follow. As the eggs of the differential are not deposited before 
August 15, the appearance of the parasites long after the young 
grasshoppers emerge suggests that, were they to appear earlier, the 
species would perish for lack of food. Those reaching the adult as 
arly as June find food in the eggs of species of grasshoppers which 
deposit their eggs in the spring as Schistocerca americana, or in those 
of double brooded species, as Chortophaga viridifasciata. 
Parasites of nymphs and adults.—As the fight against the grasshop- 
pers progressed it was thought of interest to determine, as far as 
possible, all of the natural agencies at work, that with a fuller knowl- 
edge of these we might better know how to direct the expensive and 
time-consuming artificial measures, or knowing more accurately 
nature’s rigid methods of establishing equilibration among the beings 
Wx 
Fic. 9.—Sarcophaga sarracenix:; Larva at right; adultin center; puparium at left—enlarged (from 
Howard). 
in her charge we might assist and encourage her with less expense 
and more profit than carry out our own. 
From time to time hundreds of grasshoppers were collected and con- 
fined to cages where each day quantities of fresh food were given them. 
As the later stages of the grasshoppers were reached maggots were 
noticed emerging from the conjunctive (sutures) of the abdomino-tho- 
rax and head. None, however, appeared until after the specimens had 
died, either from the conditions of confinement or from the attack of 
the parasites. As the collections were made after the ‘‘ South African 
fungus” had been spread, many of the specimens were attacked by 
the parasitic flies and the fungus as well. Just to what extent the 
attack of the fungus encouraged the attack of the flies we were unable 
to determine. 
