PROCEEDINGS, 1917. 53 



The Male Moth has a wing expansion of 23 mm. -30mm. General colo*, silver 

 gray to brownish gray. A distinct white spot occurs on the front edge of the fore wing 

 near the tip, often joined by a smaller black spot. A row of small blac'< spots occur on 

 the outer margin. In most specimens the fore wings appear to be crossed by light and 

 dark wavy lines. The hind wings are almost unicolorous, often bearing irregularly plac- 

 ed small black spots. Antennae 4 mm.-6mm. in length. The male moths are not strong 

 flyers but are often carried long distances by light winds; they are readily attracted by 

 the presence of the females. 



The Female Moth. Though wing-pads are present in the pupa, no vestige re- 

 mains in the adult stage, with the exception of one female seen with rudimentary 

 wing-pads out of many thousands observed during the past season. Length 7.5 mm.- 

 10 mm.; width 2.2 mm. -3.0 mm. at widest part. Antennae thread li'^e, 4 mm.-5mm. 

 long. Thorax and abdomen fused together. Color uniform ash grey above, somewhat 

 paler beneath. 



FOOD PLANTS. 



This insect is a very general feeder and will consume the foliage of any deciduous 

 tree. During the past season at Kentville, N. S., in addition to the orchards, large areas 

 of oak (Quercus alba) were completely defoliated; when food became scarce on the 

 larger trees they attacked different plants of the families Rosaceae and Gramineae. 

 Elm, beech, maple and hawthorn were also severely attacked. 



NATURE OF INJURY. 



The injury caused by the Fall Canker Worm is almost solely the defoliation of or- 

 chard and shade trees, the young larvae causing a burnt-over appearance to the trees 

 and the older ones stripping the trees completely. The larvae will sometimes feed in the 

 apple blossoms, when very young. 



NATURAL ENEMIES. 



A larval parasite (Suplectrus sp.) was reared during this experiment, also some egg 

 parasites which unfortunatly have not been determined at the time of writing. 



ACKNOWLEDGEMENTS. 



The writer is indebted to Prof. W. H. Brittain for assistance and advice in con- 

 nection with this investigation, also to Mr. L. G. Saunders for valuable laboratory 

 assistance. 



