194 THE CANADIAN ENTOMOLOGIST 



E. calverti, differing from that of E. hageni, E. ebrium, Ischnnra 

 verticalis and Ccenagrion rcsolutum in the somewhat more prominent 

 eyes and postcro-hiteral surfaces of the head, these parts ha\ing a 

 somewhat more strongly sinuate outline in dorsal \'iew (cf. Can. 

 Ent., t .c, figs. 4, 6). Labium of the usual form in this genus, 

 the lateral margins in about the proximal two-thirds straight 

 and diverging at an angle of about 30°, in the remamder at about 

 70°, breadth at the base of lateral lobes four-fifths of the length; 

 mental seta? 4. sometimes 3 on one or both sides, lateral setai 6; 

 lateral lobes of the usual form, the end-hook preceded b\' 2 or 

 3 teeth, which are preceded by a more or less denticulated and 

 incurved margin. Spinules on lateral margins of abdominal seg- 

 ments of moderate size, forming an irregular single (jr partly 

 double series and not increasing much in size near the postero- 

 lateral angles. 



Gills long and relatively narrower than in E. hageni, the 

 margins of a little less than the proximal half spinulose, the spinules 

 somewhat coarse, particularly on the dorsal margin of the median 

 gill and the ventral margins of the lateral gills, distal margins 

 with moderateU' long slender hairs; apices convexo-angulate or 

 rounded. The greatest breadth is just before the distal end of 

 the spinulose margins, measuring between one-fourth and one- 

 fifth (median gill) or one-fifth and one-sixth (lateral gills) of the 

 length. Beyond this point the gills are suddenly, though slightly, 

 narrowed. 



The lateral appendages (superior appendages of adult) dififer 

 in form in the two sexes. In the male, they are rounded and some- 

 what depressed, in profile about half longer than deep, and, when 

 viewed obliquely from above, they present a distinct, though 

 shallow, dorso-caudal conca\ity; \icwed directly from above, 

 they appear about as broad as long with convex margins, especially 

 the outer. In the femg^le, these appendages are subpyramidal, 

 tapering to a blunt apex, the outer margin in dorsal view nearly 

 straight, the inner margins somewhat more convex toward the 

 base. 



Colour — Olivaceous or brownish-green (brownish-yellow in 

 alcoholic specimens), generally nearly uniform, f)ut frequently 

 more or less speckled with dark irregular spots, the abdomen 



