Cazier (1953, pp. 1-13) listed six species of Acoma having three-segmented antennal clubs. Though some of these species are easily distinguished, Cazier noted that others vary considerably. Since Cazier's revision, additional material has become available that makes further consideration of this group of Acoma worthwhile. In this paper, a key to the species having a three-segmented antennal club is given, the six known species are redescribed, and nine new species are described.

Zetterstedt (1838-1855) described 11 species of Lonchaeidae from the Palaearctic region: Lonchaea albitarsis, L. crassinervis, L. deutschi, L. flavidipennis, L. hirticeps, L. hyalipennis, Earomyia lonchaeoides, L. metallica, L. pallipennis, L. palposa, and L. parvula. He erected the genus Earomyia for lonchaeoides when he described that species but assigned all of the other species he dealt with to the genus Lonchaea Fall.

During the summer of 1957, collections of insects from burrows of the woodchuck, Marmota monax, were made hv the senior author in the vicinity of London, Ontario. The collector obtained the insects by reaching into a burrow for a distance of about one yard and scraping out by hand the loose soil at the bottom of the burrow from the outer one yard of the length of the burrow. The accumulation of soil and debris thus obtained was combed over and insects were removed from it. By this method insects were collected from thirty burrows, and these were sorted according to order and family and sent to taxonomic specialists for identification.

In the laboratory it was observed that the plant bug Liocoris borealis Kelton occasionally attacked its predator, an assassin bug, Sinea diadema (F.) (Reduviidae), when the nymphs of S. diadema were immobilized during moulting. During an experiment seven out of 35 predators were killed by their intended prey. It is probable, how-ever, that others were also killed, for only seven reached the adult stage.

One of the objectives in the study of tick paralysis at Kamloops was to discover a species of laboratory animal that is consistently susceptible to this disease. Such an animal was needed to explore inconsistencies probably caused by differences in tick virulence or host susceptibility. Observations on infestations of adults of Dermacentor andersoni in tick paralysis areas in British Columbia, and experiments with similar ticks on large and small wild and domestic animals, have revealed the following.

Hylobius warreni Wood is a recently described weevil that was originally confused with Hypomolyx piceus (DeGeer, 1957). The larvae attack the inner bark and cambium of the root system of jack pine, Pinus bankisiana Lamb., and other conifers (Warren, 1956). The life history of this insect is being studied to determine biological differences between it and a closely related species, Hylobius pinicola (Couper). This information is also essential in order to continue detailed studies on the effect of site and other factors on the abundance of H. warreni (Warren, 1956a). The first requirement for fulfilling these objectives is the development of a satisfactory rearing technique.

The following is a description of a new species of predacious mite of the subfamily Phytoseiinae. It is found in orchards in Nova Scotia on the bark of apple trees, but in no instance has it been taken from the foliage. This species is similar in structure to Typhlodromus tiliae Oudmus. (Nesbitt, 1951), but its habits differ. In this paper the differences between T. tiliae and the species herein described are noted and details of a laboratory study of the life-histories and food habits of these species are given.

The cabbage maggot, Hylemya brassicae (Bouché), is one of the main factors limiting the production of high-quality rutabagas, Brassica napobrassica Mill., in the irrigated districts of southern Alberta. This crop is damaged late in its growing season; there is little damage to cruciferous crops in early spring except that occasionally early-transplanted cauliflowers are killed. This suggested the possibility of some change in the cropping practice if the flight and oviposition periods, recorded herein, were accurately known.

There have been several speculations as to the origin and significance of the pupa. One that has had considerable vogue is based on the interpretation, by Lubbock (1883), Berlese (1913) and others, of the larva as a free-living embryo prematurely hatched before it has attained the form characteristic of the adult. A nymph, according to this theory, has completed its embryonic development in the egg where it passed through stages corresponding to those of the larva and attained the form of the adult before hatching. This concept assumes, therefore, that the pupal stage is the equivalent of all of the nymphal instars compressed into a single instar. There are many objections to this theory of which the following may be given. Development from the larva to the adult is not continuous. There is evidence that larval and adult structures are determined independently in the embryo, and the development of the one and the suppression of the other are controlled by the endocrine system. Furthermore, changes in hormone balance which take place in the last nymphal instar of the Exopterygota result in the development of the adult, while similar changes in the last larval instar of the Endopterygota bring about the development of the pupa. For this and other reasons the pupa must be regarded as an adult instar and not as a larval or nymphal instar.

Normally the sugar-beet root aphid, Pemphigus betae Doane, lives and feeds on sugar-beet roots below ground during the summer and fall. However, in many beet fields between Lethbridge and Monarch, Alberta, in September, 1956, a large number of these aphids were found on the soil surface and on the crowns and leaves of the plants. Many of the aphids had crawled up the plants and, even after death, remained clinging to the leaves (Fig. 1). This clinging reaction seemed similar to that of grasshoppers infected with Entomophthora grylli Fresen. Mr. R. B. Baird, Entomology Laboratory, Canada Department of Agriculture, Belleville, Ontario, identified the organism causing the disease destroying these aphids as Entomophthora aphidis Hoffm. This is the first record of this disease killing subterranean aphids in Canada. The only other reports of E. aphidis on root aphids are those of Maxson (1916) in Colorado and Charles (1941) in California. In Canada, it has been previously reported as a factor in control of the pea aphid, Acyrthosiphon pisum (Harr.), in the Annapolis Valley, Nova Scotia (MacLeod, 1953).