368 THE CANADIAN ENTOMOLOGIST 



surface of 2, but not forming distinct spots in the specimens studied. 

 Base of 3 with lateral yellowish patch extending from dorsal to 

 ventral surface. Segs. 4 to 8, each with a roundish, baso-lateral 

 spot becoming small on 8. 



Appendages. — The form of these is shown on pi. X, figs. 2b, 2c. 

 In dorsal view the superior appendages appear widest at the base, 

 where they are close together, subparallel in proximal half, the apical 

 inward curve nearly as in semicircularis but not quite so regularly 

 arcuate. In profile they are straight, lateral carinae percurrent, in- 

 ferior carinse gently arcuate towards base, slightly bent outward, but 

 not visible from above; ventro-lateral prominence well marked, 

 barely seen from above (probably not in all cases) ; apices acute, 

 slightly carinate above, the extreme tips somewhat decurved 

 (perhaps in drying). Inferior appendage about half as long as 

 superiors, triangular, apex bluntly pointed, with a well-marked 

 recurved spine. 



Female. — Similar in coloration to male. Seg. 2 is entirely 

 castaneous, except a very small lateral spot and an apical ring, 

 which are pale brownish grey or drab. The underside of 3 is also 

 of about the same colour. The yellow spots on the other abdominal 

 segments are usually larger than in the cf , and often diffusely 

 prolonged caudad. 



The wings as usual show considerable variation in colour but 

 are typically hyaline, each with two basal, amber, yellow streaks, 

 and a yellowish cloud occupying the distal half, or less, of the wing 

 and deepest about the pterostigma. In some individuals the 

 entire wing is flavescent, but even in these the basal streaks appear 

 deeper than the rest of the wing. 



In most of the specimens the abdomen is broadest at base and 

 tapers fairly regularly to near the caudal extremity, but, as in 

 other species, its form varies with age, younger individuals being 

 more depressed and regularly tapering, older ones more cylindrical 

 and laterally constricted at seg. 3. 



The vulvar lamina is elongate, extending in all the specimens 

 well beyond the distal margin of the 9th sternite, as far as that of 

 10 or even a little farther. It is horizontal, trough-shaped, the 

 sides slightly convergent, apex broadly rounded, . upper edges 

 before the apical curve slightly arcuate. Inferior surface in profile 



