606 Bulletin American Museum of Natural History. [Vol. XIX, 



with shorter tail, smaller hind feet, and larger ears than either, and 

 with less fulvous along the Sides of the body ; * prepectoral area paler 

 and more grayish. 



Measurements. Type, total length, 535; head and body, 459; tail 

 vertebrae, 76; hind foot, 114; ear from notch, 133; ear from crown, 



175- 



Represented by 1 9 specimens (8. males and 1 1 females) , collected as 

 follows: Rancho Santuario, i, Feb. 2; Rio del B ocas, 5, Feb. 912; 

 Rio Sestin, i, April 18; Rancho Bailon, 12, May 5-13. As usual in 

 the species of Lepus, the males are considerably smaller than the 

 females, as shown by the following measurements, which include the 

 whole Durango series: 



Eight males: Total length, 564 (535-587) ; head and body, 493 (459- 

 514); tail vertebras, 71 (64-83); hind foot, 116 (108-127); ear (from 

 notch), 136.4 (133-146). 



Eleven females: Total length, 599 (559-626; only i below 578, and 

 only 2 above 610); head and body, 524 (483-546); tail vertebrae, 73.7 

 (64-89); hind foot (without claws), 118 (108-124); ear (from notch) 

 137 (130-145; only i above 140). 



This subspecies may be best compared with L. texianus 

 griseus of Mearns, the type locality of which is Fort'Hancock, 

 El Paso County, Texas, inasmuch as I have a large series of 

 this form from the southern border of New Mexico, taken near 

 El Paso, collected and measured by Mr. Batty, and thus 

 strictly comparable in measurements with his series of Du- 

 rango specimens here under consideration. According to the 

 same collector's measurements, 10 females of griseus have a 

 head and body length of 460 as against 599 for n females of 

 micro pus; tail vertebrae 82 in griseus as against 74 in micro pus; 

 the hind foot 128 as against 1 18 in micropus; and the ear from 

 notch 130 in griseus as against 137 in micropus. 



Some of the May specimens are in worn pelage, but the 

 coloration, in general effect, differs but little from that of the 

 February specimens. The wearing away of the light tips to 

 the hairs leaves the back darker, and the fulvous of the 

 prepectoral area is duller and grayer, or less fulvous. 



This form needs no comparison with Lepus asellus Miller, 

 from San Luis Potosi, which belongs to the group with black 

 at the base of the ears, of which there is no trace in the 

 texianus group. 



