Peterson. 1935. June 29. Yesterday rode 3 mi. E of Joulon with Dr. Hall in his Ford roadster on dry Humboldt Lake bottom, outer borders of which rather thickly covered with bushes of [illegible], further interiorly larger clumps of same bushes farther apart (50 & 150 ft. apart), and no vegetation in central basin. Lake bottom hard + sandy save where drifting sand deposited. 70 small traps set by myself amongst rather closely set bushes in drifted sand. Out to collect catch at sunrise. Catch included 3 Dipodomys d. deserti and 10 Peromyscus m. sonoriensis. Study skins of 2 Dipodomys and 2 Peromyscus prepared; rest discarded. Alimentary tract of 2 Dipodomys d. deserti and one Dipodomys merriami merriami examined for parasites: none found; slides made of cecal contents, fixed in Schaudinn's fluid. 75 mouse traps set 1½ mi. NE Joulon. June 30. Total of 34 mice caught with 75 traps, including one Reithrodontomys m. megalotis, one Onychomys leucogaster, and several of the following: