114 



andD. deMUs, tliougli very similar wlieu first liatclied, are readily sep- 

 arated after the first or second moult by this character, debiUs being 

 uniformly light. Adults of D. deMUs were first taken June 2, and aj)- 

 X)eared in general ten days to two weeks before adults of inimicusy 

 though, as before stated, the first larvaSj found April 23, deYelox)ed into 

 inimicus by June 29. 



Adults qI deMUs confined in breeding jars June 3 died in about ten 

 days, and larvae hatched in these jars July 5, so the period of incuba- 

 tion for this generation, and with breeding jar conditions, would be be- 

 tween three and four weeks. The bulk of this second generation are 

 disax)pearing (August 12), and if larv» of a third brood appear in two 

 or three weeks there might possibly be four broods in the season. 



Adults of D. immicus were confined in jars with Blue Grass July 8, 

 and all adults were dead about the loth of the same month, and larvse 

 api)eared the 25th. The period of incubation could not have been more 

 than seventeen nor less than ten days. The first two specimens of 

 which we have record moulted July 29, or four days after hatching ; the 

 second moult occurred August 6, or eight days after first moult. Other 

 specimens gave second moult on 8th, 6th, 8th, 10th, and 10th of August, 

 respectively. 



Possibly there are only two broods of D. inimicus, but more probably 

 three, at any rate, in seasons of ordinary length, as I believe their rapid- 

 ity of development is considerably affected by weather. When ready 

 to emerge the larva ascends some blade of grass, invariably with the 

 head directed upward, the usual position at all times, and fastening 

 itself to the stem, the skin splits along the center of the back and the 

 insect emerges and the cast skins will often be seen adhering to the 

 blades of grass some time after the moulting has occurred. 



A large per cent, possibly 10 per cent, of the spring broods of larvae 

 were infested with small red mites, some of them almost as large as 

 their hosts, and these likely weaken them, if not causing any more seri- 

 ous result, and may do a little toward checking their injuries. 



Mr. Osborn then read the following notes on Kansas insects, by re- 

 quest of the author : 



KANSAS NOTES. 



By V. L. Kellogg, Lawrence, Kans. 



The two chief insect enemies of the Kansas farmer are the Chinch Bug 

 and Hessian Fly. No year but is marked by the ravages of these pests 

 to a greater or less extent in some part or over the whole of the State. 



The Hessian Fly {Cecidomyia destructor) was present in usual num- 

 bers in 1891. It has been estimated that the Hessian Fly annually cur- 

 tails the wheat crop of Kansas by 10 per cent. This year (1892) this pest 

 seems to be in unusually small numbers. The hibernating individuals 



