THE CANADIAN ENTOMOLOGIST 267 



6436 Semioscopsis packardella Clem. 



6438 " aurorella Dyar. 



6439 " megamicrella Dyar, 



6440 " inornata Wlsm. 

 6443 Ethmia fiiscipedella Wlsm. 



Elachistidae. 

 Mompha claudiella Kearf. 



Tineidae. 



7024 Tineola hisselliella Hum. Probably. 

 7026 Monopis hiflavimaculella Clem. 

 7030 " monachella Hbn. 



Hepialidae. 



7150 Sthenopis argenteomaculatus Harr. Probably. 



7151 " quadrigiittatus Grt. Probably. A study of our 

 Manitoban forms of Sthenopis is desirable. 



ECOLOGICAL NOTES ON THE SPRING CANKER WORM 

 (PALEACRITA VERNATA, PECK). 



BY B. P. YOUNG, CORNELL UNIVERSITY, ITHACA, N.Y. 



During the past few years the elm trees of Lawrence, like those, 

 of many other Kansas municipalities have suffered materially 

 from infestations by the spring canker worm, Paleacrita vernata, 

 Peck. In fact, the large increase in numbers of this insect during 

 the spring of 1916 seemed to foretell the impending danger of a 

 worse devastation the next season and brought about a co-operative 

 move on the part of the citizens to control the pest. Early in 

 February, 1917, the city commissioners banded all elm trees, and 

 other trees adjacent, as well as poles, with tar paper and tangle- 

 foot, both in yards and on terraces in front. The cost of this work, 

 combined with that of keeping the tanglefoot sticky during the 

 season of emergence, was charged to the various taxpayers con- 

 cerned. 



Realizing the advantages of such conditions for an ecological 

 study of the pest, the writer, while associated with the Depart- 

 ment of Entomology of the University of Kansas, chose a district 

 in which the trees had been completely defoliated the previous 

 year and carried on the experiment outlined below. 



August. 1918 



