186 THE CANADIAN ENTOMOLOGIST 



I have observed the adults performing in this manner in Fall 

 Creek and Coy. Glen here at Ithaca and in the Salmon River at 

 Truro, N. S. Guided by the activities of the adults I was not 

 long in finding the eggs. They are laid in masses on the under 

 side of stones, usually in the swiftest water. I have found these 

 egg masses in shallow streams and also in rivers where the water 

 was several feet deep, the current often so swift as to render 

 footing difficult. The females when engaged in egg laying are very 

 sluggish and never attempt to escape. One may easily observe 

 the egg-laying process if he is careful to remove the stone on 

 which the eggs are being deposited. Egg laying was common at 

 Ithaca on June 25, 1911, at Truro, N. S. on July 14, 1913. 



The eggs are deposited in a single, irregular layer. They are 

 placed closely beside one another, often forming a layer of con- 

 siderable extent (Fig. 2). At first the eggs are bright orange in 

 colour, soon turning lemon yellow. They are firmly held together 

 and to the stone by a tough, hyaline substance. In examining 

 an egg mass removed from a stone, each egg is seen to be placed 

 in the centre of a gelatinous envelope, hexagonal in outline. A 

 layer of lemon-yellow eggs, each egg placed in the centre of its 

 gelatinous envelope, presents a rather beautiful appearance, (fig. 

 l). The eggs are practically spherical in shape, measuring .18 mm. 

 to .2 mm. in diameter. Some eggs may be a little larger, others 

 smaller, but the above measurements represent the average size. 

 The eggs are perfectly smooth without markings of any kind. 



I was not able to rear the larvae from the eggs nor study in 

 detail their natural history. It would undoubtably be of consider- 

 able interest for any one to study the form of the larva at hatch- 

 ing and what changes it undergoes during its larval existance. 

 No one I believe has examined the stomach contents and 

 nowhere have I found mention of its feeding habits. I did not 

 determine the time between egg laying and the hatching of the 

 larva. Judging from observations, the life-cycle lasts slightly less 

 than a year, — egg-laying taking place during the latter part of 

 June and July, the larvae reaching maturity the following season. 



In the references to this species in literature I have found 

 but one note on the pupa. Hubbard in the American Entomol- 

 ogist for 1880, p. 73, speaks of the larva leaving the water and 



