MUS MUSCULUS MAR25 Point Isabel, Contra Costa Co., Calif. 6 in mus. spee's baited with walnuts in swicenia marsh in San Pablo Sportsmen Club shoot range. 1 small one with light underparts & goodish hair in ears, will put it up. MAR29 5 in traps near mine w/ location same type of low marsh with dryer knolls. 4 of them on lower ground - 1 on knoll. these mus only slightly lighter below than on top, MIR30 3 in traps on road about 3 ft. above sonic marsh just N.E. of MIR29# location, all in traps set on 2-3" grass under bushes. - Just at random among cozes of road. All only slightly lighter below than above, APR8 2 in traps beside road (as on MAR30) & in swicenia, caught close to MICROTUS - I guess using same runways. APR5 1 in trap on 3' wide dyke in marsh on NE side of road. 2'-3' above high tide mark, vegetation sonicornia, foot high grass in patches + some 2' high sparse bushes. APR29 3 in traps on N side of NW road into marsh. (I caught by tail - about middle of town and another tail only found in trap - about 1/2 inches long,