92 



DIPTERA OF MINNESOTA. 



Minnesota species so far captured : Thereva frontalis, Coq. ; T. 

 senex, Walk. ; T. duplicis, Coq. ; Thereva, sp. ; Psilocephala haemorrh- 

 oidalis, Macq. ; P. Hmata, Coq. ; P. munda, Loew. 



Fig. 86. Thereva senex. Lugger. 



SCENOPINIDAE. 



71ie Windozv Flies. 



So called because very frequently found in windows, but, as Corn- 

 stock very well puts it in his Manual, "the conclusion that these are 



Fig. 86a. Scenopimis fencstralis, a, imago; b, eggs; c, larva; d and e. pupa. Lugger. 



