14 University of Michigan 



several of the other stations it was found among the emergent 

 vegetation, running about on the surface of the water. A 

 single winged specimen was taken. 



Family Mesoveliidae 

 A single species occurs in Michigan. 



Gexus ^NIesovelia ^Iulsaxt and Rev 



9. Mcsoz'clia niiilsaiiti l\. White. A])undant on the weed- 

 grown pools and ponds in the Douglas Lake region, and es- 

 pecially at home around the floating leaves of the Potamogetons 

 and water-lilies. All the specimens secured were apterous. 



Family Saldidae, the SHOKE-r.uGs 



Key to flic Genera of Saldidae of the Dmtglas Lake Region 

 Pronotum conical, much narrowed anteriorly, lateral margins 



straight Sai.da 



Pronotum not conical, less narrowed in front, lateral margins 



strongly arcuate Sai.dula 



Genus Salda Fabricius 



10. Salda coriacca Uhler. Rare in this region. Two s[)eci- 

 mens were taken with the next species by sweeping sedges near 

 the open water at Smith's Bog (Sta. XII) on July 29, 1918. 



Genus Saldula Van Duzee 



11. Saldula pallipcs (Fabricius). This shore-bug was 

 found fairly commonly among the scanty vegetation along the 

 east beach of the lake (Sta. II), and along the sandy flats be- 

 side Maple River (Sta. VIII). It was also taken occasionally 

 by sweeping the bulrushes and sedges at several of the beach 

 pools; but by far the largest single catch of this species (27 

 specimens) was made at Station XII on July 29, both by 



