DIPTERA OF MINNESOTA. 



117 



We have taken in Minnesota : Rivellia pallida, Loew. ; R. viridulans, 

 Desv. ; R. hoscii,'Dtsv.; Tefanops integra, hoQ\w.; Chaetopsis aenea, 



Fig. 112. Pyrgota valida. Original. 



Wied. ; Pyrgota undata, Wied., Fig. i, Plate II; P. valida, Harris; 

 Se opt era vibrans, Linn. 



TRYPETIDAE. 



This family contains some gall makers, notably Burosta (Trypeta) 

 solidaginis, Fig. 2 Plate I, which produces the familiar round gall (not 



Fig. 113. Rhagolitis {Trypeta) pomonella, The Apple-Maggot Fly. Original. 



the elongated gall, which is made by a moth) on the stems of the 

 golden rod. The larvae of other species, according to Williston, 

 mine in the leaves of Riimex, Senecio, Arctium, or live in the berries 



