1903.] Allen, Mammals from New Mexico and Durango. 609 



25. Lepus (Sylvilagus) durangae, sp. nov. 



Type, No. 21377, $ ad., Rancho Bailon (altitude, 7800 feet), north- 

 western Durango, May 12, 1903; J. H. Batty. 



Size of Lepus insolitus Allen, from the Plains of Colima, State of 

 Jalisco, but much less varied with black and the general coloration 

 much paler, except the nape patch, the legs and feet, which are of the 

 same deep rufous as in L. insolitus. In other respects the general 

 coloration is not distinctly different from that of L. arizona major 

 Mourns, collected at the same locality. From the latter it differs in 

 being twice as large (in general bulk), and from both L. insolitus and 

 L. a. major in important cranial characters. 



Measurements. Type, total length, 457 (as against 327 in L. a. 

 major}; head and body, 406; tail vertebrae, 51; hind foot (without 

 claws), 95; ear (from notch), 76. The type and two paratypes meas- 

 ure as follows: Total length, 436 (419-457) ; head and body, 387.6 

 (356-406); tail vertebrae, 55 (51-63); hind foot, 93 (89-95); ear, 76 

 (73-79)- Skull: Total length, 79 (as against 65 in L. a. major) ; basilar 

 length, 60; zygomatic breadth, 36.3 (as against 32 in L. a. major}', 

 length of nasals, 35; width of nasals posteriorly, 16; anteriorly ( = 

 width of rostrum), 9; alveolar length of upper toothrow, 13.3; length 

 of lower jaw, 55 ; height at condyle, 30 ; alveolar length of lower tooth- 

 row, 13.6. Skull similar in general contour to that of L. a. major, but 

 very much larger, with actually smaller audital bullae, which are hence 

 proportionally at least one third smaller. Skull much less massive 

 than that of L. insolitus, and so widely different in all details that no 

 comparison is necessary. 



Represented by three adult females, taken as follows: Rancho 

 Bailon, i specimen, May 7 ; Arroyo de Bucy, 2 specimens, May 12 

 and 20. 



This is a member of the Sylvilagus group, distinguished by 

 large size and important cranial characters, especially the 

 greatly reduced audital bullae. It is recorded by the collector 

 in his field notes as 'Mountain Rabbit,' the smaller L. a. 

 major, found with it, being called 'Mesquit Rabbit.' It is 

 about the size of L. aztecus Allen from Tehuantepec, which has 

 a much broader rostrum, and still smaller bullae, and is other- 

 wise quite different in cranial details. It is also rather smaller 

 and much darker in coloration. It is, perhaps, more closely 

 allied to this species than to L. insolitus. 



26. Canis impavidus, sp. nov. 



Type, No. 21266, $ ad.., Rio del Bocas (altitude, 7000 feet), north- 

 western Durango, Mexico, Feb. 13, 1903; J. H. Batty. 



[November i 1903.] 39 



