1893.] Zoology. 855 
Up to the present time no Onychomys has been recorded from Cali. 
fornia that I am aware of. Dr. Merriam informs me a large series was 
taken there by the Death Valley Expedition, but owing to the delay in 
the publication of the second part of the report on the expedition this 
material was, of course, unavailable in the present connection. 
The American Museum of Natural History has no specimens of Ony- 
chomys from California. Two winter specimens from Dulzura, San 
Diego Co., Cal., were loaned by Mr. Miller. They are unaccompanied 
by other data, or measurements, or skulls, and so were not included in 
the above diagnosis. They differ from the type of ramona in appar- 
ently smaller size and darker dorsal shade, in which respects they more 
closely resemble two October specimens of ramona. It may be re- 
marked that this peculiar dorsal shading is also characteristic of the 
majority of Dulzura Sitomys and Reithrodontomys I have examined, 
as compared with the same species from San Bernardino Valley, but it 
is not sufficient to warrant special recognition in any case. 
One half-grown and one young—adult specimen of ramona entirely 
lack the characteristic colors of upper parts in fully adult specimens, 
being of a uniform pale steel-gray above. The same striking differ- 
ence, due to age, is very noticeable in a series of Sitomys and Perog- 
nathus taken in the same region. 
4. Reithrodontomys pallidus Sp. nov. (Type No.3232, 9, Col. Amer. 
Mus. Nat. History, Santa Ysabel, Cal., March, 12, 1890, col. by F. 
Stephens). ; 
Description—Smaller and lighter colored than R. longicaudus. 
Colors of upper parts tawny or buffy gray, much lighter than that of 
Mus musculus. Median dorsal area darker than sides and face, the 
latter being washed with ochraceous, that color becoming purer on 
cheeks and lateral lines of belly. Belly white, with light plumbeous 
cast from exposed bases of hairs. Small ventral spot and space between 
fore-legs, tinged with buff. Chin and throat white. Tail of same rel- 
ative length as longicaudus, but much more finely haired and annulated, 
and more slender and distinctly bicolor as in corresponding parts of 
body. Ears relatively larger than in longicaudus, lighter colored and 
with a fulvous spot at their anterior bases. Feet pure white. 
. Measurements.— Total length, 137 ; tail, 73; hind foot, 16. Skull— 
. total length, 19.2; basilar length, 14.6; zygomatic breadth, 10.2; 
length of nasals, 7.1; interorbital constriction, 3. 
Only one specimen of this mouse was secured at San Bernardino. 
Mr. Herron reports them very rare while longicauda seems to be 
abundant near its type locality about San Francisco. 
