10. Tail short, about oncfifth of total length; ears completely concealed by 



the fur; eastern states 11. 



Tail longer, from one-third to one-half of total length; ears usually visible 



above the fur 12. 



11. Total length four to five inches; with thirty-two teeth 



Blarma hrevxcauda (Say) Short-tailed Shrew 

 About three inches long; only thirty teeth, some minute 



Cryptotis parva (Say) Little Short-tailed Shrew 

 (and related forms) 



12. Three unicuspid teeth visible from side view of upper jaw 13. 

 Five unicuspid teeth, the most posterior often minute, visible from side 



viev/ of upper jaw 14. 



13. In the northern and north-central states 



Microsorex hoyi (Baird) Pigmy Shrew 

 In the southwestern states 



J\lotiosorex crawfordi (Coues) Crawford Shrew 



14. Hind feet with stiff hairs between the toes, making the feet more or less 



paddle-like; usually over six inches long (Subgenus ?<[eosorex, or genus 



Jsleosorex of some writers) 15. 



Hind feet not heavily haired; often smaller 16. 



15. Under parts scarcely lighter than upper parts; tail black above and below; 



Pacific coast region 



Sorex hendirii (Merriam) Bendire Water Shrew 

 Under parts much lighter than upper parts; tail blackish above, white 

 below; Rocky Mountain region and westward; also in the north-central 

 states 



Sorex palustris Richardson Richardson Water Shrew 



16. East of the Rockies 17. 

 In the Rocky Mountain region and westward 22. 



17. Fourth unicuspid tooth larger than the third; southeastern states 



Sorex longirostris Bachman Carolina Shrew 

 Fourth unicuspid tooth smaller than, or rarely as large as, the third (in 

 upper jaw) 18. 



18. Total length (including tail) of adult two and one-half to four inches 19. 

 Total length between four and five inches 20. 



19. Tail whitish below; under parts and feet whitish; N. D. southwestward 



Sorex merriami Dobson Merriam Shrew 

 Tail buffy below; under parts and feet pale grayish; generally distributed 

 Sorex cinereus Kerr Masked Shrew 



20. Fourth unicuspid tooth about as large as third; under side almost the same 



color as back; rostrum (from between eyes to snout) narrow and dc 

 pressed; New England through W. Va. 



Sorex dispar Batchelder Gray Shrew 

 Fourth unicuspid smaller than third; under side paler than back; rostrum 

 wide and depressed or narrow and elevated 21. 



493 



