8 FARMERS’ BULLETIN 166. 
there must be one or more additional generations, with a possibility 
of at least six in the extreme South. The first generation develops 
on wild plants. 
Fic. 7.—An ichneumon fly, Apantcles glomeratus, a valuable parasite of the common cab- 
y, Al g 5 
bage worm: a, Adult fly; b, cocoon; c, flies escaping from cocoons. a, b, Highly magni- 
fied; c, natural size. (Author’s illustration.) 
NATURAL ENEMIES. 
Were it not for certain effective checks this species would be a still 
greater pest. The most important of its insect enemies are small para- 
sites, all introductions from Europe. One of them, an ichneumon 
a X AN 
» A AS 
\ \\\\ 
S\ { Me, Mp. 
i MU a i 
Tia»! 
7) UY 
/ 
Fic. 8.—Parasitized cabbage worm, showing cocoon mass 
of ichneumon fly, Apanteles glomeratus, below. (Author's 
illustration.) 
fly: (figs. 7, 8), was 
purposely imported 
in 1883 from Eng- 
land. During the 
autumn of 1904 this 
species held its host 
under complete con- 
trol at Washington, 
D. C., killing every 
“worm” which came 
under the writer’s 
observation. A larva 
which has been de- 
stroyed by this parasite is shown in figure 7, }, together with the para- 
site’s cocoon. A minute chalcis fly? was present as a parasite of the . 
beneficial ichneumon fly, but apparently did not destroy the effective- 
ness of the latter. Another chalcis fly * (fig. 9) which bears the same 
1 Apanteles glomeratus L.; order Hymenoptera, family Braconidae. 
2 Tetrastichus microgastri Bouché, 
= Pteromalus puparum L. 
