NO. 1121. riiOCEEDINOS OF THE NATIONAL MUSEUM. 721 



cus its skull is smaller, higher posteriorly, narrower and depressed 

 anteriorly. The audital bulhe are much less developed, and the incisive 

 foramina and interpterygoid fossa wider. The teeth are considerably 

 smaller. This species was taken on Tiburon Island hy my friend, Mr. 

 J. \\ . Mitchell, who accompanied Mr. McGee, of the Bureau of Eth- 

 nology, on his exploration in the region inhabited by the Seri Indians, 

 during the season of lS95-9(!. This insular form was evidently derived 

 IVom the Peroini/scHs eremlcn.s of the adjacent mainland, from which it 

 differs in being much smaller, with a daiker coloration, more hairy tail, 

 and in having certain cranial peculiarities. 



PEROMYSCUS STEPHENSI, new species. 

 PALM DESEKT MOITSE. 



T//^>r.— ^^o.(il()2(>,U.S.N.M. (Collection International Boundary Com- 

 mission). Adult female, skin and skull, from the lowest water, on the 

 wagon road, in a canyon, at the eastern base of the Coast Kange Moun- 

 tains, Sail Diego County, California, near the Mexican boundary line. 

 Collected by Doctor Edgar A. Mearns, May 9, 1891. Original number, 

 3ol2. 



DeHcriptioii of tjipe. — Similar externally to Peromi/.scus ereuiieus^ hut 

 smaller, with a longer tail and much paler coloration. Upper surface 

 grayish cream buff", deepening to a pale ochraceous butt' on sides and 

 rump; tail slightly dusky above, white below, hairy at end; feet and 

 under surface white; whiskers mostly colorless; ears and soles naked, 

 the Ibrmer slightly j)ubescent. Length, 193 mm.; tail vertebrae, 108 (to 

 end of hairs. 111); ear from crown, IG; ear from notch, 18.5; distance 

 between eyes, 8; diameter of eye, 3.8; length of longest whisker, 39; 

 from tip of nose to eye, 11.8; to center of pupil, 14; to ear, 20; to tip 

 of ear, 40; to occiput, 20.5; to end of outstretched hind lind), 125; fore 

 limb, measured from olecranon to end of longest claw, 21; length of 

 hand, 9.7; its longest claw, 1.4; hind limb, measured from knee-joint 

 to end of longest claw, 38; length of hind foot, 1'.); longest claw of 

 pes, 1.7. The skull is strongly depressed anteriorly, with the rostrum 

 produced and the nasals projecting. The zygomatic arches are incurved 

 and convergent anteriorly to meet the sloping zygomatic i)rocesses, this 

 feature recalling the configuration of young skulls of the other species 

 of Peroini/scHS in which the l)rain-case has outgrown the face, though 

 ill tliis case we have the opposite condition, the facial portion being 

 unusually elongated. ]Srame(l lor Mr. Frank Stephens, of California. 



NEOTOMA ATTWATERI, new species. 



ATTWA'l'Ell'S WOOD KAT. 



Do<;tor J. A. Allen recently sent me seven skins and five skulls of 

 what proves to be a new species of Neotoma, with permission to com- 

 pare them with the material in the United States National Museum 

 Proc. N. :\I. vol. xix 10 



