1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 445 



surface of the body inclines to grayish fawn-color rather than ochra- 

 ceons buff. 



This is the common " Jackrabbif of the Kio Grande. It has been 

 described by Audubon and Bachman, Baird, Allen, and other writers, 

 under the preoccupied names of c«7?of/s and texianits, with which species 

 it has been confounded. 



PEROMYSCUS CANUS, new species. 

 TEXAS GRAY MOUSE. 



Ty2)e. — No. fHyf? U.S.^NT.M. (Coll. International Boundary Commis- 

 sion). Adult female, from Fort Clark, Kinney County, Texas. Col- 

 lected by Dr. Mearns, January 13, 1803. Original number, 2208. 



Description of fype.—Ahove, drab gray, with a dark vertebral area, 

 where the pelage is more thickly lined with black. Feet and under 

 parts pure white; tail bicolored, blackish above, white below; ears 

 and tail well clothed with hair; soles of feet densely pilose posteriorly; 

 skull narrow, slender, and rectangular, with the brain-case low and 

 elongated and the rostral portion long. Length, 175 mm.; tail vertebrte, 

 75; ear from crown, 11.5 (small); hind foot, 21. Teats, J5^. 



BemarJcs, — This mouse is quite similar in size and coloration to Pero- 

 myscus mearnsil, Allen, from which it may be readily distinguished by 

 its smaller, more hairy, ears, and its much shorter, more hairy, and 

 sharply bicolored tail, as well as by its longer fur at all seasons. The 

 skull of P. mearnsii is smaller, and has a more swollen brain-case, 

 shorter and more depressed rostrum, and shorter pterygoid fossa. 

 Perhaps the dentition is also a little heavier. Compared with F. 

 leucopns, the skull is lower and more slender, with a corresponding 

 shortening of the brain- case, pterygoid fossa, and rostrum. Peromyscus 

 texanus, a very distinct species, occurs with P. canus in portions of its 

 range. 



PEROMYSCUS TORNILLO, new species. 

 TORNILLO MOUSE. 



Type. — No. IHIf, U.S.K.M. (Coll. International Boundary Commis- 

 sion). Adult male, from the Rio Grande, about 6 miles above El Paso, 

 Texas. Collected by Edgar A. Mearns and Frank X. Holzuer, February 

 18, 1892. Original number, 1158. 



description of type. — Upper parts light broccoli brown; ears and 

 upper side of tail hair brown; feet and under parts pure white; body 

 stout; ears and tail well haired, the latter sharply bicolored; soles 

 densely pilose jmsteriorly. Length, 102 mm.; tail vertebrae, 90; ear 

 above crown, 12; hind foot, 23. 



The skull of this mouse is at once distinguished from all other Texan 

 mice of this genus by its larger size. The animal bears superficial 

 resemblance to the P. arizomv, recently described by Dr. J. A. Allen, 



