PLATE 13 



Opius humilis: 



A. — Dead larva in first instar, with body shriveled and twisted through attack by 

 first-instar larva of Diachasma tryoni. X 100. 



B. — Dead larva in first instar; killed by first-instar larva of Diachasma tryoni. Here 

 the larva had been feeding and developing for several hours before being attacked by 

 the Diachasma larva. The body contents can be seen protruding from an inflicted 

 wound on the seventh and eighth body segments. X 100. 



C. — Dead larva in first instar; killed by first-stage larva of Diachasma tryoni. This 

 is the appearance of the dead Opius larvae most commonly seen. The body is pinched 

 by the mandibles of the Diachasma larva in the first or second body segment back 

 of the head. X 100. 



D. — Healthy, living larva in first instar. X 100. 



E. — Healthy, uninjured, living larva in first instar. X 100. 



