260 THE CANADIAN ENTOMOLOGIST 



triangular dark spot, and lateral to this again is another light area; 

 in anterior angle of pronotum is an oval light spot; along posterior 

 margin extending some distance on either side of median line is a 

 broad light band, which is connected by a light longitudinal stripe 

 along median line of mesonotum to a large irregular light area on 

 the mesonotum. Abdomen usually a light yellowish brown; the 

 colour pattern roughly has the appearance of a broad light band 

 along median line, in which in segments 5, 6 and 7 are oval dark 

 areas; in 8, a narrow stripe, and in 9 a round, dark area in each 

 segment; on either side of this broad light band is a short light 

 stripe; ventral surface almost white, with two lateral light brown 

 longitudinal stripes on segments 1-9; a broad band across 9th along 

 posterior margin, joining the two lateral stripes. Segments of 

 setae alternately light and brown. Legs pale, colour pattern similar 

 to H. canadensis. 



This species was not nearly so abundant as H. canadensis. 

 The nymphs were taken in similar localities, but were not so wide- 

 spread or plentiful. They were found from July 15th to July 2nd 

 and images were reared from June 26th to July 4th. 



Heptagenia ? (undetermined). 



Nymph. 



Measurements: Body, 10-11 mm.; set?e, 12-13.; head, light 

 brown; sometimes three light areas along anterior margin, but 

 frequently the middle one is lacking and the two lateral ones are 

 connected with the light margins lateral to the eyes. An almost 

 black spot in centre of each half of pronotum; around this is an 

 irregular light area, exterior to which is a brown area. Abdomen 

 whitish yellow, with five longitudinal yellowish brown stripes in 

 each segment 1-8. Setae light greenish yellow; joints abundantly 

 fringed with hairs. Legs yellowish brown in colour; pattern similar 

 to the two preceding species. 



These nymphs were collected along the east shore of Mani- 

 toulin Island on June 26th, 1912, by Mr. R. P. Wodehouse, who 

 kindly handed them over to me. As imagos were not reared, the 

 species cannot be determined at present. 



