During the last seven years, larvae representing more than a dozen species of the genus Eupithecia have been received by the Forest Insect Survey of Canada. With the hope that some of these larvae may be recognized more readily, two species are described herewith; additional notes are given on three species already described, and a key for the separation of mature larvae of these five species is presented at the end of this article.

The preceding instalment under this title was published in 1945 (Can. Ent., 77: 140-144). At this time I am including the description of five species of the genus Tipula from Washington, Oregon and California, collected by Messrs. T. H. G. Aitken, Mont A. Cazier, J. A. Macnab and A. L. Melander, to whom I am greatly indebted for the privilege of studying very extensive series of Tipulidae sent by them. Except where indicated to the contrary, the types of the novelties are preserved in my collection.

A number of species have been described as new from the West since the publication of Mason's revision of the genus Amphorophora (Proc. U. S. Nat. Mus. 67: 1-92, 1925). To make clear the characters and relationships of some of these aphid species, and particularly those which infest berry crops, the present key has been prepared.

In the past, fumigation at temperatures much below 60°F. has not been widely advocated to control insect pests in unheated structures. The objections to such a practice have been based on a number of considerations which will be discussed later. The possibility of estending the schedule of treatments to lower temperatures is obviously of great importance in Canada, where the mean monthly temperatures in most parts of the country lie below 60°F. for 8 or 9 months of the year and where there are three or four months when the range is between 40° and 60°F.

The spiny caterpillars of this butterfly are known as defoliators of snowbrush, Ceanothus spp.; Essig says that during severe outbreaks they feed on other shrubs and on fruit trees and alfalfa. The following records of flights are of particular interest in that no reports of damage by the caterpillars were received during the season of 1945.

During the summers of 1941 and 1942, with the help of students, I collected in the vicinity of Duluth, Minnesota, some individuals of a species of ant recently described by Dr. M. R. Smith (1939), from Quebec, Canada. The original account of Harpagoxenus canadensis was based on the queen caste, an intermediate ergatoid female type, and a simple ergatoid female type, representing 12 specimens in all.

During 1944 one of the worst and most widespread grasshopper outbreaks in the history of British Columbia was in progress. From the Bulkley and Nechako Valleys south through the cattle ranges of the Chilcotin, and over the whole of the southern interior and the Kootenays, grasshoppers were present in outbreak numbers. In some areas they had been more numerous in 1943 and were on the decline, while in other sections they were still on the increase, but everywhere they were present in damaging numbers.

The preceding part under this title was published in 1946 (Can. Ent., 77: 186-191). I am here discussing a number of species from the western United States, chiefly from Oregon and California, where they were collected by my friends, Messrs. T. H. G. Aitken, Mont A. Cazier, Kenneth M. Fender and Lawrence W. Saylor, to whom I am greatly indebted for the privilege of retaining the types in my collection. A few additional species were taken by myself in Arizona and Wyoming.

This list of types of genera and subgenera has been complied to aid workers in the family Pipunculidae. Recently several new genera have been erected in this family and some confusion as to genotypes has arisen.

Over a century ago in his memoir on Gorytes, Lepeletier proposed Lestiphorus for the reception of Rossi's distinctive European species Crabro bicinctus. However, very few subsequent authors have recognized it as a discrete generic entity. It has generally been regarded as merely a species group or occasionally treated as a subgenus of Gorytes or some related genus. But Lestiphorus, although small, is indubitably entitled to full generic rank.

Recent tests of the effects of a 5 per cent DDT dust on various household insects in the basement of a cafeteria near Eastview, Ontario, resulted in a high mortality among several species of Coleoptera occurring there.

The species of Coleoptera listed below have been collected since the publication of a previous list (1944, Canad. Ent., 76:163) of Essex County material.

Mr. W. J. Brown, Division of Entomology, Ottawa, has once more obliged by identifying most of the specimens. Identification of the Oberea and Tetraopes species was made by Mr. W. S. Fisher of the United States Department of Agriculture, Washington, B. C.