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—Cecidomyia 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. 

Tt 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 
