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Journal of Agricultural Research 
Vol. XXI, No. 6 
(Phytophaga destructor Say) and the majority of the species of Harmolita 
are found. This includes practically all the wheat-growing regions of 
the United States. The writers feel that scientists in the past have given 
undue prominence to E. allynii as a primary parasite of the joint worm. 
D. aureoviridis, where it is normally found, occurs in greater abundance 
than either of the other two parasites treated in this paper. 
Flo. i.—Present knovra distribution of the wheat jointworm in the United States. 
METHODS OF REARING 
The adult parasites used in this breeding work were obtained from 
material collected in various localities and kept through the winter at 
the laboratory at Charlottesville, Va., under as nearly normal conditions 
as could be provided. The parasites were placed in a cage (PI. 79, A) 
which contained stock material of Harmolita tritici. This cage was a 
glass cylinder 9 by 14 inches, having a cheesecloth cover. It was placed 
upon a saucer of moist sand into which the stems containing galls of 
H. tritici were placed. The ordinary greenhouse wooden label was used 
for identification of the cages. Another very successful breeding cage 
(PI. 74, A) which was used consisted of a lantern globe with a cheese¬ 
cloth cover, placed upon a 5-inch pot. The parasites were given fresh 
straws for oviposition fcach morning and a few drops of dilute sugar 
water for them to feed upon. Feeding once a day seemed sufficient to 
supply the needs of the parasites. Oviposition was observed in these 
cages, and the stems were removed promptly and dissected. Eggs with 
their host were removed to glass cell cages 1 which were made for this 
1 Packard, C. M. life histories and methods of rearing hessian fly parasites. In Jour. Agr. 
Research, v. 6, no. io, p. 367-382, pi. 51-52. 1916. 
