FOOD SUPPLY 



49 



phenomenon of psedogenetic, or precocious multiplication 

 known as polyembryony in which a single egg of the parasite 



FIG. 23. A Hymenopterous parasite (Spalangia museidarum) of the housefly 

 and other related flies. The female Spalangia is shown thrusting her ovipositor 

 into the puparium of the fly. Below are shown the larva and pupa which de- 

 velop within the puparium. (After Pinkus.) 



deposited in the host egg gives rise to a series of larvae (often 

 several hundred) which develop within the host larva. Still 



