338 THE CANADIAN ENTOMOLOGIST. 



dredged up from a slightly sandy bottom in water 5 to 15 feet 

 deep, on September 3rd. 



Chirotenetes albomanicatus Needham, 



On July 16th I found a nymph slough at Sandy Gray Falls, 

 on the Go-Home River, but was unable to find either nymphs or 

 imagos. I did not get up to the falls again until August 23rd, and 

 then found the numerous small nymphs of the next generation. 



Siphliirus flexus sp. nov. 



Two beautiful Siphlurus nymphs were taken early in the sea- 

 son, but both died before time of emergence. The first was found 

 May 25th in the bottom of a canoe, when some water was being 

 emptied from it; the other was found June 3rd beneath a stone in 

 about 13^ feet of water along the open, exposed shore of Station 

 Island. Quite a number of imagos, apparently Siphlurus, were 

 captured about this time, and it seemed quite probable that they 

 were the same species as the nymphs. I think I have proved this 

 quite conclusively by the wing venation. The wing of the imago 

 has a very characteristic bend in cubitus 2 at the base, and the 

 wing pad of the nymph shows this bend very distinctly. Again, the 

 imago has claws like Ameletus, the two on each leg being unlike. 

 These two unlike claws can be made out in one of the nymphs, due 

 to the nymph dying just when about to transform. Imagos were 

 captured on May 23rd, May 26th, and June 12th. On the latter 

 date a swarm of 12 or 15 were observed flying off the west point of 

 Station Island, about 5.30 p.m., at a distance of from 12 to 20 feet 

 from the surface of the water. They faced the west, and had the 

 characteristic fluttering rise and leisurely fall. 



Male imago: (PI. VI, figs. 10, 11.) 



Measurements — Body 13-14 mm.; wing 12-13 mm.; setse 23-24; 

 fore leg 12-13. Head blackish brown, except lower part of face, 

 which is tinged with brown; eyes large, meeting dorsally. Notum 

 blackish brown. Sides of thorax marked irregularly with white. 

 Abdominal segments 1, 8, 9 and 10 dark, segments 2-6 lighter in 

 colour; these latter are light toward anterior margin and brown 

 toward posterior; in the median line the brown is dark and forms a 

 triangular area, the apex extending almost to the anterior margin; 

 from the anterior margin in the median line two bands arise, com- 



