11 
Various syrphid larvae that destroy M. pisi are themselves attacked 
by Podisus iiiacnliventris (spinosus) and Euschistus variolar iits; and 
the eggs of these pentatomids are parasitized by a proctotrypid, Teleno- 
mus podisi Ashm. (determined by A. A. Girault). 
Chrysopidcc. — A few species of Chrysopa (Fig. 9) are common in 
the clover field. The adults, known as lace-wing flies, are green or 
less often yellow, with golden eyes and four similar gauzy wings, finely 
netted with veins. A few species have a characteristic odor — C. ocu- 
lata, for example. By day the flight is rather sluggish, but toward 
evening tlie lacewings become more alert; they often fly to a light at 
night. Most of the species hibernate as pupse, so far as is known, but 
plorabnnda winters as an adult. We have often found it hibernating 
under dead leaves ; then the insect is brown in color. Our species lay 
Fig. 9.- — Lace-wing Fly, Chrysopa oculata: a, eggs; b, larva; c, foot of same; d, larva 
devouring pear-tree Psylla; e, cocoon; f. adult; g, head of same; h, adult, natural size. 
(Chittenden, Circ. 43, Bur. Ent, U. S. Dept. of Agriculture.) 
their eggs each at the tip of a long stiff thread and always in the vicin- 
ity of plant-lice, which are the chief food of the larvae. In clover 
fields the eggs are common on leaves or stems, and the larvae eat raven- 
ously M. pisi and other aphids,"and eat one another now and then, — 
particularly when a lot of them issue at the same time from one cluster 
of eggs. The prey is seized between the points of the long, tapering 
mandibles of the aphis-lion and the blood is sucked back thru a chan- 
nel made by a groove along the inner face of the mandible, against 
which the maxilla fits, to form a closed channel. A newly born larva, 
