AKT. 10 THE FAMILY SIMULIIDAE DYAK AND SHANNON 13 



This tooth larger, the arm half or more encircling genital opening. 



f minus, new species. 



Tooth moderate { , „„. 



I clarum, new species. 



Tooth large. 



Mesopleural membrane with tuft of pile boreale (Malloch). 



Mesopleiiral membrane bare canonicohim, new species. 



Tooth very large, forming a lateral arm johannseni (Hart). 



Lateral arms of genital rod without tooth, widely and quadrately expanded. 



alticolum, new species. 



TABLE OF .SPECIES OF EDSIMULIUM IIOUBAUD 



(Based on external characters) 

 ('laws simple. 



Hind tibial spurs unusually long; hind basitarsus with a prominent projec- 

 tion ; hind second joint with a slight dorsal incision. 



Eastern North America mutatum (Malloch). 



Western North America permutatum, new race. 



Hind tibial spurs moderate ; hind basitarsus with very slight projection ; the 



following joint without dorsal incision frisoni, new species. 



Claws with basal tooth ; hind tibial spurs normal ; hind second tarsus with 

 dorsal incision, except pecuarum. 

 Postnotum with brassy scales; mesonotal pile brassy, .scalelike. 



aureum (Fries). 

 Postnotum without brassy scales ; mesonotal pile not brassy, except uiexicanum. 

 Thoracic integument yellow with silvery pollinose stripes. 



Without brownish stripes ochraceum (Walker). 



With brownish stripes in addition callidum, new species. 



Thoracic integument not yellow. 



Mesopleural membrane with tuft of pile boreale (Malloch). 



Mesopleural membrane bare. 

 Antenna elongate, distinctly larger than fore basitarsus ; integument 



brownish alticolum, new species. 



Antenna normal, smaller than fore basitarsus. 

 Stem vein pale pilose. 

 Bluish-gray species with yellowish legs. 



congareenarum, new species. 

 Blackish species with blackish legs. 

 Abdominal tergites of general dark gray color (eastern United 



States) johannseni (Hart) 



Abdominal tergites 3, 4, 5, and 6 reduced to small plates, bluish 

 (drier regions of western United States). 



clarum, new species. 

 Stem vein dark pilose. 



Hind basitarsus truncate apically, the ventral line with a small 

 apical spur. 



Stem vein dark pilose (South Dakota) dacotense, new species. 



Stem vein pale pilose (southeastern part of United States). 



pecuarum (Riley). 

 Hind basitarsus with apical projection on inner surface. 

 Tergites 2, 3, 4, and 5 not greatly reduced ; legs black. 



minus, new species. 

 Tergites 2. 3, 4. and 5 greatly reduced; legs bicolored. 



mexicanum (Bellardi). 



