THE CANADIAN ENTOMOLOGIST 341 



slightly brown, especially along posterior margin; on each of the 

 brown segments there are two small faint pale oblique, slightly- 

 curved streaks, and a pale dot posterior to each. Ventrally, the join- 

 ing of segments brown. Setae slightly tinged with brown, with tips 

 darker brown and a brown band beyond the middle; lateral setae 

 fringed on inner sides only. Legs pale; femora banded with brown 

 about middle; tibiae and tarsi darker toward distal ends; each claw 

 with a lateral row of sectinations. 



Cloeon duhium Walsh. 



The imagos I have agree with the description in Eaton, except 

 that the intercalar veins are single, not in pairs. Adults were 

 numerous at Station Island about July 10th, flying in small swarms 

 along the shore at a height of from 10 to 15 feet. They appeared 

 about 7.45 in the evening. Not many nymphs were taken, collec- 

 tions dating July 30th to August 12th. Imagos were reared July 

 30th and August 2nd. 



Nymph: (PI. VI, fig. 7). 



Measurements — Body 4-4.5 mm.; setae 1.5 mm. Face vertical, 

 with two large pale areas above antennae; between eyes a large 

 pale area, partly divided into two parts, and containing two brown 

 stripes. Notum brown, with irregular light areas. Dorsum of 

 abdomen brown, except lateral margins, which are colourless; on 

 each segment there are two small, oblique, pale streaks and two 

 round dots posterior to the streaks. Setse pale, with brown band 

 toward distal end; lateral setae fringed on inner sides only. Gills 

 double apparently on segments 1 and 2 only; broader than gills of 

 Bcetis; a main trachea in each slightly to outer side, and branchlets 

 on inner side only. Legs pale ; femora banded with brown in distal 

 half; tibiae and tarsi brown toward proximal ends; claws compara- 

 tively long, sharp-pointed, not pectinated. 

 CaUibcetis ferruginea Walsh. 



Imagos, subimagos and nymph skins of this species were col- 

 lected in Toronto by Dr. E. M. Walker, who kindly handed them 

 over to me. The date would be about August 20th. None were 

 taken at Go-Home Bay. 



I am very grateful to Dr. Anna H. Morgan, Mount Holyoke 

 College, So. Hadley, Mass., for the identification of a number of 

 species for me. 



