DIPTERA OF MINNESOTA. 



101 



constructed that they spear their prey, as it were, sucking their body 

 juices and thereby destroying hundreds of these troublesome pests. 



^ he 



Fig. 97. Allograpta obliqua, imago, larva and pupa. Lugger. Not collected in Minnesota. 



We have at the Experiment Station a large number of pinned speci- 

 mens of this family, so common in this state, representing the following 

 Minnesota species : Chrysochlamys croesus, O. S. ; Criorhina in- 

 tersistens, Walk.; C. verhosa, Walk., Fig. i8, Plate II; Brachypalpus 

 frontosus, Loew ; Syritta pipiens, Linn. ; Sericomyia, sp. ; Eristalis 

 dimidiatus, Wied! ; B. aeneus, Scop. ; E. tenax, Linn., Fig. 9, Plate 

 I; E. meigenii, Wied. ; E. inornatus, Loew, Fig. 9, Plate II; E. 

 occidentalis. Will. ; E. niontanus, Will. ; E. hirtus, Loew ; E. hastardii, 

 Macq. ; E. Havipes, Walk., Fig. 16, Plate I; E. transversus, Wied.; E. 

 latifrons, Loew., So. Dak. ; Helophilus similis, Macq. ; H. conostoma, 

 Will. ; H. chrysostoma, Wied. ; H. latifrons, Loew., Fig. 11, Plate I ; Mi- 

 crodon tristis, Loew. ; M. fuscipennis, Macq. ; Chilosia tristis, Loew. ; 

 Chilosia, sp. ; Paragus bicolor, Fab. ; P. tibialis. Fall. ; Chrysogaster pul- 

 chella, Will. ; Melanastoma mellinum, Linn. ; M. coerulescens, Will. ; 

 Platychirus quadratus, Say ; P. hyperboreus, Staeg. ; Syrphiis arcuatus, 

 Fall. ; S. ribesii, Linn. ; S. grossulariae, Meig. ; S. amalopis, O. S. 

 S. americanus, Wied. ; vS*. diversipes, Macq. ; 6'. xanthostoma. Will., So. 

 Dak. ; Sphaerphoria, sp. ; S. cylindrica. Say, on cabbage aphis ; Meso- 

 gramma marginata. Say. ; M. geminata. Say. ; Xylota ejuncida, Say. 

 X. pigra, Fab. ; X. vecors, Loew ; Chrysotoxum derivatum, Walk. 

 Chrysotoxum, sp. ; Temnostoma alternans, Loew; Fig. 11, Plate I 

 T. aequalis, Loew ; Spilomyia quadrifasciata, Say ; Trophidia quad- 

 rata, Say, So. Dak. ; Pipeza piilchella, Will. ; Neoascia globosa. Walk. ; 

 Rhingia nasica. Say ; Triodonta ciirvipes, Wied. ; Spilomyia fusca, 

 Loew; Mallota posticata, Fab. 



