1907 ENTOMOLOGICAL SOCIETY. 83 



toba and Saskatchewan. In tlie Ottawa district, both of these caterpillars 

 were decidedly more in evidence than is usual and their work could readily 

 be seen, chiefly on elm and basswood trees. 



Many specimens and reports of injury by these insects have been sent in. 

 The following extracts from some of the letters received at the Division of 

 Entomology, will give an idea of the extent of the infestations. 



The Hickory Halisidota Tussock Moth. 



Weymouth, N.S., August 15. "The caterpillars which I sent you on 

 the 7th inst., and which you identified as those of the Hickory Tussock Moth, 

 are very numerous on alder trees. To-day I noticed several trees which were 

 covered from top to bottom with these caterpillars. I also found them on 

 an apple tree, hundreds on a leaf." M. G. DeWolfe. 



North Range, N.S., August 16. "I send you some caterpillars which 

 are attacking the beech trees here. They move about from one limb ?to 

 another. I am also told that they are on the apple trees near by, as well as 

 on the beeches." F. V. McNeill. 



Smith's Cove, N.S., August 15. "I am sending you some caterpillars. 

 Please tell me what they are as they are eating the trees very badly. They 

 are mostly on hardwood trees, birch and beech, but apple trees are also being 

 injured." • G. W. Potter. 



Bear River, N.S., August 21. "Am sending you a small box containing 

 samples of caterpillars that are numerous in some sections of Digby County. 

 Please tell me what they are and give me a remedy for them." B. C. Clarke. 



The Spotted Halisidota Tussock Moth. 



Lancaster, Ont., August 28. "I found a large number of caterpillars, 

 such as the one I am sending, on apple trees." A. G. McBean. 



Brome Centre, Que., August 31. "I am sending a species of caterpillar 

 which has been very numerous and very destructive here." H. H. Millar. 



Brandon, Man., Sept. 13. "I am sending you some specimens of a cater- 

 pillar which I found quite common in many tree plantations during the past 

 two weeks or more. This caterpillar is found most frequently on the Mani- 

 toba maples. I have also found it on Russian poplars, and some of the bush 

 fruits, such as gooseberries and currants, are infested to quite an extent." 

 I\ W. H. Jacombe, Inspector of Tree Plantations, Dominion Forestry 

 Branch . 



Yellow Grass, Sask., Sept. 13. "The caterpillars which I send have 

 been doing considerable harm by eating the leaves of ash-leaved maples." 

 J. J.Odell. 



Barronsfield, N.S., Sept. 16. "I send a caterpillar which seems very 

 destructive. One Manitoba maple tree noticed particularly was completely 

 covered with them." J. H. Seaman. 



Mount Hebron, N.B. "I enclose a caterpillar which is abundant on 

 apple trees in this vicinity." H. H. Biggar. 



At Rostrevor, on Lake Rosseau, Muskoka, Ont., where I spent the first 

 three weeks in September, the larvae of the Hickory Halisidota were very 

 abundant. In the rich woods of maple, birch, etc., near by, the caterpillars, 

 which were wandering around in search of winter quarters, could be seen at 

 almost every step. The Spotted Halisidota was also present at Rostrevor, 

 but was not nearly so abundant. Such larvse of the latter as were seen were 

 all on alder. 



From the above quotations, it will be seen that the abundance of these 

 insects in 1907 was much commented upon and caused considerable anxiety. 

 Fortunately, however, these caterpillars appear late in the season and, for 



