. Some common mammals of western Montana in relation to agriculture and spotted fever . ng the burrows arenot endangered. Thedisadvantages are thatthe surface sets requiremore time to make, thatthey occasionally catchmeadow larks, quail, orother valuable birds,andthat they are not alwayscllVctive whein green vegetation is abundant. Jump traps withtheir large pans are better suited to surface sets than are thesmall-panned outside-spring traps, for the animals are likely to walkaround the latter sortof traps instead ofstepping into clods ofearth placed on oppo-site sides of the tr
. Some common mammals of western Montana in relation to agriculture and spotted fever . ng the burrows arenot endangered. Thedisadvantages are thatthe surface sets requiremore time to make, thatthey occasionally catchmeadow larks, quail, orother valuable birds,andthat they are not alwayscllVctive whein green vegetation is abundant. Jump traps withtheir large pans are better suited to surface sets than are thesmall-panned outside-spring traps, for the animals are likely to walkaround the latter sortof traps instead ofstepping into clods ofearth placed on oppo-site sides of the trapsserve to guide thesquirrels into them. The most effectivetrapping can be doneby using a combina-tion of hole and sur-face sets made as cir-cumstances suggest,and with jump traps,perhaps one-third ofwhich are Xo. 1 andthe rest No. 0. In thiscase the No. 1 trap-should be reserved forthe surface sets and the smaller size used in the holes. As a rulewaste land, where burrows are numerous, can be trapped to the bestadvantage with surface sets, while hole sets are more effective in 484. Fig. -Two Columbian ground squirrels caught insurface-set jump trap. COMMON MAMMALS OF WESTERN MONTANA. 19 cultivated areas, where each squirrel has but a few holes. Trapsshould be visited at least once a day, in order both to secure the bestresults and to avoid causing imprisoned animals unnecessary suffer-ing. Figure 10 illustrates one way of handling a considerable num-ber of traps. Ordinary Xo. 1 steel traps cost about $125 to $130 a thousand and jump traps are slightly more expensive. FUMIGATION. Fumigation with carbon bisulphid is very effective when employedearly in the season while the ground is still damp. Dry ground
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