THE CANADIAN ENTOMOLOGIST. 387 



E. Genital valves 4 mm. or more in length ; valvular proc- 

 esses as long as dorsum of seg, 10 (2 mm.) ; appendages 

 rarely less than 2 mm. broad ; proximal third broad with 

 convex margins, expanding rapidly, so that the greatest 

 breadth is reached before the middle, distal half gradu- 

 ally tapering to a more or less acute apex; no black 

 line on the fronto-nasal suture. 



F. First lateral thoracic band with the front margin 



distinctly sinuate, the upper end giving off caudad 

 a small spur ; second band suddenly expanding at 

 upper end ; length of abdomen without appendages 

 less than 45 mm , of ovipositor 6 mm., of 

 appendages 6-7.5 nim.; apices 

 acute .• 6. cofistricta Say. 



FF. First lateral thoracic band with the front margin 

 straight, or nearly so, gradually tapering dorsad, 

 not giving off a distinct posterior spur ; second 

 band not suddenly widened above ; length of 

 abdomen 45 mm. or more, cf ovipositor rather 

 less than 5 mm., of appendages 7.5-9.5 mm.; apices 

 acute or somewhat rounded .15. tiiberculifera^ n.sp. 



EE. Genital valves less than 4 mm. long; valvular processes 

 much shorter than dotsum of 10 ; appendages less than 

 2 mm. broad and, except in Ae. siichensis, slender, the 

 margins nearly straight in the proximal third, broadest 

 beyond the middle, the apices rounded. 



G. Abdomen at least 40 mm. long ; first lateral 



thoracic band never sigmoid nor bent by alternate 

 angles. 

 H. A black line on the fronto-nasal suture. 



I. Lateral thoracic bands each divided or 

 very nearly divided into a superior and 

 an inferior spot .... 7. i?ite?-rupta, n. sp. 



II. Lateral thoracic bands entire. 



J. Lateral thoracic bands nearly straight, 

 the anterior margin of the first band 

 not distinctly sinuate. 



