120 dipTera of MINNESCTA. 



Aldrich lists fourteen North American species, but six of these 

 are from the West Indies, and at least four others are of doubtful 

 authenticity. 



SCIOMYZIDAE. 



These are brownish black or yellowish flies, sometimes with 

 strikingly marked wings, found in moist localities, such as meadows 

 or along the banks of streams. The larvae are aquatic. Some of the 

 species are minute in size, and others, like Tetanocera plumosa, are at 

 least two-thirds of an inch long. Aldrich lists 64 species in North 

 America, secured in the White Mountains, Canada, Alaska, Middle 

 States, Texas, Nova Scotia, New Mexico, New York State, Connecti- 

 cut and elsewhere, showing the family to be of general distribution. 



EXPLANATION OF PLATE IL 

 (Figures are natural size unless otherwise stated.) 



1. Pyrgota undata, Wied., Ortalidce. 



2. Coenomyia ferruginea, Scop., Leptida. 



3. Pachyrhina ferruginea, Fab., Tipulidce. 



4. Sargus decorus, Say, slightly enlarged, Stratiomyidce. 



5. Myopa clausa, Loew, slightly enlarged, Conopidoc. 



6. Tachina robusta, Town., slightly enlarged, Tachinidce. 



7. Tabanus giganteus, De G., TabanidcB. 



8. Stratiomyia discalis, Loew, slightly enlarged, Stratiomyidce. 



9. Eristalis inornatus, Loew, slightly enlarged, Syrphidce. 



10. Dasyllis sacrator, Walk., slightly enlarged, Asilidcc. 



11. Temnostoma alternans, Loew, slightly enlarged, Syrphidce. 



12. Chrysotoxum sp., slightly enlarged, Syrphidce. 



13. Plecia heteroptera, Say, slightly enlarged, Bibionidce. 



14. Chironomus sp., slightly enlarged, Chironomidce. 



15. Mydas clavatus, Drury, Mydaidcc. 



16. Bombyliomyia (Hystricia) abrupta, Wied., Tachinidcv. 



17. Exoprosopa decora, Loew, slightly enlarged, Bombyliidcc. 



18. Criorhina verbosa. Walk., Syrphidce. 



19. Nemotelus uliginosus, Linn., twice enlarged, Stratiomyidce. 



20. Euparyphus bellus, Loew, twice enlarged, Stratiomyidce. 



21. Laphria sericea. Say, Asilidce. 



