PBEDACEOUS ENEMIES. 
131 
in a report of the Department of Agriculture, 1 that he reared Syrphus 
americanus from Macrosiplium granaria. 
Fig. 43. —Syrphus americanus, whose larva destroys the spring grain-aphis: a, Female fly; b, second 
abdominal segment of male. Enlarged. (Original.) 
SpJxxrophoria cylindrica Say (fig. 45) was collected from wheat 
fields at Hiawatha, Kans., in 1907, by the junior author and was also 
Fig. 4i.—Eupeodcs volucris, whose larvae were the most abundant and useful in the fields where the spring 
grain-aphis was most- abundant in the Southwest during the spring of 1907. a, Female fly; b, abdomen 
of male; c, hypopygium of male. Enlarged. (Original.) 
reared from Toxoptera material sent in by Mr. Haynsworth from 
Sumter, S. C, the same year. Mr. G. G. Ainslie reared it from 
i Report of the Entomologist, U. S. Dept. of Agr. for 1889, p. 351. 
