1911J Taylor: Mammals of the 1909 Nevada Expedition. 241 

 Cranial Measurements of Three Species op Eeiihrodontomi/s. 



For method of taking measurements, see Introduction. 

 All dimensions are in millimeters. 



s 



^ Species 



8209 c^ad. Beithrodoiitomys m. 



desert i 

 8124 J' ad. Beitlirodoniomys m. 



desert i 

 8190 cj' ad. Eeithrodoiitomys ni. 



deserti 

 8200 c? ad. Beithrodoiitomys m. 



deserti 

 Average of all the adults 



95456 (^" Eeiihrodontomys 



llamathensis 



95457 cj"* Beithrodoiitomys 



llamathensis 

 97883 J Beithrodoiitomys 



llamatlieiisis 

 Average of all the adults 



7446 (^ a<l. Beithrodoiitomys m. 



loncjicauda 

 3068 J' ad. Beithrodoiitomys m. 



longicauda 

 2397 cj' ad. Beithrodoiitomys m. 



loiu/icauda 21.3 10.0 3.5 3.0 7.7 36.1 



Average of all the adults 20.90 10.00 3.30 3.00 7.66 37.23 



* Young adults. 



Comparison of the series and a study of descriptions show 

 clearly that the animals are nearest E. m. deserti. Some of the 

 facts of coloration, size, and geographic distribution here pre- 

 sented argue that llamathensis should also be regarded as a sub- 

 species of meejalolis, though intergradation has not been demon- 

 strated. 



