600 APPENDIX. 
(54.) Page 356, after A. californica: 
481b. Aphelocoma californica obscura AnTHony. Belding’s Jay.’ 
Similar to A. californica, but rather smaller and decidedly darker, the back 
dark drab or brownish slate, the under parts more decidedly grayish and under 
tail-coverts more strongly tinged with blue. Hab. San Pedro Mountains, Lower 
California. 
(55.) Page 366, Dolichonyx oryzivorus albinucha: 
This supposed form is probably not valid, having been based upon breeding 
males in which the color of the hind-neck, etc, was bleached. 
(56.) Page 367, Genus MOLOTHRUS SWAINSON. 
Section a?, including M. wneus (Wact.), should constitute a distinct genus, 
Callothrus Cassin (Pr. Ac. Nat. Sci. Phil. 1866, 18, type, Psarocolius wneus 
Waat.), the characters of which are as follows:—Feathers of hind-part and 
sides of neck in the adult male much elongated, forming a very conspicuous, 
soft, and dense erectile ruff; four outer primaries with inner webs curiously 
sinuated and emarginated, the web being expanded just beyond the middle 
portion, the posterior extremity of the widened part forming an acute point, 
projected longitudinally (less marked on the first quill). Two apparently dis- 
tinct species constitute the genus, their distinctive characters being much more 
obvious in the females than in the males. They may be thus characterized : 
b'. Bill decidedly stouter; adult female grayish brown (washed with plumbeous 
in fresh plumage), lighter below, the feathers of back, ete., darker medi- 
ally, producing more or less conspicuous streaks; adult male brighter 
colored, with the bronze of head, neck, etc,, more greenish (scarcely, if 
at all, duller on top of head than on back), and rump distinctly purple 
or violet. Hab. Western Mexico (Mazatlan, Manzanillo Bay, Colima, etc.). 
C. eneus (WAGL.). Bronzed Cowbird. 
b?, Bill more slender; adult female dull black, more or less glossed with bluish 
or purple, especially on wings and tail; adult male duller in color, with 
bronze less greenish (decidedly duller on top of head than on back), and 
with rump dull bronzy scarcely, if at all, mixed or tinged with purplish 
or violet. Hab. Eastern and southern Mexico, Yucatan, and south to 
Panama; north to lower Rio Grande Valley in Texas. 
496. C. robustus (Caz.). Red-eyed Cowbird.’ 
1 Aphelocoma californica obscura ANTHONY, Proc. Cal. Ac. Sci. 2d ser. ii. Oct. 11, 1889, 75. 
2 Molothrus robustus Caz., Mus. Hein. i. Sept. 1851, 193, foot-note (Mexico). 
This is based on the adult female of the eastern bird. The description of Psarocolius eneus WAGL. agrees 
minutely with the adult male of the western form; and therefore, while the locality given is simply “ Mexico,” 
I have preferred to restrict the name as above, rather than give a new name to the western species, which 
would be the necessary alternative. The two species are essentially identical in all measurements except of the 
bill, which is considerably stouter in C. eneus. 
