1911] Taijlor: Mammals of the 1909 Nevada Expedition. 291 



8265, Big Creek Ranch, June 12, had evidently recently given 

 birth to young, as the mammary glands were functioning. These 

 facts show that there are no precise limits to the mating, gesta- 

 tion and suckling periods. 



Lepus calif ornicus wallawalla C. H. ]\lerriam ( ?). 

 Washington Jack Rabbit. 



Status. — It is rather difficult to determine definitely the exact 

 status of our specimens from Quinn River Crossing and Virgin 

 Valley. The reason for the difficulty lies in the probability of 

 their being intergrades between Lepus c. deserticola and Lepiis 

 c. wallawalla. Our specimens are somewhat darker dorsally than 

 deserticola from the Mohave and Colorado deserts. All of them 

 have the distal black area on the posterior surface of the ears 

 very definitely developed. The skulls have smaller bullae, and 

 narrower jugals. The rounding of the skull, however, is not 

 appreciably greater than in typical deserticola, and in the matter 

 of measurements our series is a little closer to deserticola than to 

 icallawalla. 



Thus Nelson's statement (1909, p. 189) to the effect that in 

 northwestern Nevada deserticola grades into the closely related 

 wallawalla, is borne out by a study of our material. A female 

 specimen (no. 8279) from Virgin Valley seems to be nearer the 

 description of irallawalla than any of the others of the series. 



Reference to Nelson's map of the distribution of the jack 

 rabbits of the Lepus calif ornicits group (1909, p. 127) will show 

 that the specimens collected by us come from a locality between 

 the plotted ranges of Lepus calif ornicus wallawalla and Lepus 

 redif ornicus deserticola. As far as I can see the resemblance to 

 wallawalla is more pronounced than to deserticola, and so our 

 series is referred to that form. A corresponding intergradation 

 between Sylvilagus nuttalli nuttalli and »S*. n. grangeri was found 

 })y us in this same region (see above). 



Distribution. — The jack rabbit was observed at Winnemucca, 

 Amos, Tregaskis Well, Quinn River Crossing, Big Creek and 

 Alder Creek Ranches, and on Leonard Creek. 



Specimens were collected as follows : Quinn River Crossing 

 (4100 feet), i; Virgin Valley (5000 feet), 2. They were seen 



