266 Univcrsitij of Calif oruia Puhlications in Zoology. [Vol. 7 



Distribution. — Workings of the Nevada gopher were seen 

 near Winnemucca, on the flat west of Amos, in an alfalfa field 

 on Chimney Creek (Santa Rosa Mountains), at Alder Creek and 

 Big Creek ranches (Pine Forest ^Mountains), and at Qninn River 

 Crossing. Fourteen were trapped at the latter locality, and three 

 at Big Creek Ranch. Gopher workings were seen at intervals 

 along the course of the stream from the ranch up into the moun- 

 tains. It is not certain just where the dividing line lies between 

 ncvadensis and fuscus fisltcri. Nevadoisis is, however, typically 

 a species of the desert flat, which ranges between 4000 and 5000 

 feet in altitude, while fuscus fishcri was not taken below 7000 

 feet. 



The present records extend the known geographic range of 

 the species considerably to the northward. The type locality is 

 Austin, Lander County, Nevada, which lies a hundred miles 

 south and east of "Winnemucca. Quinn River Crossing is about 

 sixty miles north and west of the same place. Further work will 

 undoubtedly show nevadensis to be generally distributed in suit- 

 able situations on the flat of the northern part, at least, of the 

 Great Basin Plateau. 



Habits.— Allen (1895b, p. 207) and Grinnell (1908, p. 151) 

 record the preponderance of females in series of gophers from 

 particular localities. The results of our trapping show a similar 

 discrepancy in rehitive numbers of the sexes. Only five speci- 

 mens of the seventeen secured are males. 



Apparently there is a fairly definite mating period. The first 

 Juvenal was taken on May 29, and thereafter young specimens 

 were secured almost every day. All adults showed b.y the con- 

 dition of the reproductive organs that sexual activity was at its 

 height. Evidently our work was carried on during the suckling 

 period. None of the females secured contained embryos. No. 

 7869, a male juvenal, was caught ^Tune 1)^ and possesses skull 

 characters that would be expected in a specimen two weeks older 

 than the first ones caught the last of JMay. 



Very large mounds of earth arc thrown \\\) hy this s])ecies. 

 One mound seen at Big Creek Ranch was three feet long and two 

 feet wide, and contained a freshly dug out stone three inches 

 long and two inches in diameter. "Wherever workings were 



