438 
Journal of Agricultural Research 
Vol. II, No. 6 
appeared to know that the parasites were after them, as when they took 
wing they made many twists and turns in attempting to get away from 
the flies. Several adults of Sarcophaga kellyi were reared from this 
Wellston material, while later investigations indicated that the grass¬ 
hoppers had been materially reduced and practically controlled, so that in 
late September few eggs were to be found. 
REARING EXPERIMENTS WITH SARCOPHAGIDS 
In order to get ample material for study and identification of the species 
involved, a lot of parasitized grasshoppers were collected and placed in 
rearing cages. Seventy-two grasshoppers containing a number of these 
sarcophagid larvae were collected at the edge of a wheat field on October 
21,1912, and were put in a closed receptacle containing soil; on November 
6 following, 97 sarcophagid larvae were removed from the soil. On 
December 3, 24 of these pupated and were removed to a receptacle 
especially designed for rearing Diptera. The remaining 73 larvae were 
allowed to continue for hibernation in the soil, which was placed in 
flowerpots in the laboratory, where they began to pupate on February 3, 
1913, adults issuing from the former lot of 24 by the middle of February 
and from the latter 73 in early March. 
On November 8, 1912, 118 living grasshoppers were collected in the 
same wheat field from which the 72 dead individuals previously men¬ 
tioned were obtained. Owing to the lateness of the season, these grass¬ 
hoppers were quite sluggish, but dissection of some of them revealed 
nearly grown Sarcophaga maggots, as many as 5 to 9 larvae being re¬ 
moved from some of the grasshoppers. The remaining living grasshop¬ 
pers were placed in a Riley rearing cage outdoors near the laboratory, 
but all of them were dead by November 28. The soil of this cage was 
examined on December 5, and 137 sarcophagid larvae were removed 
from it, 75 of these being placed in a large flowerpot and removed to 
the laboratory, while the remainder were placed in a similar flowerpot 
which was buried in the soil in the field. These two cages were covered 
with wire screens. From the indoor cage adults began to issue on 
February 24, 1913, and continued to issue until May 3. From the 
flowerpot placed in the field adults began to issue on March 8, continu¬ 
ing to issue until May 5, when the soil was examined and the puparia 
were all found to be empty. 
From the bodies of some 800 dead grasshoppers collected during the 
fall of 1912 nearly 1,200 Sarcophaga of several species issued. About 
800 of these were kept inside in flowerpots and other rearing receptacles, 
from which adults began to issue about the middle of February, contin¬ 
uing to issue until early May. About 400 of this lot of larvae were placed 
in large flowerpots, securely covered, and buried in the soil in the field. 
An examination of one of these flowerpots in mid-December while the 
ground was thoroughly frozen indicated that the Sarcophaga were 
hibernating as larvae. These larvae were at once returned to the soil,, 
but unfortunately they were killed by the transfer. Another of these 
outdoor flowerpots was examined in February. It being then clear 
that the larvae had not yet pupated, continued examination until March 8 
was made necessary in order that the date of pupation under natural 
conditions might be learned. 
Adults from the flowerpots in the field began to issue in late March 
and continued emerging until Mav 28. Comparison of the adults reared 
