CLASS I. MAMMALIA: ORDEB 7. RODENTIA. 417 
THE CAMAS HAT, OE GOPHER. 
The Reddish Pouched-Rat, P. fulvus^ is of a light reddish-brown above and whitish beneath. 
Its length is five inches, and is found in the western parts of New Mexico. 
The Chestnut-cheeked Pouched-Rat, P. castanops, is of a pale yellowish-brown, is eight 
inches long, and is found on the southwestern prairies. 
The P. hispidum is of a reddish-brown color, eleven inches and a half long, and is found in 
Mexico. 
Leadbeater's Sand-Rat, P. umbrinus, is of an amber-brown above, and gray beneath; it is 
seven inches long, and is found in Louisiana. 
The Mexican Pouched-Rat, P. Mexicanus, noticed by Gervais, as already mentioned, is eleven 
inches long, with shiny hair of a cinereous blackish color. 
THE SEWELLEL. 
To this list we may add the Tuet-tailed Pouohed-Rat, the Perognathns 'penicillatus of 
Woodhouse, which is three and a half inches long, wnth a tail a trifle longer. It is found in New 
Mexico. The Saccophorus Bottce, mentioned by Gervais, is probably the same as the Geomys 
rufescens of Leconte. 
Vol. I.— 63 
