. 34 
AETICLE II.—NOTES ON INSECTS INJUEIOUS TO WHEAT, 
1. The Larger Wheat Straw Worm. 
(Isosoma grande, Eiley.) 
Order Hymenoptera. Family Chalcidime. 
In May of this year, Mr. Garman collected from wheat fields in 
Clark county, in Eastern Illinois, and sent to the Laboratory (where 
they were received May 21,) straws containing a larva similar to 
that of Isosoma tritici, but larger, and evidently differing from that 
in life history. These were imbedded in the center of the stalk, 
just above the lowest joint, where they caused a bulbous enlarge¬ 
ment of the stem, the plants containing the insects being dwarfed 
or killed in every case noticed. The fact that the inner surface of 
the stem containing the larvae had been eaten and torn was plainly 
perceptible. 
On the 6th of June, the living, winged adults emerged from these 
examples, and all the remaining straws contained at this time pupae 
in the pupal envelope. The straws had been kept too dry, however, 
and the insects had died within them. On the 24th of May, adults 
of this species were found not uncommon in wheat fields at West 
Union, and on the 27th at Mount Carmel, in Wabash county, where 
a few stalks of wheat which had been evidently inhabited by the 
worm were likewise noticed. At Carmi, in the same county, on the 
30th, stalks which had been injured by them were again observed, 
although none contained the larvae; but several imagos were taken 
within them, as also at Eldorado on the day following. At Villa 
Ridge, on the 3d of June, many dwarfed stalks of wheat were found 
in the fields from which this species had apparently emerged, but 
no specimens were taken here by sweeping. No further observations 
were made upon this species throughout the year, but I learned 
from Mr. F. M. Webster, an assistant to the Entomologist of the 
United States Department of Agriculture, that he found it after¬ 
wards in wheat fields in Indiana, near the Illinois line. 
[From the last Eeport of the United States Entomologist (1884), 
