1899] 



ENTOMOLOGICAL SOCIETY. 



63 



-p. 879. 



1889. Lintner— Fifth Rep. N. Y. State-pp. 164-173. 



1890. Packard— U. S. Ent. Com. V. Rep., Forest Insects- 



1891. Fyles— Am. Rep. Ent. Soc. Ont.— pp. 28, 30. 



1893. Harrington— «' —pp. 19, 21. 



" Lintner— Eighth Rep. N. Y. State— pp. 168, 169. 



1894. Fyles— Am. Rep. Ent. Soc. Ont.— pp. 4, & 



1896. Marlatt — Revision of the Nematinae of North America— pp. Ill, 112. 



1898. Hutt— Am. Rep. Ent. Soc. Ont.— p. 94. 



Lydasj). ; (Colorado Spruce Saw- Fly.) On May 30th several black saw-flies were 

 observed resting on the leaves of an ornamental spruce, the Colorado spruce (Picea 



fulgens), on the College 



grounds. These saw-flies had 

 a wing expanse of one inch 

 and a quarter, while the body 

 was nearly three-quarters of 

 an inch in length. On several 

 of the branches were large 

 masses of castings which were 

 over two inches in diameter. 

 These masses of castings were 

 never situated at the ends of 

 the branches, but about mid- 

 way on the branches. The 

 leaves in the neighborhood of 

 the castings had been eaten 

 by the large graenish-black 

 larvse which occupied silk- 

 lined tunnels within the 

 mass. (Fig. 10.) 



No eggs could be foand at the time the adults were seen. A good spraying of 

 Paris Green was given, since which operation no larvse have been found. It is evident 

 that the Lyda saw fly is a very destructive insect to this spruce, and should conditions 

 ever arise when the larvae were numerous, the damage would be very considerable 



Fig. 11. 



The "adults are larger than the adults of the larch saw-fly. Their abdomen is 

 depressed and flattened. Their front wings are about as long as the thorax and abdomen 



