254 THE CANADIAN ENTOMOLOGIST 



30 and several small specimens from Sandy Gray Falls, August 23. 

 Imagos were reared from June 27 to July 3. 



Heptagenia fiisca, sp. nov. 



Male imago. 



Measurements: Body, 10 mm.; wing, 13; setje, 26; No mark- 

 ings on face; ocelli almost in a straight line, the middle one the 

 smallest. Pronotum brown, slightly darker along the median line; 

 mesothorax uniformly brown. Abdomen with posterior one-third 

 of each segm.ent of same brown colour as thorax and projections 

 from this band anteriorly in the median line, almost forming a con- 

 tinuous longitudinal stripe on the abdomen; the band widens later- 

 ally also; remaining portions of each segment somewhat light 

 brown; ventrally very slightly banded. Forceps and penis lobes 

 of usual form. Femur banded in middle and at distal end. Wings 

 large; costa, subcosta and radius light in colour, while remainder of 

 longitudinal and the cross veins brown. No cloud in pterostig- 

 matic space. 



Female imago. 



Measurements: Body, 10-12 mm.; wing, 14 mm.; setae, 18; 

 Quite similar to male, except that abdomen is considerably darker. 



Nymph. 



Measurements: Body, 12-14 mm.; setae, 15-20; antennae, 3. 

 Head brown, dotted with light spots; usually three light areas at 

 posterior margin between eyes and two lateral to each eye ; anterior 

 margin well fringed with hairs. A light longitudinal median line on 

 pronotum; two light areas on each side and lateral margin colour- 

 less; remainder of pronotum brown, with small light dots. Pos- 

 terior one-third of each abdominal segment 6-10 almost black; seg- 

 ments 1-6 brown; the remainder of each segment varying from light 

 brown to greenish yellow; ventrally posterior one-fourth of each 

 segment 2-8 brown; ninth segment has two dark areas laterally. 

 Femur light brown on upper surface, with a few lighter areas and 

 covered with minute spines dorsally; posterior margin fringed with 

 hairs; proximal end of tibia dark brown and its third quarter dark; 

 proximal half of tarsus dark. Setae well fringed with hairs at the 

 joinings. 



While on a canoe trip up the Go-Home River, June 16th, I 

 collected a number of the nymphs of this spaces just below Sandy 



