June is, 1921 Life-History Studies of Three Jointworm Parasites 415 
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to deposit one egg. The females have been observed ovipositing at 
night in the breeding cages,, but the greatest activity occurs during 
daylight. 
HOMOPORUS CHALCIDIPHAGUS 1 
This species was first described, male and female (fig. 8), in 1869. 2 
This is one of the oldest recorded parasites of the jointworm and has 
been reported many times in literature, though the detailed account of 
its life history has not as yet appeared in print. 
Next to Ditropinotus aureoviridis it is the most important parasite of 
Harmolila tritici in Michigan, Illinois, Indiana, Ohio, Kentucky, Tennes- 
Fic. S.-HomcPorus ehalcUipkatus: A, Adult female; B, antcuua of adult female; C, antenna of adult 
male; D, wing of adult male. 
see, and Missouri. In the Atlantic States Eurytoma sp. is probably 
of greater importance than H. chalcidiphagus; in fact, at some points 
Eurytoma spp. undoubtedly ranks first in importance of the parasites of 
H. tritici. H . chalcidiphagus undoubtedly suffers more from the depre¬ 
dations of secondary parasites than any of the other primary parasites 
of the jointworm that have come under the observation of the writers. 
As evidence of this fact, H . chalcidiphagus was very abundant at War¬ 
ren ton, Va., when the status of the various parasites was first studied 
there, whereas at the present time it scarcely exists in this locality. 
This is true in spite of the fact that there are five generations a year of 
family Pteromalidae, Subfamily Merisinac. 
a Walsh. Benjamin D., and Riley, Charles V. 
Amer. Entomologist, v. i, no. 8. p. 152. 1869. 
THE JOINT-WORM (iSOSOMA HORDEI HARRIS). In 
