185V.] 



Q 333 



Sigmodon berlandiebi. Baird. Rather larger than <?. kispidus. Claws 

 weaker. Tail equal to or longer than the body. 



Color. Above grayish yellow-brown, lined with black. No trace of ferru- 



ginous 



Collected between San Antonio and El Paso, by Mr. Clark, and in Northern 

 Mexico, by Lt. Couch. 



Neoto.ma mexicana, Baird. Ears very large. Feet small. Tail three 

 fourths (?) the length of the body, covered with short stiff hair, so as to conceal 

 the annuli. Fur long and very soft. 



Color. Above light yellowish brown, lined with dark brown ; pale fulvous 

 on the sides. Feet and under surface of the body, white. Body and head 8 

 inches. Tail to end of vertebrae 5 inches, of hairs 3-12ths inches. Hind foot 

 1 l-12th inches. Collected near Chihuahua, by John Potts, Esq. 



Neotoma micropus, Baird. About the size of N. jloridana. Tail scarcely 

 two-thirds the length of the body. Sparsely coated with hairs. Skull much 

 broader and feet shorter than in N. floridana. 



Color. Above grayish slate ; feet and under parts white. Head and body 

 8 4-12ths inches. Hind feet 1 4i-12 inches. 



Collected at Charco Escondido and Santa Rosalio, Mexico, by Lieut. Couch. 



Characteristics of some New Species of North American Mammalia, collected 

 chiefly in connection with the U> S. Stirveys of a Railroad Route to the Pacific. 



By Spencer F. Baird.* 



PART I. 



Lepus Washingtonii, Baird. Size about that of L, sylvaticus, or a little 

 larger. Fur very soft and full on the body and under surface of feet. Tail very 

 short. Ears shorter than the head. Hind foot, measured from the heel, longer 

 than the head almost by the length of the claws. 



Color. Back, sides and throat reddish brown, the former with many glossy 

 black hairs. Tail lead-colored above; rusty white beneath. Abdomen pure 

 white. Ears black on the posterior margin and tip of their inner (convex) sur- 

 face, the remainder of which is pale reddish brown, except on the exterior band. 

 No change to white in winter. Head and body 18j inches. Tail vertebras 8 

 lines. Ears 3 3-12ths inches. Hind foot 4 inches. 



Collected at Puget Sound and Shoalwater Bay by Dr. Geo. Suckley, TJ. S. A., 

 and Dr. J. G. Cooper. Survey of Northern Route, Gov. I. I. Stevens. 



Lepus trowbridgii, Baird. But little larger than Lepns artemisice. Head 

 small ; ears about equal to it in length, broad and ovate. Tail very small. Hind 

 feet very short, densely padded, and about the length of the head. 



Color. Above yellowish brown and dark brown mixed ; beneath grayish lead 

 color. The sides differ from the back only in being a little paler. Back of neck 

 pale rusty. Ears grayish and black on the external band, ashy gray elsewhere ; 

 with but slight indication of a darker margin or tip. Head and body 13 inches. 

 Tail to end of vertebrae 5 lines. Ears 2 4-12ths inches. Hind foot, from heel, 

 2 8-12ths inches. 



Hah Coast of California, from Monterey to Bodega. Collected by Lt. W. 

 P. Trowbridge, U. S. A. Lt. A. W. Whipple, U. S. A. 



Sciurus suckleyi, Baird. Larger than ?. hudsonius. Tail much shorter than 

 the body, very fiat. Ears tufted. Under surface of the feet densely clothed 

 with hairs to the bases of the toes. Fur full and soft. 



Color. Above mixed chestnut brown and black ; beneath pale brownish rusty; 

 the hairs on the belly obscurely annulated with black. A dusky line along the 

 flanks. Tail black at the extremity ; margined throughout with rusty white ; the 



*Full descriptions of these species will shortly appear in the official reports of 

 the Railroad Surveys. 



26 



