24 
BULLETIN 1429, TJ. S. DEPARTMENT OF AGRICULTURE 
accomplished, and the body contents entirely consumed, it again 
turns and leaves through the aperture previously made. Pupation 
takes place in the soil 1 or 2 inches beneath the host remains. 
The duration of the various stages in the life cycle is not uniform, 
and the early stages may be greatly prolonged. The newly deposited 
larvae are capable of wandering about in the soil for a week or more in 
Fig. 20.— A, first-stage larva of Dexia ventralis; B, antenna; C, mouth parts; D, enlarged 
portion of derm; E, lateral view of caudal end of larva; F, first-stage larva of Prosena siberita; 
Q, mouth parts; H, enlarged portion of derm; I, posterior spiracle of third-stage larva, 
Prosena siberita 
search of the host, and after entrance is effected the further duration 
of the stage is dependent on temperature conditions and may be 
extended to the following spring. Usually, however, the first molt 
occurs during the fall, and the winter is passed in the early second 
stage. The third stage is relatively short, as determined by dissec- 
tions of a considerable series of parasitized grubs during May and 
June. 
