Land Mammals of San Diego. 3J 



3. Ovis Montana. Bighorn. l Mountain Sheep.' Rare 

 now. A few live in the rough foothills on the borders of the Col- 

 orado Desert and on the low, isolated mountains in the Desert. 

 The Indians tell me that the Bighorns eat cactuses as a substitute 

 for water in the dry season. 



4. Tamias lateralis. Say's Chipmunk. Rather common 

 in the upper pine region at from 6,000 to 10,000 ft. altitude in the 

 San Bernardino Mountains, and probably on Mt. San Jacinto at 

 the same elevation. 



5. Tamias asiaticus merriami. Merriam's Chipmunk. Low- 

 er part of the pine belt. I have taken specimens near Santa Ysa- 

 bel as low as 2,500 ft. altitude. 



6. Tamias asiaticus speciosa (Merriam). I have not seen 

 the description of this new race, but Dr Allen identifies certain of 

 my specimens as belonging to it. I may approximate its range 

 as the upper pine region, though I have obtained specimens on 

 the Cuyamaca Mountains as low as 5,000 ft. altitude. 



7. Tamias leucurus. White-tailed Chipmunk. Colorado 

 Desert and foothills of the eastern side of the mountains. 



8. Spermophilus grammurus beecheyi. California Ground 

 Squirrel. Abundant everywhere. 



9. Spermophilus tereticaudus. Round-tailed Squirrel. 

 Colorado Desert. The Mojave Ground Squirrel, S. Mojavensis 

 may occur in the north eastern part of the county. 



10. Sciurus fossor. California Gray Squirrel. Common in 

 the pine region. This species is at least as large as any other 

 American squirrel. 



11. Sciuropterus volucella. Flying Squirrel. I have re- 

 liable information of the occurrence of this species in the pine re- 

 gion, but it must be quite rare. 



12. Castor fiber. Beaver. Said to be not uncommon in the 

 Colorado River. 



13. Fiber zibethicus pallidus. Pale Muskrat. Dr. Mearns 

 states that this race occurs in the Colorado and Gila rivers. 



14. Arvicola riparius, var.? Meadow Mouse. Abundant 

 in moist localities where there is a heavy growth of grass. 



15. Hesperomys leucopus eremicus. 



16. h. leucopus sonorensis. 



17. h. leucopus anthonyi. 



18. h. leucopus deserticolus. 



19. H. leucopus, var.? The White-footed or Deer Mice 

 are abundant and generally distributed. The standing of the sev- 

 eral varieties is in dispute, and there is at least one undescribed 

 variety here (large, tail longer than head and body together). 

 The introduced House Mouse, Mus musculus, is replacing the 

 Deer Mice in the towns and thicker settlements. 



20. Hesperomys californicus. Parasitic Mouse. I have 

 taken this species just north of the county line, and have no doubt 

 that it occurs in this county. I know no reason why it should be 

 called a parasite. 



