New Mice from Mexico and Guatemala. 121 



hind foot 28. Average of 10 specimens from type locality : Total length 

 254 ; tail vertebra 130; hind foot 28.6. 



Remarks. This animal is only a mountain form of mexicanus, which it 

 closely resembles. It differs far more from the geographically nearer 

 mexicanus orizabze than from true mexicanus. 



Peromyscus mexicanus saxatilis subsp. nov. 



Type from Jacaltenango, Huelmetenango, Guatemala. No. 77296, $ 

 ad., U. S. Nat. Mus., Biological Survey Coll. Collected Dec. 19, 1895, by 

 E. W. Nelson and E. A. Goldman. Orig. No. 8824. 



Characters. Similar to P. mexicanus, but paler, upper parts more dis 

 tinctly lined with black hairs, under parts whiter. 



Color. Upper parts grayish fulvous (in some specimens fulvous), every 

 where conspicuously lined with black hairs, which on middle of back 

 form a distinctly darker area; cheeks and sides fulvous, usually pale; 

 face between eyes grayish, slightly tinged with pale fulvous and grizzled 

 by dark hairs ; end of nose (except whitish tip), patch at base of whiskers, 

 and narrow ring round eye blackish ; under parts, including lips, wrists, 

 and fore feet, white; ankles dusky; hind feet white; tail dusky above, 

 irregularly whitish or yellowish below. 



Cranial characters. Skull like that of mexicanus, but with even less dis 

 tinct supraorbital beads, smaller incisive foramina, and smaller molars. 



Measurements. Type specimen: Total length 238; tail vertebra 122; hind 

 foot 27.5. Average of 10 specimens from type locality : Total length 245.5 ; 

 tail vertebrae 127.5; hind foot 27.5. 



Peromyscus mexicanus orizabae subsp. nov. 



Type from Orizaba, Vera Cruz, Mexico (alt. 4200 ft.). No. 58197, 

 tf ad., U. S. Nat. Mus., Biological Survey Coll. Collected Jan. 29, 1894, 

 by E. W. Nelson and E. A. Goldman. Orig. No. 5787. 



Characters. Size medium ; ears large and nearly naked ; tail long and 

 nearly naked ; coloration dark. Skull with broadly spreading zygomata. 

 Similar to P. mexicanus, but differing in slightly larger size, decidedly 

 longer tail and hind feet, slightly more white on hind feet, and decidedly 

 more spreading zygomata. 



Color. Upper parts : top of head and back dusky seal-brown from in 

 timate mixture of black and chestnut, the black predominating and shad 

 ing into dull chestnut- fulvous on sides ar.d cheeks ; top and sides of nose 

 and ring round eye dusky ; underparts, including lips, wrists, and fore 

 feet, white; ankles dusky; hind feet whitish, clouded basally with dusky ; 

 a pale salmon suffusion on pectoral region, sometimes extending over 

 breast ; tail dusky above, irregularly whitish or yellowish below. 



Cranial characters. Skull like that of mexicanus, but zygomata decidedly 

 stronger, more squarely and widely spreading anteriorly, and more deeply 

 notched by anteorbital slits ; the vertical lamina on outer side of slit 

 much more prominent. 



Measurements. Type specimen: Total length 257; tail vertebra 139; 



