26 
/ 
tenths full-grown naked larvae, and the remaining fifth, in various i 
stages of growth, from half a millimeter upwards. Not unfrecjuently 
four or five larvae were found in a single stalk, and as many as 
two m probably half those examined. The wheat was about six . 
inches high the dead stalks from three to five inches. One dark- 1 
colored broken puparium noticed contained the larva not yet pupated, jj 
In wheat brought in from the field at this time, eighty-six examples J 
of the fly were found; twenty-two of them larvae less than half! 
grown and twenty-eight larger, twenty-four recent puparia, mostly 
formed since collecting, and twelve puparia whose deeper color' 
showed their greater age. On the 5th November the wheat re- 1 
maining in this field which had escaped the plow contained many i 
puparia of the fly and an occasional nearly full-grown larva. In a' 
strip of young wheat adjoining this (sowed Oct. 5), at this date 
just beginning to stool, an abundance of larvae of the Hessian fly 
occurred,—mostly full grown, but a few of them young. As this 
wheat could not have appeared above ground before October 12, 
these larvae must have developed from the egg within three w r eeks. 
I ought to add that careful sweepings w T ere made both in and 
around the wheat fields on all our visits, in the vain hope of ob¬ 
taining the adult fly. 
The Effingham County Field. — Four sowings w T ere made at, 
Edge wood, as at Billett Station, and at similar intervals; but as.! 
only one, that made August 5, w as successful, the others failing to s 
geiminate on account of the extreme drouth, this one only need be 
discussed. August 21, this wheat, although w T ell up and large enough j 
to contain the fly, gave us no evidence of its presence. Unfortunately j 
no other visit was made here until September 22, and at this time] 
larvae of the fly were not uncommon in the field,— a few nearly full 
size, but most of them not over half grown. A number of these were! 
transferred with the wheat to breeding cages, and commenced to; 
form the puparium October 2, and to yield the fly October 22. 
Combining these data with those just given for the larva, we have 
a period of something over forty days for the development of the 
autumnal generation — the only part of its history not covered 
by these two observations being the time passed by the full growm 
larva before the formation of the puparium. This must vary 
gieatly with circumstances, as the larva may even form its pupa 
case—if deprived of food—some time before it has reached its 
normal size. A period of six or seven wreeks is probably about the 
normal one for a single generation fully supplied with food, under 
favorable weather conditions in fall. Other flies emerged October 29, 
and proceeded at once to lay eggs in the vial in which they were 
confined, the eggs adhering in a string as they w r ere extruded from 
the body of the female. 
October 12 I found this wdieat from six to eight inches high, j j 
well stooled, with here and there a dead stalk containing puparia |] 
of the fly, but only rarely a naked larva, — probably in not five per l 
cent, of the instances. Careful sweepings yielded no adults. j 
