444 NEW MAMMALS FROM MEXICAN BORDER— MEARNS. vouxviii. 



ish instead of yellowish tips; ground-color of dorsum yellowish broccoli 

 brown, instead of tawny olive. Length, measured from nose to end of 

 caudal vertebrie, 325 mm.; tail vertebra?, 130; hind foot, 4:4. The den- 

 tition is relatively lighter than in mexicanus (typica), the ratio of the 

 length of the upper tooth-row to the basi-cranial axis being, in the two 

 forms, as 5 to G. The skull of mexicanus is relatively high and narrow, 

 with less spreading postorbital processes. The cranial measurements 

 of the two specimens compared are as follows : Total length, 48-13 mm. 

 (according to Hensel, 38-34.8); zygomatic breadth, 27-25; length of 

 upper tooth-row, 10.5-8; height of skull, 15-13; across postorbitals, 

 18-17.5; between orbits, 10.2-8.2; basi-cranial axis (combined lengths 

 of the basi-occipital and basi-sphenoid bones), 14.5-13.3. 



SPERMOPHILUS HARRISI SAXICOLUS, new subspecies. 

 EOCK SPERMOPHILE. 



Type.— No. 59869, U.S.KM. (Coll. International Boundary Commis- 

 sion). Adult female, from Tinajas Altas, Gila Mountains, Yuma County, 

 Arizona. Collected by Dr. E. A. Mearns and F. X. Holzner, February 

 17, 1894. Original number, 2983. Contained six large foetuses. 



Description of type. — Similar to S. harrisi, but much paler, with a 

 longer tail. Length, 245 mm.; tail vertebrte, 93; ear from crown, 5; 

 hind foot, 40. 



This is a long-tailed, pallid, desert race, inhabiting bare granite 

 ranges of mountains, extending in a southeasterly direction from the 

 Oila Eiver, in southwestern Arizona (Yuma County), into western 

 Sonora. 



iSpermophilus harrisi was described by Audubon and Bachman from 

 n specimen from an unknown locality. It now becomes exi)edient to 

 restrict the application of the name harrisi to the darker form, which 

 was found on the Mexican boundary line, from the Santa Cruz Valley 

 westward as far as the Sonoyta, where intergrades were taken at 

 Quitovaquito. The tail, m seven specimens of *S'. harrisi from Tucson, 

 Arizona, measured in the tiesh by Mr. P. L. Jouy, averaged 70 mm. in 

 length. 



LEPUS MERRIAMI, new species. 

 EIO GEANDE JACKRABBIT. 



Lepus texianus, Audubon and Bachman, N. Am. Quad., Ill, p. 156, pi. cxxxiii, 



.1853 (Texas). 

 Lepus caUoiis, Baird, Mamm. N. Aui., p. 590, 1857 (iu part only) ; U. S. and Mex. 



Bound. Surv., pp. 45 and 46, 1859 (in part only). — Allen, N. Am. Rodeutia, 



p. 350, 1877 ("Var. callotis," iu part). 



Type. — uS'o. 2317 (Coll. International Boundary Commission). Adult 

 female, from Fort Clark, Kinney County, Texas. Collected by Dr. 

 Mearns, April 6, 1893, Similar to L. ecdJotis, of Mexico, but with 

 shorter ears, which are black instead of white at the tip; and the upper 



