112 



PROCEEDINGS OP THE NATIONAL MUSEUM 



VOL. S3 



Upper Pliocene lagomorphs are relatively little known, and hereto- 

 fore the occurrence of these forms in the Idaho beds has not been 

 recorded. The number of species here recognized is noteworthy, a 

 diversity approaching that of the rabbits and hares now living in 

 southern Idaho. The recent fauna in the vicinity of Hagerman 

 includes the white-tailed and black-tailed jack rabbits {Lcpus town- 

 sendii townsendii and L. calif ornictts deserticola) , the sage cottontail 

 {Sylvilagus nuttalli grangeri) , and the pigmy rabbit {Brachylagus 

 idahoensis) . To the north, in the mountainous portion of the State, 

 are found the snow-shoe rabbit {Lepus hairdii hairdii) and the pika 

 (Ochotona princeps lemhi). A second pika {Ochotona schisticeps 

 goldmani) is recorded from the lava beds to the northeast of Hager- 



O^v^O 



a 6 



FiGDRE 1. — Hypolagus, near vetus (Kellogg) : a. Fragment of 

 right ramus of mandible (U.S.N.M. no. 12620) ; 6, fragment of 

 right ramus of mandible (U.S.N.M. no. 12621). Lateral views 

 X 1, occlusal views X 2. Hagerman lake beds, Upper Plio- 

 cene, Idaho. 



man. A marked diversity of lagomorphs is also found to the south 

 in the Basin and Kange province. 



Drawings for all the figures herein were made by Sydney Prentice. 



HYPOLAGUS. near VETUS (Kellogg) i 



Figure 1 



Three fragmentary mandibles, a number of isolated teeth, and a 

 few limb bones from the vicinity of Hagerman, Idaho, are recognized 

 as belonging to a species near, or possibly identical with, Hypolagus 

 vetus. H. vetus is the type species and was originally described from 

 the Pliocene beds at Thousand Creek in northwestern Nevada, It 

 appears likely that the Hagerman material is specifically distinct 

 from the form occurring in the earlier Pliocene beds of Nevada, but 

 the few differences observed in the incomplete material at hand do 

 not warrant recognizing a distinct form. 



1 Kellogg, L., Univ. California Publ. Bull. Dept. Geol., vol. 5. pp. 436-437. 1910; see 

 also Dice, L. R., Univ. California Publ. Bull. Dept. Geol., vol. 10, pp. 181-182, 1917. 



