120 



INSECTS INJURIOUS TO STAPLE CROPS. 



elongate, tapering gradually from the head to the last 

 segment; head yellowish, eyes black. Full growth is 

 attained in about five weeks, the mature larva having a 

 length of about four-fifths of an inch. The head is of a 

 pale clay-yellow color, the eyes are black, and the color 

 of the body is green or yellowish green. The larva is at 



Fig. 68. — Dolerus nrvensis Say, female. (After Riley and Marlatt, 

 "Insect Life," U. S. Dept. Agr ) 



once separated from the Dolerus larvae by the possession 

 of but seven pairs of abdominal feet.^^ (R. & M., 1. c. ) 

 When full-grown the larvae enter the earth and construct 

 silken cocoons, in which they doubtless remain unchanged 

 over winter, transforming to i^upae shortly before the 

 adults emerge the next spring. The form of the adults is 

 well shown in the illustration. " The female is stout and 

 in general light j^ellowish or ochraceous iu color. The 

 abdomen is for the most part dark brown or black, 

 dorsally, except the posterior lateral margin and the 

 extreme tip. The male is much more slender and elon- 

 gate than the female, and is almost black in color, the tip 



