1915. J 



INTRODUCTION, 



23 



TTiomomys shows its vigor and adaptability by occupying the terri- 

 tory not inhabited by other more robust members of the family, which 



B 2046-122 



Fig. 5. — ^Map showing distribution of certain species and subspecies of Thomomys, and localities at which 



specimens were collected. 



1. fuscus. 



2. loringi. 



3. saturatus. 



4. my ops. 



5. columbianus. 



6. bridgeri. 



7. Uinta. 



8. quadratus. 



9. townsendi. 

 10. nevadensis. 



11. canus. 



12. monticola. 



13. pinetorum. 



14. mazama. 



15. nasicus. 



16. helleri. 



17. bulbivorus. 



18. hesperus. 



19. douglasi. 



20. oregonensis. 



21. yelmensis 



22. melanops 



23. limosus. 



24. mz(7cr. 



hold the milder, more luxuriant valleys. It lives in almost every 

 desert valley and rugged desert range of mountains, as well as on the 



