I 93-] Allen, Mammals from New Mexico and Durango. 599 



Young specimens in first pelage are gray brown, and young adults 

 are darker and more varied with blackish and less suffused with buff 

 than old adults. 



Represented by 20 specimens, collected as follows: Rosario, i 

 (young), Jan. 26; San Gabriel, 2, Feb. 18 and 20; Rancho Santuario, 

 2, Feb. 21 and 27; Rio Sestin, 15, April 9-17. 



Peromyscus paulus is a northern representative of the P. 

 musculus group, but is. very much smaller than either P. 

 musculus or P. m. brunneus, and differs widely from either in 

 coloration, being lighter or grayer above suffused with pinkish 

 buff instead of dark yellowish brown as in brunneus or tawny 

 as in musculus. It needs no comparison, however, with P. 

 taylori, which is still smaller, with smaller ears, shorter tail, 

 and different coloration. 



10. Peromyscus texanus flaccidus, subsp. nov. 



Type, No. 21064, $ ad., Rio Sestin (altitude, 7500 feet), northwest- 

 ern Durango, April 13; J. H. Batty. 



Similar to P. t. arizonce, but slightly paler and rather more fulvous, 

 and also larger with a relatively longer tail and shorter hind foot. 



Adult in April, upper parts dark fawn brown, darker over the me- 

 dian area, which is slightly varied with blackish, and lighter, clearer 

 fawn on the sides, defined abruptly against the white of the ventral 

 surface without an intervening fulvous lateral line; head paler and 

 grayer than the body, especially over the whole front of the head; 

 underparts clear white with plumbeous underfur; fore legs white to 

 the shoulder ; dark color of body extending narrowly down hind limb 

 to tarsal joint ; ears very thinly haired, dark gray brown, slightly mar- 

 gined with whitish; tail bicolor, thinly haired and with no very 

 appreciable pencil, the upper third dark brown, the rest grayish white. 



Young adults are dark grayish brown without tinge of fawn ; young 

 in first pelage are ashy gray varied with black, much lighter gray than 

 young of corresponding age of either arizonce or sonoriensis; ears black 

 with a fluffy whitish gray tuft at anterior base. 



Measurements. Type, total length, 177; head and body, 98; tail 

 vertebrae, 79; hind foot, without claws, 19, with claws, 20; ear, from 

 notch, 18, from crown in dry skin, 14. Twenty-one adults (13 males, 

 8 females) from Rio Sestin: Total length, 172.8 (159-184); head and 

 body, 95 (83-102); tail vertebrae, 77.3 (7089); hind foot, 19.3 (19 

 21); ear, 18.6 (17.5-19). 



Nineteen adults of P. t. arizonce, from Fairbank, Arizona, strictly 

 comparable as to season and age, average much smaller, having a total 



