352 Report of the Entomologists of the . 



body gradually assumes the characteristic wedge shape, but to a 

 less degre than with many species of saw-flies. 



The full-grown larva. — Length about 18 mm.; body tapering, 

 broadest on anterior third where it measures 2.1 mm. Color 

 light yellowish green to darker shades, usually imitating the color 

 of the leaf upon which it is feeding. Head darker with distinct 

 nearly round eye-like spot on either side and sparsely covered with 

 long white hair. Mandibles black at tips; prolegs on joints 6-13. 

 Body covered with spine-bearing tubercles arranged in double 

 transverse rows. In each double row the anterior dorsal tubercles 

 bear two spines and the posterior three. 6 Two dorsal tubercles 

 on the first segment of the thorax bear 5; all the lateral tuber- 

 cles bear 1 and 2 spines. Dorsal spines very dark or black, lateral 

 spines pale green or white. The anal plate bears six simple and 

 two bifid spines. (Plates XXVII, Figs. 1, 2 and 3.) 



Habits of the larva. — The newly-hatched larvas feed on the soft 

 parts of the leaf but are soon large enough to eat oblong or ir- 

 regular holes through the leaf. Finally, as previously stated, the 

 entire leaf is devoured with the exception of the midrib and 

 larger veins. When at rest upon the upper surface of the leaf 

 they are quite inconspicuous owing to the similarity of color of 

 the body and leaf. They continue feeding for 10 days or more, 

 finally going into the ground to pupate. 



Pupation. — Pupation takes place during the latter part of June. 

 Last year nearly all of the larvae in a badly infested field of rasp- 

 berries near the Station had gone into the ground by June 29. 

 When ready to pupate the larvae crawl down the canes and wan- 

 der about for a time, apparently seeking a suitable place to enter 

 the ground. Some of them enter the ground close to the canes 

 but large numbers were observed to go 2 or 3 feet from. 



6 From other descriptions principally by Saunders (Ont. Ent. Soc. Ann. 

 Rpt., 1873, p. 12) it appears that there may be exceptions to this arrange- 

 ment, but in nearly 30 specimens examined by the writer no exceptions were 

 observed. 



