50 



Calendar — Continued. 



EUPELMUS ALLYNI. 



Cata- 

 logue 



No. 



Place of Collection. 



Date of Emergence. 



2194... 

 2185... 

 2349... 

 2269... 

 4358... 

 4566... 

 4349... 

 4356... 

 3806... 



Villa Ridge 



Anna 



Anna . . .. 

 DuQuoin .. 



Anna 



Marshall .. 

 Robinson . 

 Marshall... 

 DuQuoin .. 



June 13- July 1,1884. 



" 13— " 18,1884. 



" 22— " 10,1884. 



" 20,1884 



July 111-26.1884 



" 26,1884 



" 10,1884 



7,1884 



Aug. 17,1883 



As a general result of these observations, we may say that, with 

 the single exception of Pteromalus pallipes, all the parasites bred by 

 us from wheat containing the Hessian fly emerged before the August 

 following the laying of the eggs from which they hatched, and that 

 the former species survived the winter in the flaxseeds of the flies, 

 not emerging until the succeeding summer. 



4. Note on the Wheat Midge. 



{Cecidomyia tritici, Kirby.) 

 Order Diptera. Family Cecidomyid^. 



(Plate IV. Fig. 3.) 



This frightfully destructive enemy of wheat appeared during the 

 last summer in extreme Northern Illinois in numbers and under cir- 

 cumstances to demand the attention of the economic entomologist ; 

 and although its life history and habits have long been well known, 

 its occurrence in the West in numbers sufficient to attract attention 

 has been so rare, that very little is known of it by the farmers of 

 our State. It consequently seems best to give here a brief report 

 of the observations made this summer in the wheat fields of Mc- 

 Henry county, together with a synopsis of its life history and such 

 recommendations of remedial measures as are warranted by our 

 present knowledge of the insect. 



My attention was first called to its prevalence in that region by 

 a letter, dated July 25, from Mr. R. W. Lane, of Chicago, who 

 transmitted heads of wheat from Genesee Depot, Wisconsin, which 

 I found to be seriously infested by the midge. Thinking it possi- 

 ble that the same insect was at work in adjacent parts of Illinois, 

 I visited the fields of the Fox River valley from Elgin northward, 

 on the 30th and 31st of that month. In every field but one which 

 I entered in the vicinity of McHenry and Ringwood, where spring 

 wheat only was raised, I found the midge larva upon the heads of 

 wheat, usually in only here and there a blackened head. In some 



