4 CONTKNTS. 



l'ngo. 



Pocket gophers 36 



Distribution and habits 36 



Injury to crops 37 



As tick hosts 38 



Poisoning 39 



Formula VII. Poisoned vegetables 39 



Trapping 40 



Rabbits -10 



Distribution and habits 40 



As tick hosts 41 



Injury to crops and fruit breed 41 



Rabbit-proof fences 42 



Trunk washes 42 



Trunk wrapping 43 



Poisoning 43 



As food 43 



Badgers 44 



Weasels 45 



Big game animals 45 



Mountain goata 45 



Elk : 45 



Deer 45 



Bears 46 



Coyotes 46 



Summary 46 



ILLUSTRATIONS. 



Page. 



FlG. 1. Twenty-seven rodents killed with 7 cents worth of poisoned grain. ... 9 



2. Columbian ground squirrel 10 



3. Columbian ground squirrel burrow in wheat field 12 



4. Carrots ruined by Columbian ground squirrels 13 



5. Washout caused by burrow of Columbian ground squirrel 13 



6. " Hole set," made with ordinary outside-spring steel trap 17 



7. Four-foot cedar trap stakes at burrows of Columbian ground squirrels. . 1 7 



8. "Surface set, " made with "jump "steel trap 18 



9. Two Columbian ground squirrels caught in a " surface-set " jump trap. . I 8 



10. A convenient method of carrying 200 traps and stakes 19 



11. Out lit for use in bisulphiding ground squirrel burrows 20 



12. Yellow-bellied chipmunk 21 



13. Chipmunk damage in wheat field 21 



14. Seed-spot of pine seeds pillaged by chipmunks 22 



15. Side-striped ground squirrel killed by carrying poisoned grain in 



cheek pouches 24 



10. Dissection showing 357 kernels of whole oats in cheek pouches of side- 

 striped ground squirrel 25 



17. Young pine squirrel 26 



18. Woodcfiuck, which injures crops and spreads spotted fever 27 



19. Partly engorged adult wood ticks on woodchuck 28 



20. Mouse refuse in holes left by burned stump and roots 29 



21. White-footed mouse killed by carrying 17 kernels of poisoned wheat . . 30 



22. Young wood rat 31 



23. Meadow mouse caught in unbailed trap 32 



24. Diagram of meadow mouse runway 33 



25. Mouse-infested stump in hayfield 33 



26. Alfalfa field ruined by meadow mice 34 



27. Apple tree killed by meadow mice 35 



28. Pocket gopher with pouches full 36 



29. Pocket gopher with pouches turned inside out 37 



30. Double line of gopher hills 37 



31. Stock of apple tree killed by pocket gophers 38 



32. Pocket gopher mound in wheat field 39 



33. Apple tree injured by rabbits 41 



34. Weasel, an active enemy of harmful rodents 44 



484 



