THE CANADIAN ENTOMOLOGIST 333 



frequently attempted copulation with the male Hexagenia, ap- 

 parently being deceived by the colour. 



Subfamily — Baetince. 

 Baetisca ohesa Walsh. 



The very interesting nymphs of this species were quite abun- 

 dant along the north-east shore of Giant's Tomb Island, on May 

 26th. The shore is rather sandy, with numerous small stones, and 

 deepens very gradually. The nymphs were clinging to the stones 

 in water 3 to 15 inches djep. Imagos did not emerge from this 

 collection until July 13th. 



Leptophlehia sp. ? 



A single almost mature nymph was taken on July 21st in quiet 

 water at the side of an old lumb r chute, but it died before tim.e 

 of emergence. 



Blasturits ciipidus Say. 



This is an early species, mature nymphs being found May 

 25th, and subimagos appearing May 31st. A small nymph, col- 

 lected May 31st, was observed to he filled with small, oval, brown- 

 ish bodies. Upon dissection by Mr. A. R. Cooper, these were found 

 to be the eggs of a trcmatodc, and in the midst of them was the 

 trematode itself, which belonged to the genus Halicometra. An- 

 other nymph, taken some tim^e afterwards, was also discovered to 

 be parasitized. 



Blasturus nehiilosiis Walker. 



The nymphs and imagos of this species were first taken June 

 9th, on a small, bare, granite island a short distance out in the 

 open bay. On top of this island were numerous pot-holes of all 

 sizes, and in these, under loose pieces of rock and some rubbish the 

 nymphs were very abundant, having tadpoles, chironomid larvae 

 and water beetles for associates. Many nymphs were covered 

 with VorticeUa. Several nymphs were obs rved to crawl out of 

 the water and transform on the rock just above ths surface of the 

 water. Subimagos were clinging to the sides of the rock in sheltered 

 places, and a few imagos were flying above the pools. This species 

 was again observed on June 27th, on an island five miles from the 



