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



24. Lepus (Sylvilagus) arizonae major M 'earns. 



Seventeen specimens, all but 4 adult, collected as follows: 

 Matalotes, i, March 20; Rancho Ballon, 16, May 512. 



Five males measure : Total length, 355 (346 372); head and 

 body, 312 (298-324); tail vertebrae, 43 (32-50); hind foot 

 (without claws), 74 (70-76); ear from notch, 69.3 (69-70); 

 9 females, total length, 365 (344-388); head and 1 body, 327 

 (308-343); tail vertebra, 43.7 (38-50); hind foot (without 

 claws), 74 (7076); ear from notch, 68 (63.570). 



According to the measurements taken from the fresh speci- 

 mens by the collector, who collected and measured both series, 

 the Durango specimens slightly exceed those from southern 

 New Mexico (L. a. minor, from near El Paso, Texas) in all the 

 measurements except that of the hind foot, which falls a little 

 below that of the New Mexico series. The Durango specimens 

 are very much paler, being less varied with black, and having 

 the brownish tint of the ground color much paler. Owing to 

 the larger size of the Durango specimens, they are referred to 

 Mearns's subspecies major. The smaller size of the hind foot 

 is paralleled in the Lepus texianus series from the same two 

 regions. The measurements may be thus tabulated for com- 

 parison : 



L. a. minor: 12 males, total length, 343; tail vertebras, 40; hind 

 foot, 77 ; ear, 65.4. 



L. a. major: 5 males, total length, 355; tail vertebrae, 43; hind foot, 

 74, ear, 69.3. 



L. a. minor: 10 females, total length, 347; tail vertebrae, 41; hind 

 foot, 76; ear, 66. 



L. a. major: 9 females, total length, 365; tail vertebrae,' 43.7; hind 

 foot, 74; ear, 68. 



As the minor series was taken in December, and the major 

 series in May, it is possible that the average may be affected 

 by the fact that the December series may contain some ' young 

 adults ' which by the following May would have increased in 

 size ; but the improbability that this is the cause of the differ- 

 ence in average size is shown by comparison of the maxima of 

 the two series, which differ correspondingly with the averages. 



