334 [April, 



hairs of the tail annulated except at the tip with chestnut and black, like the 

 back. Head and body 9 inches. Tail vertebras 4i inches. To tip of hairs 6 

 inches. 

 Collected by Dr. Suckley at Steilacoom, Paget Sound. Gov. 1. 1. Stevens. 



Tamias cooperi, Baird. Size rather above that of T. lysteri. Tail vertebrae 

 little more than half the length of the body. Ears large. 



Color. Anterior portion of the body above and sides grizzled gray and brown- 

 ish ash, somewhat as in the Norway rat, {Mas decumanus) with a slight dash of 

 rusty on the middle of the sides. Three distinct dorsal stripes of glossy dark 

 brown with two others (owe on either side) less strongly marked. The intervals 

 between these stripes light grayish. Under parts grayish white, the line of 

 separation from the sides very distinct. Hairs of the tail dark at the roots, then 

 rusty, then black, and tipped with grayish. Length of head and body 6 inches. 

 Tail vertebras 3 4-12ths inches ; to tip of hairs 4 inches. 



Collected on the eastern side of the Cascade Mountains, Washington Territory, 

 by Dr. J. G. Cooper. Gov. I. I. Stevens. 



Spermophtltjs gunnisoni, Baird. Smaller than S. ludoviciamts. Shape very 

 similar. Ears very short. Thumb with a well developed claw. Tail very short, 

 the vertebrae about one-ninth the length of the body. 



Color. Above light liver brown, mixed intimately with ash, light brown, and 

 black. Beneath pale yellowish brown. Tail white along the edge and tip, with 

 a sub-marginal band of black. The hairs at the extremity of the tail are en- 

 tirely white, except a narrow central band of black. Head and body 11 inches. 

 Tail vertebrae 1 3-l2ths inches; to end of hairs 1 ll-12ths inches. Hind foot, 

 from heel 1 10-12ths inches. 



Collected by Mr. Kreutzfeldt in the Cochitope Pass of Rocky Mountains. 



Lt. E. G. Beckwith. 



Spermopiiilus grammurus, Say. Specimens of this long lost species of Say 

 were collected by Capt. Pope, in Western Texas. 



Spermophilus beecheyi, Richardson. Specimens of this species were collected 

 in California by Dr. A. L. Heermann and by Lt. Trowbridge. 



Dipodomys montanus, Baird. Tail stout, rather longer than the body, with a 

 dusky stripe above and below, which extends to the end of the tail ; the hairs 

 springing from the extreme tip being, however, white. The white lateral stripes 

 reach to the end of the tail. A decided crest on the upper surface of the tail 

 towards its extremity. Body above yellowish brown, mixed with a good deal 

 of dusky. Head and body 4 inches. Tail vertebrae 5 3-l2ths inches ; to end 

 of hairs 6 4-12ths inches. 



Collected near Fort Massachusetts by Mr. Kreutzfeldt. Lt. E. G. Beckwith. 



Dipodomys agilis, Gambel.* Tail slender, much longer than the body, with a 

 moderate crest of erect hairs towards the tip, on both the upper and under sur- 

 faces. The terminal fourth or fifth of the tail uniformly dusky; the dark sub- 

 caudal stripe extending to the end of the tail without interruption. Body above 

 dusky, with only a slight tinge of yellowish brown on the sides. Head and body 



*Dr. Gambel described a Dipodomys under this name from Los Angeles, 

 but unfortunately omitted to mention any specific characters. Having re- 

 ceived specimens from this same locality, clearly referrible to D. philltpsii, I 

 was forced to consider Dr. Gambel's name as a synonym, his description apply- 

 ing as well to one as the other. I accordingly, in my notes, gave to the present 

 species the name of D. gambeli. As Dr. LeConte, in his masterly monograph 

 of the genus, ha? defined the same species with much precision under Dr. Gam- 

 bel's name, and is besides satisfied that it is really found at Los Angeles, with 

 the other, 1 have finally concluded it best to adopt the name of D. agilis, which, 

 however, is rather that of LeConte than Gambel. 



