THE CANADIAN ENTOMOLOGIST. S3 



ing, and finally they all died, none of them being more than half grown. 

 This was about July 5th, and about this time I found a number of the 

 larvae about some raspberry canes in a shady place, and on July 1 3th I 

 took more of them among low juicy grasses and thistles, growing thickly 

 in a cool, moist place, several rods from any trees of any kind. On July 

 17th, nearly all these larvae changed to the adult form. 



The larva becomes much elongated as it begins to cast the last en- 

 velope, and one of them, noticed when just beginning the operation, took 

 three hours to complete it. 



The full grown larva is about 8 m.m. in length, and light green in 

 color, somewhat lighter than that of the mature insect. The young larvae 

 appeared to be of a darker green than they were at a later period of their 

 growth. The general shape is triangular, like that of the mature insect, 

 but the broad horn-Hke projections are not seen in the larva. The eyes 

 are prominent. On the front of the elevated thorax, and behind each 

 eye, are two short, strong spines, one above the other, armed with several 

 lateral prongs or forks ; higher up, near the apex of the triangular shaped 

 throax, are two more, somewhat larger armed spines, and the last two 

 visible thoracic segments are each provided with a pair of these branching 

 spines that are still longer. There is also a pair of these spines, each 

 armed with about 6 or 7 barbs, on each of the abdominal segments next to 

 the terminal. These are graduated in length, the shortest being on the last 

 segments, and the longest hardly more than a millimeter in length. The 

 thoracic spines project forwards, while those on the abdominal segments 

 are drawn forward at the base and then curve back, strongly suggesting 

 the dorsal fin of a fish. On the last segment, which is long and tapering, 

 there are two short armed spines directly above the anal opening, which 

 is terminal. The ventral surface of the abdomen is scatteringly covered 

 with short, strong bristles or hairs. The. legs are also covered with stiff 

 hairs. 



The eggs, in batches of from 5 or 6 to a dozen (rarely more), are de- 

 posited obliquely in the bark, and often the incision continues into the 

 wood, if the bark is thin. In this way the bark and wood become 

 fastened together, and will not separate at any season, and the dark spots 

 in the wood and the rough knotty bark bear evidences of the injuries for 

 many years. 



The eggs are of a dirty transparent white, about 1.5 m.m. in length, 

 smooth, slightly tapering, and sharply rounded towards the interior end, 



