During the last of April and through the month of May, 1877, I found the larvæ of this moth in grassy places in Washington county, Illinois. when full grown they were 1.75 inches long, robust, the head four-sevenths the width of the middle of the body. The color of the under side yellowish gray. Above the line of the lower part of the stigmata, four broad dark brown stripes alternating with three narrow grayish yellow ones, the latter in the dorsal and sub-dorsal regions, and much lighter at the extremities of the body. Head gray, mottled with brown, brown border to the inner part of eyes. cervical shield very dark brown, crossed by dorsal and sub-dorsal light lines. No hairs noticeable except with g1ass.