PAKASITE, APHIDIUS TESTACEIPES. 
Ill 
Mr. Kelly, of this bureau, later took up the observations at this 
point, during the fall of 1908, and published the results of his obser- 
Fig. 22.— Position of larva of Aphidius tcstaceipes in the body of the spring grain-aphis at the beginning of 
the change to a yellowish color. Much enlarged. (Original.) 
vations in the Proceedings of the Entomological Society of Wash- 
ington. 1 Mr. Kelly confined some aphidids that were nearly dead 
from parasite attack on a slide and 
observed them under the microscope. 
He found that as the body of the " green 
bug" takes on a brownish tint, the 
Aphidius larva within makes a longi- 
tudinal slit or opening in the ventrum 
and enlarges it until it is more or less 
oval in shape, as shown in figure 24. 
The rigid, firm manner in which Tox- 
optera grasps the object upon which 
it is resting at death apparently has the 
effect of holding it in place while the 
movements of the parasitic larva are 
going on within. When the opening is 
complete the larva begins to spin its cocoon, at the same time 
ejecting a glutinous fluid that makes the strands adhere to any object 
Fig. 23.— Full-grown larva of Aphidius 
testaceipes taken from body of the spring 
grain-aphis as shown in figure 22. 
Much enlarged. (Original.) 
i Proc, Ent. Soc Wash., vol. 11, No. 2, pp. 64-66, 1909. 
