GEORGIAN BAY EPHEMERID^ 135 



SESSIONAL PAPER No. 39b 



yellowish with the tips of the femora fuscous and the tarsal joinings and tips a 

 little cloudy. Fore wing hyaline with a pale ferruginous cloud in the pterostig- 

 matic region; neuration fuscous, excepting the basal § of the costa, subcosta and 

 radius which are yellowish; the thickening at the bulla of the subcosta about 

 0*5 mm. long, is more or less obfuscated. 



Female imago: 



Measurements: Body 8 mm.; wing 10 mm. 



Face clear; thorax yellow, slightly tinged with brown. Abdomen yellow; 

 segments banded along posterior margin dorsally with black; stigmal dots marked. 

 Femora with median and distal ferruginous bands. Most of the longitudinal 

 veins of the fore- wing colourless; cross veins heavy and brown; very slightly cloud- 

 ed in the apical costal space; venation of hind wing almost colourless. 



Nymph: 



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



Head brown, very slightly covered with light dots; a light 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; 

 part of lateral margin. Mesothorax similar in colour to prothorax. Abdomen of a 

 uniform brown colour dorsally, having a smooth appearance; lighter ventrally 

 with a semicircular brown band on 9th segment and a median brown spot on 8th. 

 Spines of lateral edge short. Setae banded usually 3 dark and 1 light; sparsely 

 fringed, usually only at base of light segment. Femora much flattened, brown 

 and dotted with light spots, and having 3 irregular light bands; covered dorsally 

 with small spines and posterior margin fringed with hairs and spines. Tibia with 

 median and distal light bands. Tarsus tipped with white. 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. The nymphs were clinging to stones in water 1 to 1^ feet deep, 

 not far from the shore. On this date they were also found just below Sandy Gray 

 Falls in swift rough water, but close to shore. I was successful in rearing two 

 specimens, but one escaped from the cage over the breeding-jar and could not be 

 found. The remaining one was a female and hence to make the description as 

 complete as possible, I have inserted the description of the male from Eaton. 

 The dates of the two emergings were June 27 and July 3. 



Heptagenia lutea Clemens. 



Male ima,go: ' ^' ^' 



Measurements: Body 9-10*5 mm.; wing 10*5 mm.; setae 20 mm.; fore-leg 

 10 mm. 



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

 tween ocelli and eyes, reddish brown. Thorax almost whitish yellow dorsally; 

 light yellowish brown laterally; dark area on each side of pronotum; slight red 

 and brown markings, beneath bases of fore and hind wings. Each of the abdominal 



