OF WASHINGTON. 115 
As yet no special effort has been made to determine the 
species and there may be more than one involved. With what 
data we now have, this infestation appears rather more marked 
in the east than to the westward, although it was reared fully 
as abundantly from Sault Ste. Marie, Mich., as from New 
York, but this may be due to a seemingly utter lack of parasites 
in the former locality. 
While it is yet too early to attempt to forecast its economic 
significance, it may be stated that I have been able to rear 
adults in greatest abundance from material secured where 
timothy hay is a main farm crop. Also, there has been no 
difficulty in rearing it from hay taken from meadows of several 
years standing and where last year's crop was short and the 
heads of the grass very small. So, too, where we get adults 
in greatest abundance a short crop of hay and seed was reported. 
I have so far been unable to locate those larvae in timothy 
about my own farms in northern Illinois, where we allow a 
meadow to stand but one year and then pasture it, and road- 
sides are kept mown off during the summer. These larvae 
work in the joint, precisely as does the summer form of Isosoma 
grande and they do not distort the stem after the manner of 
/. tritici in wheat. 
While all of this would indicate a foreshortening of the 
stem, and therefore a serious injury to the timothy hay crop, 
as well as a shrinking of the seed, also a valuable crop, we still 
lack the careful and exact studies in the field, necessary to 
prove this, and these we hope to supply during the coming 
summer 1 . It should be stated, however, that larvae have 
frequently been found in timothy stems of rank growth and 
seemingly full development. Whether we shall finally encoun- 
ter the same species in other grasses, or not, I cannot now say, 
but at least closely allied forms are obtainable from other 
grasses,, both wild and cultivated. 
Now, as to parasites. While, in our rearings from timothy, 
we get a limited number of the old and well known parasites 
of other species of Isosoma, viz, Eupelynus allynii, Stictonotus 
isosomatis and Semiotcllus ciialcidephagus, these have occurred 
comparatively rarely, though it must be stated that none of 
them have been found in great numbers, even in cases where 
Isosoma were excessively abundant in grain fields, as is usually 
the case. An undescribed species belonging to the genus 
Cryptopristus reared in immense numbers from wheat seriously 
affected by Isosoma tritici from Dublin, Va., to Clare, Mich., 
1 Since the presentation of this paper it has been shown that shrinkages 
in the seed may amount to from 5 to 18 per cent. F. M. W, 
