37 
12th October. During all this time no imagos could be got by wide¬ 
spread and diligent sweeping. On the 14th of that month, how¬ 
ever, no larvae occurred in the experimental plots, but a single 
imago was taken in the one at Edgewood. Again, on the 27th 
October, an imago occurred in our collection at Champaign. On the 
31st October, 1884, half-grown larvae were found in rye; on the 2d 
November a single larva occurred in wheat at Billett Station; and on 
the 16th November full grown larvae were obtained at Edgewood. The 
passage from the second to the third brood of this species occurs, 
consequently, in October. 
To these data I will only add the following record of times and 
places of occurrence of the imago of the third ’brood. This was 
taken in wheat at Danville on the 20th May; at Urbana on the 
21st; at West Union, in Clark county, on the 24th; at Mt. Carmel 
on the 28th; at Anna on the 6th June; and at Champaign June 
18, at which latter date the larvae of the following generation were 
also already to be detected in the part of the stalk just above 
the upper node. 
■ 
Besides my own contributions, w r e have a series of observations 
made by Mr. F. M. Webster, an assistant to the Entomologist of 
the United States Department of' Agriculture, published partly in 
1885* and partly October 30,1886. f These observations, made in the 
I same latitude as my own, confirm the interpretation of the facts 
\ here given and extend somewhat the periods of the different 
I stages of the insect. They are incorporated in the calendar on 
^another page, but need not be separately discussed. 
Prof. A. J. Cook, of Michigan, reported in the “Prairie Farmer” 
1 for August 21, 1886, the frequent occurrence of the wheat bulb 
I worm in the stems of oats, upon which it produced, of course, 
Jthe same effect as upon wdieat and rye. He also suggests the 
j possibility of its working in autumn in volunteer oats. 
These data may be generalized in the following summary ac- 
i count of the life history of the species. The eggs of the first 
j brood are laid in May and June, the generation of larvae result- 
I ing continuing into July, but commencing to pupate in June, and 
1 first reaching the imago stage early in July. These imagos 
doubtless live until August, during the early part of which month 
I the eggs are laid for the second brood. The larvae of this brood 
i may be found in xAugust, September, and October, transformations 
i probably commencing during the latter part of August. Certainly 
[ imagos occur during September and October; and the eggs for 
i the third or winter brood are laid in September, so far as observed. 
E The larvae resulting from these eggs in October and November, 
hibernate without transformation and continue until the middle 
*Rep. Com. Ajzr. for 1884, p. 889. 
tPurdue Univ., School of Agr., Bull. No. 9, p. 5. 
