INSECTS INJURIOUS TO WHEAT. 



121 



of the abdomen being reddish and part of the legs 

 whitish/' This species has been taken on wheat in 

 Illinois, Nebraska, Delaware, Maryland, Ohio, Indiana, 

 and Pennsylvania. During 1886 and 1887 it did con- 

 siderable damage by cutting off the heads, — sometimes, as 



Fig, 69. — The Grass Saw-fly {Parhynemntus extensirornis Norton). 

 n, (1, eggs on wheat -blade; />, young larva?; c, full-grown larva; 



d, cocoon from which adult has emerged; e, f, adult insects — 



e, male; /, female, a and />, natural size; c-f, enlarged. (After 

 Riley and Marlatt, U. S. Dept. Agr.) 



stated by a Maryland man, cutting fully one-half of them. 

 No more recent damage has been recorded, and owing to 

 the slight damage usually done no remedies have received 

 a practical test. Deep fall plowing might be of advantage 

 by burying the larvae so deeply that the adults would be 

 unable to escape. 



