I 93-l Allen. Mammals from New Mexico and Durango. 605 



hind foot (without claws), 19.8 (19-22); ear from notch, 8.5 



(8-9-5). 



These specimens are rather grayer and paler than August 

 topotypes of P. nelsoni, but the difference is probably sea- 

 sonal. 



21. Liomys canus Merriam. 



Ten specimens, collected as follows: Rosario, 6 young 

 adults, Jan. 21-27; Ri Sestin, 4 adults, April 9-15. The 

 January specimens are uniform dark gray above, with a pale 

 yellowish lateral line; the April specimens are much paler 

 gray, some of which have a distinct lateral line, while in others 

 the line is obsolete. Two of the April specimens are beginning 

 to moult, in one of which the pelage of a large part of the 

 dorsal area has been renewed ; the new pelage is much darker 

 and mixed with fulvous, and closely resembles that of Sep- 

 tember topotypes of L. canus from Parral, Chihuahua, which 

 locality is only about fourteen miles north of Rosario. These 

 specimens are therefore almost topotypes of L. canus, but as 

 a series they differ so widely from late September specimens 

 of the latter that they might readily be mistaken for a different 

 species. The difference, however, is obviously seasonal, and 

 emphasizes the importance, in instituting comparisons be- 

 tween allied forms, of using material strictly comparable as to 

 season. Rarely, perhaps, is such a wide range of seasonal 

 variation met with as in the present species. 



Three adult males measure, respectively, as follows: Total 

 length, 244, 248, 252; head and body, 124, 130, 130; tail 

 vertebras, 114, 124, 122; hind foot (without claws), 31, 31.5, 

 31.5; ear (from notch), 17.5-18.3. 



22. Lepus (Macrotolagus) texianus micropus, subsp. nov. 



Type, No. 21251, $ ad., Rio del Bocas, northwestern Durango 

 (altitude, 6800 feet), Feb. 12; J. H. Batty. 



Similar to L. texianus eremicus Allen, and L. texianus griseus 

 Mearns, but more brownish gray than the latter, and larger bodied, 



