DIPTERA OF MINNESOTA. 



Ill 



June, July and August is sometimes very abundant in localities, and 

 attacks horses, cattle, dogs and man, sometimes causing large sore 

 spots on stock as a result of its work. In all the drawings in this 

 report where hair lines occur^ these lines indicate the natural size of 

 the insect. 



Hippelates Havipes, Loew., which Aldrich regards as the same as 

 the above described Oscinis paUipes, Loew, is dealt with at some length 

 in entomological literature. Schwarz writes ("Insect Life," Vol. VIT) 

 of "The Hippelates Plague in Florida," mentioning the fact that the 

 adults annoy people, dogs, etc. Howard, in "Proceedings of Washing- 

 ton Academy of Science," Vol. II, page 590, says they occur on 

 human excrement, and perhaps carry putrefactive germs to open 

 wounds, inducing blood poisoning". 



We have taken in Minnesota: Oscinis soror, Macq. ; 0. pallipes, 

 Loew. ; Meromyza americana. Fitch ; O. carbonaria, Loew. ; O. 

 trigranima, Loew. ; 0. coxendix, Fitch ; O. dorsata, Loew. ; Hippelates 

 convexus, Loew. ; Chlorops assiinilis, Macq. ; Siphonella cinerea, Loew., 

 S. Dak. 



DROSOPHILIDAE 



Fig. 105. Drosophila ainpflof>lula. Lugger. 



