SY8 Canadian Record of Science. 



dyke, extends from the water up to the crest of the hill. 

 The Innuits of Koviak Peninsula, near Bering Strait, 

 make many tools of the same stone obtained from moun- 

 tains in the immediate neighbourhood. 



In southern Alaska, from Norton Sound to near Bristol 

 Bay, the mineral is altogether, or nearly altogether, un- 

 known to the natives. On Bristol Bay, however, fine pieces 

 obtained by Mr. McKay, indicate another locality in that 

 district. 



On the Siberian shore of Bering Straits, fragments are 

 rare, and were said to come from the American side. 



Canadian Orthoptera. 



By F. B. Caulfibld. 



To the order Orthoptera belong the insects known to us 

 as Crickets, Grasshoppers, Locusts, "Walking-sticks or Spec- 

 tres, Cockroaches, and Earwigs. These insects are active 

 during all their stages, the principal difference between the 

 larva and adult insect being that of size, and in the greater 

 number of species, the presence of wings. They are vora- 

 cious eaters, and have the mouth parts highly developed, the 

 mandibles being fitted for both cutting and grinding. 



Under favourable conditions, such as a succession of hot 

 and dry seasons, some species of locusts, (Acrididce) multi- 

 plying to an almost inconceivable extent. Leaving their 

 breeding grounds in vast swarms, and swept along by 

 favouring winds, they at times travel to great distances, 

 and wherever they alight, devour every green thing. 



In general, however, orthopterous insects are timid 

 insects and of feeble powers of flight. In fact, many 

 species can only sustain their flight for a few yards, while 

 some are entirely wingless. 



If we examine an orthopterous insect, we will find it to 

 be an apparently helpless creature, its mandibles not being 

 sufficiently powerful to inflict a wound, and its means of 

 defence, when captured, being limited to the discharge of a 

 dark colored fluid from the mouth. A few kinds conceal 



