PREDACEOUS ENEMIES. 
133 
plant-lice or other insects are impaled and held prisoners until they 
are sucked dry. They are then released and the Chrysopa larvae 
hunt other victims. 
Cecidomyiidse. 
During September of 1909, at Lafayette, Ind., a new predaceous 
insect enemy to Toxoptera was discovered in the larvae of a little 
cecidomyiid or two-winged fly, determined tentatively for us as 
ApMdoletes sp. by Dr. E. P. Felt. It was first observed in one of the 
stock cages and afterwards it was found to be reproducing in the fields 
on Myzus persicae. 
Fig. 46.— The golden-eyed lace-wing fly ( Chrysopa oculata), an enemy of the spring grain-aphis, a, Eggs; 
b, full-grown larva; c, foot of same; d, larva devouring an insect; e, cocoon; /, adult insect; g, head of 
same; h, adult, natural size. All enlarged except h. (From Marlatfc.) 
We have not as yet carefully studied the life history of ApMdoletes 
sp. The adult fly (fig. 47) is a frail little creature, about the size of 
the clover-seed midge, pale cream in color, and the abdomen has a 
pinkish tinge, due to the pink eggs within. The eggs resemble 
those of the Hessian fly very closely except that they are much 
smaller. The larvae (fig. 48), which are pinkish in color, descend to 
the ground when fully matured, and at or near the surface they spin a 
loose cocoon, to which particles of dirt and trash adhere. In a few days 
the adults issue. The time required for this little insect to complete 
the entire life cycle is apparently about 10 to 14 days. The species 
is not determinable further than the genus for the reason that only 
the female adults have been secured. 
