HIGH PRAIRIE 



291 



299 



300 



FIG. 299. A parasitic wasp depositing 

 eggs in the body of a grain louse (after 

 Washburn, Bull. 108, Fig. 16, p. 274). 



FIG. 300. A louse killed by a parasite 

 (after Washburn, loc. cit., Fig. 12, p. 276). 



FIG. 301. The life history of the golden-eyed lacewing (Chrysopa oculata): 

 a, eggs; b, the larva "aphis-lion"; c, foot of the larva; d, the larva seizing an aphid; 

 e, the pupal cocoon; /, g, k, the adult; h, natural size (after Chittenden, Div. Ent., 

 U.S. Dept. Agr.). 



