Article; IV. — Some Additional Records of Cliironoinidce for Illi- 

 nois and Notes on other Illinois Diptera. By J. R. Mai^loch. 



In a previous paper, Article 6 of Volume X of this Bulletin, I indi- 

 cated that despite the fact that our stale list of species of Chironotnid(C 

 is larger than any list yet published for any other state in the Union it 

 could not be considered as a complete list of all the species occurring in 

 Illinois. The greater portion of the material upon which the previous 

 paper was based consisted of species collected by Mr. C. A. Hart and 

 the writer during 19 14, and containing, as it did, but a small series of 

 collections from a number of scattered localities it could not be expect- 

 ed to include all of our species. Being aware of this fact and desirous 

 of obtaining as many species as possible, the writer during the present 

 year has devoted most of his spare time to collecting in the vicinity of 

 White Heath, on the Sangamon River, with a view to completing the 

 series of Ceratopogonince in the collection in so far as that particular 

 locality is concerned. No material from this part of the Sangamon 

 River was contained in that previously studied, though many of the 

 species were obtained near Monticello, which is but a few miles down 

 river from this point. 



An attempt was also made to discover what species attacked man 

 and at what particular time and in what situations. The writer en- 

 dured considerable discomfort in his investigations, as mosquitoes 

 were very numerous and bit very severely upon every occasion that he 

 visited the river. In addition to the moscjuitoes the writer had upon 

 one occasion the experience of being bitten by the nymph of a capsid. 

 It is not possible at present to determine the species of this insect be- 

 yond the fact that it is certainly not Lygus pratensis — a species which 

 I have seen in the act of biting at Chain Bridge. Xix., and which is 

 recognized as having that proclivity. 



Another source of annoyance was provided by the females of a 

 small black bee (Halictus sp. ), which persistently settled \\{)on the bare 

 arms, evidently attracted by the perspiration. On two days this species 

 occurred in fair numbers and was very annoying, settling on the arms 

 and being with difficulty brushed off. Judging from the actions of the 

 insects they were sucking up the small particles of perspiration. 



