THE CANADIAN ENTOMOLOGIST. 41 



result in the destruction of the whole crop, in places where the 

 infestation is as severe as in the Truro district. Furthermore, it 

 would have little permanent effect where the pest is so numerous 

 on neighbouring wild plants. As for destroying the wild plants 

 that harbour the insects, these are much too numerous to commend 

 the method to the practical farmer. 



References. 



The following are the most important references to the work 

 of this insect: — 



Bethune, C. J. S. Depressaria Ontariella, n. sp. (N. sp. = hera- 

 cliana DeG.) Can. Ent., Vol. II, No. 1, Aug. 1869. 



Cook, A. J. Rep. of Zoologist, 3rd Ann. Rep. Mich. Agri. Exp. Sta. 

 1890; 112-115, 4 figs. 



Cook, A. J. Two Insect Pests New to Michigan. 19th Ann. Rep. 

 Seer. St. Board Agri. Mich, for 1880; 275-278. 



Riley, C. V. The Parsnip Webworm. Insect Life, Vol. I ; 94-98. 



Riley, C. V. The Parsnip Webworm. Orange Judd Farmer, ^17, 

 Nov. 1888; 319. 



Southwich, E. B. The Parsnip Webworm. Insect Life, Vol. V' 

 Aug. 1892; 106-108. 



Harrison, J. W. H. An Unusual Parsnip Pest. Entomologist, 46 

 (1913), No. 597; 58-59. 



Explanation of Plate II. 



1. Eggs in place on sheath (insert, single egg greatly enlarged). 



2. Larva, lateral aspect; stem cut longitudinally showing larva 



spinning cocoon. 



4. Pupae, ventral and dorsal aspect. 



5. Stem cut longitudinally, showing cocoon and pupae in situ. 



6. Adult moth. 



7. Flower head webbed up by larvae. 



8. Holes made by larvae in stem of Cow Parsnip. 



