1911] Taylor: Mammals of the 1909 Nevada Expedition. 237 



an altitude of 48{)() feet. The other juvenal was trapped at the 

 head of Big Creek (altitude 8000 feet). The first locality is in 

 Upper Sonoran, but the second is possibly in Transition. Osgood 

 records the species as an Upper Sonoran zone animal. 



The fact that the three mice here recorded were the only ones 

 secured, although a large number of traps were run daily for 

 two months in localities apparently as favorable for their habita- 

 tion as the places where they were actually caught, seems to con- 

 firm Osgood's statement (1909, p. 230) that the species is rare. 



Reithrodontomys megalotis deserti Allen. 

 Desert Harvest Mouse. 



Status. — The material at hand consists of thirty-one speci- 

 mens, twenty-two of which are fully adult. This series presents 

 characters which are different from any Reithrodo)itomys of 

 which examples are available at this time, and it is only provision- 

 ally that these specimens from northern Nevada are referred to 

 deserti. 



A series of Beithrodontomijs m. deserti from Victorville, on 

 the Mohave Desert of California, is accessible. The type locality 

 of deserti (Allen, 1895a, p. 127) is Oasis Valley, Nye County, 

 Nevada. Specimens from Winslow, Arizona, from Nye and 

 Esmeralda counties, Nevada, and Inyo County, California, are 

 referred to this subspecies by Allen. Bailey (1908, p. 16) con- 

 siders the Reithrodontomys of the northern i:)art of the Great 

 Basin as belonging to it. From geographical considerations it 

 might be anticipated that liafnathensis (C. H. IMerriam, 1899, 

 p. 93), type locality Big Spring, "Mayten," Shasta Valley, Cali- 

 fornia, would invade northern Nevada. Three specimens of this 

 form have been loaned the writer by Dr. C. Hart ^lerriam. Two 

 of these individuals are young adults, taken on September 19, 

 the third being a fully adult animal secured July 12. Our series 

 was collected between May 14 and June 17. The Victorville speci- 

 mens of deserti are IVIarch animals, so not strictly comparable as 

 to pelage. The probabilities are, too, that specimens from this 

 locality are not absolutelj^ typical of the subspecies eleserti. 



The examples from northern Nevada are evidently nearer 



