exhibit at County L'airs. A leaflet on the control of flies was printed 

 from State Entomologist funds to be distributed when these models 

 were exhil)ite(l. 



Stomoxys calcitrans. The Intiny stable fly is one of the most 

 important insect enemies of stock and as such has been gi^•en con- 

 siderable study. This was especially needed because of the sus- 

 pected connection of this fly with the transmission of such diseases 

 as swamp fever of horses and infantile i)aralysis of man. The study 

 of this fly is not yet completed, but will l)e continued fluring- another 

 year. 



Culicidae. There is a growing demand in Minnesota for infor- 

 mation regarding the mosquitoes of the state, both because of their 

 annoyance to man and as pests to our domestic animals. Two years 

 ago mosquitoes were so numerous that they were ciuoted as the 

 reason for increasing the price of milk. Extensive studies are under 

 way to determine exactly what mosquitoes are present in every part 

 of the state, their life histor}- and habits and best methods of control. 

 A report containing all the information that we have to date has 

 been prepared for publication in the biennial report of the State 

 Entomologist. 



Tabanidae. Horse flies are the most troublesome insect enemy 

 of domestic animals in the northern half of Minnesota. They appear 

 during the flrst half of the summer in enormous numbers and cause 

 heav}- losses to those attempting to conduct dairy farms in that part 

 of the state, in some places holding back the development of the 

 dairy industry almost completely. Mr. C. ^^ . Howard has gathered 

 considerable information about these flies, mostly in the way of 

 finding what species we ha\-e, what time of the summer they appear, 

 and in what types of country they are usually found. We are ready 

 to continue this work by studying their life histor\' in detail ; in this 

 Vv^ay seeking for some weak point at which they can be attacked. 

 Also in searching for some material which can l)e applied to the 

 skin of animals and will act as a repellant to keep the flies from 

 biting them. Nothing has l)een found vet that has been suitable 

 or cheap enough to ])e practical for the farmers to use. 



Chigger Mites. Detailed study has been given to two species 

 of mites, which were thought to be possibly the adults of "chiggers." 

 Careful study has been given to these mites as pests of wild game 

 birds. The work has progressed so far that it seems now that we 

 will be able to complete it during the coming summer. As soon 

 as the life history of the mite is completely worked out we will 

 be in a position to recommend remedial measures. A\'e have been 

 slow in prosecuting the above subjects because of the small amounts 



