TPIE CANADIAN ENTOMOLOGIST. 259 



e^ach antenna, and another about the same size in front of each eye, 

 a. black dot behind each lateral ocellus; a light area in front of 

 median ocellus, and a larger light area between each lateral ocellus 

 and eye; another lateral to each eye along margin of head. Mouth 

 parts of the type belonging to group 2. Pronotum reddish brown, 

 with a dark and an approximate light area in each lateral half; 

 margin colourless. Abdomen darker than thorax; each segment 

 with four light longitudinal streaks, two near median line and the 

 other two near lateral margin; black dots, corresponding to the 

 stigmal dots just inside the lateral light streaks. Ventrally the 

 abdomen is almost white, each segment has two light brown lateral 

 streaks, while the 9th has its lateral and posterior margins margined 

 with light brown. Short lateral spines at posterior lateral angles 

 of segments 8 and 9. Seta? of equal length; light brown in colour; 

 joinings fringed with hair. Gills oval and pointed. Femur of 

 fore leg light brown, with four light areas; tw^o small ones toward 

 anterior margin and two large ones toward posterior; distal end 

 light coloured. Femora of hind legs with fewer pale markings. 

 Tibiae alternately banded with brown and white; tarsi have very 

 broad median bands; legs slightly hairy along posterior margin. 



This species was very abundant at Go-Home Bay, being next 

 in numbers to H. tripiinctata. The nymphs were taken from May 

 25th to July 10th in various localities, but*never in swift water, the 

 usual place being quiet bays. Small nymphs of the next generation 

 were found on September 5th. The first bred specimen is dated 

 June 1st and the last July 4th. Imagos were most abundant at 

 Station Island from June 25th to July 15th. 



Heptag^nia frontalis, Banks. 



Nymph. 



Measurements: Body 9-10 mm.; setae 9-10; Head yellowish 

 brown in colour; three almost round light spots along anterior 

 margin of head; usually a light area in front of each ocellus, and 

 another along median line between eyes and two smaller ones 

 lateral to this along posterior margin of head. A black dot below 

 each antenna, in front of each eye and near inner margin of each 

 eye. Thorax lighter in colour than head; on each side of prono- 

 tum, near median line, is a small light spot; just lateral to this is a 



