252 THE CANADIAN ENTOMOLOGIST. 



Heptagenia flavescens, Walsh. 

 Nymph. 



Measurements: Body 8-9 mm.; setae 10-13 mm. Head brown, 

 very shghtly covered with Hght dots; a Hght spot above each ocellus; 

 a small light dot on each side of median ocellus; an irregular light 

 area anterior and lateral to each eye. Pronotum brown, with two 

 light spots on each side. Mesothorax similar in colour to prothorax. 

 Abdomen of a uniform brown colour dorsally, having a smooth ap- 

 pearance; lighter ventrally, with a semicircular browm band on 9th 

 segment and a median browm spot on 8th. Spines of lateral edge 

 short. Setae banded, usually three segments dark and one light, 

 sparsely fringed, usually only at base of light segment. Femora 

 much flattened, brown and dotted with light spots, and having three 

 irregular light bands; covered dorsally with small spines and pos- 

 terior margin fringed with hairs and spines. Tibia with median 

 and distal light bands. Tarsus tipped with w^hite. Claws with 

 two pectinations. 



The nymphs of this species were taken up the Go-Home River 

 on June 16, 1912, immediately above Flat Rock Falls, where the 

 water was flowing swiftly but smoothly. They were clinging to 

 stones in water one to one-and-a-half feet deep not far from the 

 shore. On the same date they were found just below Sandy Gray 

 Falls, two miles farther up the river. Here the water was swift and 

 rough. I was successful in rearing only two specimens, the dates 

 being June 27 and July 3. 



Heptagenia lufea, sp. nov. 



Male imago. 



Measurements: Body, 9-10.5 mm.; wing, 10.5 mm.; seta?, 20; 

 fore leg, 10. 



This is a light-coloured species, slightly reddish on face below 

 antennae; reddish brown between ocelli and eyes. Thorax almost 

 whitish yellow dorsally, light yellowish brown laterally; a dark 

 area on each side of pronotum, slight red and brown markings 

 below bases of fore and hind wings. Each abdominal segment 1-8 

 banded dorsally at posterior margin, remaining part of these seg- 

 ments being almost white; segments 9 and 10 entirely reddish 

 brown; stigmal dots not marked; wrings clouded in pterostigmatic 



