INSECTS INJURIOUS IN 1902. 7 
structor, Say. (see fig. 4), which so far as we know lays its eggs 
upon the young larva of the Hessian Fly and emerges a full grown 
insect from the so-called ‘flax seed.” Minute holes in the sheath 
at joints infested by the Hessian Fly show where this parasite has 
emerged, but unfortunately a minute secondary parasite (a species 
of Tetrastichus) reduces the numbers of our little friend Merisus. 
In a breeding jar kept under natural conditions one species 
Fig. 5.—Oecidomyia destructor (Hessian fly); (a) female fly; (b) flaxseed pupa ; 
(c) larva; (d) head and breast bone of same; (e) puparium; (f) cocoon; 
(g) infested wheat stem showing emergence of pupae and adults. 
‘ Cc. L. Mar’att, U. S. Dept. of Agr., Div. of Entomology. 
of Merisus emerged from “flax seeds” in straw Aug. 15th, and 
more later. 
See also Fig. 57 on page 67 at end of this report. 
CEE, CHINCH-BUG. 
Blissus leucopterus, Say. 
In view of all the previous publications from this office rela- 
tive to this pest, which well deserves second place in the year’s list 
of injurious insects, it is surprising that the entomologist should 
