata castanogastris var. nov. Chestnut-bellied 
Scaled Quail. 
Ch. Sp. $ similis C. squamatae , sed colore in toto magis plumbeo; 
capitis lateribus et vertice obscurioribus ; macula ferrugineo-castanea in 
abdomine. $ dissimilis, pallidior ac sine macula castanea. 
Adult $ (No. 6547 — collector’s No. 1640 — Rio Grande City. Texas, 
November 11, 1880. M. A. Frazar). Entire upper parts, with sides of 
head, and a broad space across breast, deep bluish-cinereous, tinged with 
olive on the back, wings, and crown ; throat deep buff, in marked contrast 
with the bluish of cheeks and breast; under tail-coverts and crissum ji 
warm brownish-cinnamon ; abdomen pale brownish-orange, with a broad, 
elongate, central patch of dark rusty-chestnut; otherwise with the mark- 
ings as in C. squamata. 
Adult $ (No. 6546 — collector’s No. 1655 — Rio Grande City, Texas,, I 
November 16, 1880. M. A. Frazar). Paler beneath than the $ , and !j 
without any trace of the abdominal chestnut patch. 
Habitat. Valley of the Lower Rio Grande in Texas ; Eastern Mexico 
(New Leon). 
The prominent differential characters of these two races may be more 
briefly given as follows : — 
C. squamata. — General coloring pale and faded ; crown and sides of 
head scarcely darker than throat, and rarely with any bluish tinge; no 
decided chestnut patch on abdomen ; sexes similar. 
C. squamata castanogastris. — General coloring deep and rich; crown 
concolor with back, and cheeks with breast, — both very much darker than 
throat; abdomen with a conspicuous central patch of solid rusty-chestnut; 
sexes dissimilar, the $ lacking the abdominal chestnut patch, and being 
much lighter colored than the $ . 
The individual and geographical variation shown by my series of 
eighteen specimens of C. squamata proper, is comparatively slight' 
New Mexican examples seem to be a trifle bluer than Arizona ones, and 
autumnal birds from both Territories are richer-colored than those taken in 
spring and summer; but all are very much paler than my types of C. cas- 
tanogastris , while in none of them is there any decided chestnut patch 
beneath, the nearest approaches showing only a slight rusty tipping on 
a few of the feathers. I have not been able to examine as large a number 
of the Texas form, but Mr. Frazar. who has shot upwards of a hundred in 
the valley of the Lower Rio Grande, assures me that the adult male never 
lacks this conspicuous feature. The material in the National Museum, 
which Mr. Ridgway has kindly placed at my disposal, fully bears out the 
above generalizations. 
The following specimens of C. squamata were collected by Mr. Stephens 
during his late trip. 
6318, $ ad., Camp Bowie. January 10. Length, 10.60; extent. 14.80; 
wing, 4.53; culmen. .63. 
