41 



a few days later, and both free larvfe and flaxseeds were received 

 from a correspondent at Kobinson on tlie 2d of June. 



On the following day flaxseeds were received from West Union 

 in Clark county, which, placed in open fruit jars and moistened 

 regularly, being otherwise exposed to conditions as exactly similar to 

 those prevailing in the fields as I was able to supply in the Labo- 

 ratory, yielded adults from the '2'-^d to the 28ih June, while flaxseeds 

 obtained at the same date from Villa Kidge, in extreme Southern 

 Illinois, gave the imago from the 17tli to the 20th of that month. 

 Flaxseeds obtained on the 4th at Anna, in Union county, yielded 

 the adult on the !22d. Flaxseeds occurred again on the 6th and 

 7tli at DuQuoiu, and stalks received from Robinson on the 14th 

 contained a number of them and a single partly grown, naked larva. 

 Flaxseeds were collected at Robinson on the 17th, at Anna on the 

 following day, at Robinson on the 20th, and at Anna on the 24th. 

 ' Specimens of flaxseeds received from Robinson on this date 

 yielded the adult fiy in our breeding cages four days later. In Mar- 

 shall on the 25th, and at Robinson on the 27th and 30th, flaxseeds 

 were collected. One of those from the place last mentioned was 

 found, when opened, to contain a living larva ; but others were evi- 

 dently dried up, and several had already yielded parasites when 

 collected. Those obtained from Marshall on the 25tli were found in 

 the same condition, several containing living larvae and others being 

 dried up or parasitized. 



On the 28th imagos loere noted pairing in the breeding cages, hav- 

 ing just emerged from the flaxseeds obtained June 3 at West Union. 

 At Anna, on the 1st July, a most thorough and long continued searcb 

 in previously infested fields was made for the adult fly, the stubble 

 and still standing grain bemg carefully swept by us and the shocks 

 of grain being examined at great length. Situations adjacent to the 

 wheat fields likely to yield the fly were also carefully gone over; 

 but while numbers of other species of Cecidomyidee were collected, 

 not a single adult Hessian fly resulted from this search. 



Flax seeds still continued to come in'from Eastern Illinois, — some 

 empty shells and others containing healthy larvfe being received on 

 the 1st and 5th July from Marshall, on the 7th from Villa Ridge, 

 and on the 12th from Anna. 



On the 5th of this month a most extended and careful search was 

 made again in wheat fields near Anna by Mr. C. W. Butler, with 

 the same negative results as those of July 1, and my faithful cor- 

 respondents, E. C. Madison, of Marshall, and Thomas S. Moore, of 

 Robinson, both reported that they were unable to find the imago. 

 Unopened flaxseeds still occurred at Anna on the 12th, and on the 

 14th of that month my assistant, Mr. W. H. Garman, carefully, 

 and for several hours, searched the straws and stubble with the view 

 of testing the possiljility of the occurrence of a second brood of 

 flaxseeds in the upper part of the straw, — the descendants of the 

 flies emerging in May and June. None occurred in the upper joints, 

 however, although they were still abundant at the bases of the 

 straws. 



