518 U. S. P. R. R. EXP. AND SURVEYS — ZOOLOGY GENERAL REPORT. 
List of specimens. 
Catal. No. 
Sex. 
Locality. 
When collected. 
Whence obtained. 
Orig. No. 
Collected by — 
6744 
6745 
6742 
5559 
4943 
5970 1 
5968 
5967 
6746 
3710 
6743 
3911 
R. D. Cutts 
do 

<? 
April — , 1856... 
E. Samuels 
653 
4 
Santa Clara, Cal 
Gov. Stevens 
Dr. Cooper.. 
do 
$ 
9 
3 
Lt. Williamson 
Dr. Heermann 
June 22, 184S... 
Dr. Heermann 
California 
Dr. Heermann 
1 Length, 9. 00 ; extent, 12. 50 ; iris, reddish brown. 
PIPILO MESOLEUCUS, Baird, 
Pipilo mesoleucus, Baied, Pr. A. N. Sc Ph. VII, June, 1854, 119. (Rocky Mountains.) 
Sp. Ch. — Above olivaceous brown, with a grayish tinge ; hood dull chestnut, conspicuously different from the back. Sides 
beyond the edge of the wing like the back, but paler ; posteriorly, and about the vent and under tail coverts, pale brownish red. 
The ashy olive brown of the sides scarcely meeting across the breast, the lower portion of which, with the upper belly, is rather 
pure white. The chin, throat, and upper part of the breast pale yellowish rufous, spotted on the fides and across the breast 
with brown ; an obscure spot in the middle of the breast ; edge of outer primary white. 
Length, 8. 50 inches ; wing, 3. 80 ; tail, 4. 70. 
Bab. — Valley of upper Rio Grande and across to the Gila river East to Santa Caterina, New Leon. 
This species is similar in general appearance to the P./uscus, but the olive brown and rufous 
are both of a lighter shade. The crown is of a decided chestnut, conspicuously different from 
the back, instead of nearly the same tint. The light reddish under the head is wider throughout 
and extends down to the upper part of the breast, blending with the colors of the breast and 
belly, instead of being narrower, more sharply defined, and restricted to the chin and throat. 
The isolated larger spot on the breast is more conspicuous ; the breast and belly are quite pure 
white, shaded with obsolete brownish blotches, instead of being uniform grayish brown, with 
only an approach to whitish in the very middle. The edges of the wing and tail feathers are 
a good deal lighter, the outer web of the first primary being sharply edged with pure white, 
instead of obscure grayish brown. The size generally is rather smaller. 
