346 ECONOMIC ENTOMOLOGY 



Imported Currant Worm {Pteronus ribesii Scop.). — Adults, Four- 

 winged saw-flies, }^ inch long; female with light yellow abdomen marked 

 with black; male smaller and darker; May and July. 



Eggs. — ^Laid in rows on leaves along the mid-ribs; hatch in 4 to 

 10 days. 



Larva. — At first the caterpillar is whitish and with white head; 

 after first moult the body is green with black spots on side of body. 

 When full grown, ^ inch long, they lose their black spots and descend 

 to ground to pupate. Two or three weeks. 



Pupa. — Formed in an oval brownish silken cocoon on the surface of 

 the ground. Pupa of second brood winters over. 



Life-history. — Two broods a year; adults emerge in spring and 

 again in July. Broods overlap. 



Control. — Dust or spray with hellebore or with an arsenical poison. 



Larch Saw-fly {Lygceonematus erichsonii Hartig.). — (Consult Bull. 

 ID, Div. Ent. Dep. Ag. Can.) A serious pest of larch introduced from 

 Europe. 



Adult. — A large thick black saw-fly, with second, fifth and part of 

 sixth abdominal segments bright red. April-May. 



Eggs. — Laid in slits in terminal shoots June-July; white, cylin- 

 drical, tapering at each end; J^^q inch long; hatching in 8-10 days. 



LarvcB. — Feeding on leaves in June-July; mature in 20 days when 

 they descend to ground and spin cocoons; hibernate. Full grown 

 larvae with jet-black head and glaucous green body. About each 

 segment, except second, double parallel rows of minute dark dots; five 

 moults. 



PupcB. — In dark brown, oval, elongated cocoons, % inch long, 

 beneath the surface. 



Parasites. — Pteromalus nematicidus Pack., a chalcid, and Mesoleius. 

 tenthredinidis, an ichneumonid. 



Birch Saw-fly {Hylotoma pectoralis Leach). — Defoliates birches 

 in Quebec and Prince Edward Island, while Fir Saw-fly {Lophyrus 

 abietis Harr.) and Abbott's Pine Saw-fly (L. abbotii Leach) do damage 

 to firs and pines respectively. 



Raspberry Web Worm {Pamphilius fletcheri MacG.)— Injurious 

 in New Brunswick. 



/I (/i J/.— Three-eight inch long; head and thorax black with white 

 markings. Abdomen of male black with a broad median transverse 



