34 DIPTERA OF MINNESOTA. 



The Circular-Seamed Flies. Flies in which the pupa escapes 

 from the larval skin through a circular orifice made by 

 pushing off the head end of it (Fig. 17). Adults with a 

 frontal lunule. Sub-order Cyclorrhapha. 

 Cyclorrliapha zvithout a frontal suture (Aschiza). 

 The Surphus Flies, Family Syrphidae, p. 98. 

 The Big-eyed Flies, Family PipunculidaE, p. 102. 

 The Flat-footed Flies, Family PlatypezidaE, p. 102. 

 The Hump-backed Flies, Family Phorida, p. 103. 

 Cyclorrhapha with a frontal suture (Sciiizopiiora). 

 Normal Schizophora. 



The Thickhead-flies, Family Conopidae, p. 103. 

 The Bot-flies, Family Oestridae, p. 125. 



The Muscids, Division Muscidae (Families. BorboridaE, p. 105; 

 Agromyzidae, p.' 105; Geomyzidae, p. 105; OsciNiDAE, p. 106; 

 Drosopiiilidae, p. hi; Epiivdridae. p. 112; Diopsidae, p. 113; 

 Sepsidae, p. 114: Micropezidae, p. 115; Psilidae, p. 116; Orta- 

 LiDAE, p. 116; Trvpetidae, p. 117; S APROMYZiDAE, p. ii8; Rhopal- 

 OMERIDAE, p. 119; Helomyzidae, p. 119; Heteroneuridae, p. 



119; SCIOMYZIDAE, p. 120; PhYCODROMIDAE, p. 121 ; SCATOMYZIDAE, 



or ScATOPHAGiDAE, p. 121; Anthomyidae, p. 122; Oestridae, p. 

 125; Sarcophagidae, p. 141; Muscidae, p. 143: Taciiinidae. p- 

 156; Dexiidae, p. 159). 

 The Pupa-Bearing Flies (Pupipara). 



The Louse-flies, Family Hippoboscidae. p. 159. 

 The Bat-ticks, Family Nycteribiidae, p. 164. 

 The Bee-louse, Family Braulidae, p. 164. 

 It has been our aim to make this a treatise on Minnesota species 

 of Diptera. Where we have departed from this principle, indica- 

 tion is made in the text. We have made use of numerous draw- 

 ings of Dr. Lugger's, which were found here. A few of them do 

 not represent species which are at present in our Minnesota collec- 

 tion. We have further included amongst the Minnesota species 

 some specimens labeled "South Dakota," since, although we have 

 not yet met them here, they probably occur within our state 

 boundaries. In every such case, however, the designation "So. 

 Dak." follows the insect's name. Inasmuch as we are still working 

 with soiue Dipterous material as this report goes to press, in all 

 probability new species will be added to our list later. Therefore, 

 anyone desiring a more extended list of our Diptera should write 

 us six months from now. It is planned to include the names of 

 flies not yet listed, in next year's report. 



