124 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Lucas), 305 (crit.; Cape St. Lucas). Cooper, Orn. Cal., 1870, 302, 308, part 
(crit.; Cape St. Lucas). Barirp, Brewer, and Ripeway, Hist. N. Amer. 
Birds, IJ. 1874, 288-290, part (crit.; Cape St. Lucas). 
[Cyanurus] californicus Gray, Hand-list, pt. II. 1870, 4, no. 6,092, part. 
[Aphelocoma floridana] var. californica Cours, Key N. Amer. Birds, 1872, 166, part 
(Pacif. coast). 
Aphelocoma floridana, var. californica Cours, Check List, 1873, 49, no. 236 b, part. 
Aphelocoma californica (not Gurrulus californicus Vigors) Ripgway, Nom. N. Amer. 
Birds (Bull. U. S. Nat. Mus., no. 21), 1881, 30, no. 293, part; Proc. U.S. 
Nat. Mus., V. 1883, 541 (crit.; Lower Calif.). Brextpine, Jbid. (Cape 
Region); VI. 1885, 348 (Victoria Mts.). A. O. U., Check List, 1886, 242, 
243, no. 481, part. Saxvin and Gopman, Biol. Centr.-Amer., Aves, I. 1887, 
493, part (Cape St. Lucas). 
Aphelocoma floridana californica Cours, Check List, 2d ed., 1882, 67, no. 356, part. 
A.[phelocoma] californica hypoleuca Ripgway, Man. N. Amer. Birds, 1887, 356 
(orig. descr., “based on many specimens from Cape St. Lucas, La Paz, and 
contiguous localities ’’). 
Aphelocoma californica hypoleuca, A. O. U. ComM., Suppl. to Check List, 1889, 11; 
Check List, abridged ed., 1889, and 2d ed., 1895, no. 481 a. Bryanr, Proc. 
Calif. Acad. Sci., 2d ser., II. 1889, 24 (descr. nest and eggs from San Ignacio), 
293 (Cape Region and n. to 28°). Cours, Key N. Amer. Birds, 4th ed., 1894, 
901 (descr. ; vicinity of Cape St. Lucas). Benpire, Life Hist. N. Amer. Birds, 
pt. II. 1895, 378 (vicinity of Cape St. Lucas; descr. eggs taken by Xantus 
near Cape St. Lucas). 
[Aphelocoma californica] var. hypoleuca Dusois, Synop. Avium, fase. VII. 1901, 512 
(Basse Californie). 
The characters enumerated by Mr. Ridgway are fairly well maintained in 
the large series of specimens of Xantus’s Jay collected by Mr. Frazar, although 
none of them are quite constant. Asa rule, however, hypoleuca is considerably 
smaller than calzfornica, the bill is longer as well as stouter, the blue, espe- 
cially on the wings and tail, is much lighter, and the under parts are whiter. 
There is also usually more blue on the sides of the head, especially over the 
auriculars. 
Individual variations : — The blue of the head varies greatly in shade, rang- 
ing from marine blue to china blue. In some of the June specimens it is 
entirely worn off most of the feathers of the head, excepting those on the fore- 
head and sides of the crown, the remainder of the head above and on the sides 
being plain brown. The blue of the wings and tail is much less variable than 
that of the head. The brown of the back and scapulars is pale and grayish 
in some birds, in others deep and rich with a tinge of sepia. A few specimens 
have the scapulars and hind back strongly bluish: many show exceedingly 
faint dusky bars on the tail, as well as sometimes on the wing coverts. 
Juvenal plumage :— Male (No. 16,528, Triunfo, June 27, 1887). Upper 
parts, with the sides of the head and neck, plain, dull drab, tinged with plum- 
beous on the crown and forehead, with gray on the rump and upper tail 
coverts ; a short, inconspicuous, grayish stripe above the eye extending from 
