The cinnabar moth, Tyria jacobaeae L., was established in the Atlantic provinces and British Columbia for the control of tansy ragwort. Establishment was difficult to obtain with imported stock: only two of 14 colonies survived, one on each coast. The rate of survival in these colonies increased with succeeding generations, and with stock from the regional colony eight of nine releases became established in Nova Scotia. Most of the established colonies increased until the ragwort was defoliated.

Parasitism by Aphidius smithi reduced the fecundity and population growth of pea aphid, Acyrthosiphon pisum. Aphids that were parasitized during the first or second instar period died as fourth instars without producing offspring. Parasitized third or fourth instars usually reached maturity and produced a variable number of progeny. Parasitized adult aphids stopped producing nymphs approximately 7 to 8 days following attack by A. smithi. Equations are given for the relationship between the mean total fecundity, the intrinsic rate of increase, and the doubling time of apterous and alate viviparous pea aphid and the aphid age at the beginning of parasitism.

The effects of parasitism by Hyposoter exiguae (Viereck) on certain developmental parameters of Trichoplusia ni (Hübner) were influenced by host age at parasitism.

Head-capsule growth increments for parasitized Trichoplusia ni became smaller with each successive molt during parasitism so that determination of instar on the basis of head-capsule width became impossible.

Parisitized T. ni showed a proportionately smaller gain in weight from time of stinging until parasitoid emergence the older they were when stung (6 times for 3rd instars; 2 times for 4th instars; and no gain for 5th instars). This retardation was evident 24 h after parasitism. Essentially the same results were obtained for dry weight.

Percentage dry weight of parasitized larvae tended to increase over control values until the 5th stadium when controls abruptly increased. Values for parasitized 5ths remained below the controls. Values found on the last days reflected those of the parasitoid which composed most of the mass inside the host cuticle.

Hemolymph specific gravity in controls and parasitized 3rd instars oscillated with a frequency of one stadium in the 3rd, 4th, and early 5th stadia. Specific gravity of controls then rose to a maximum of 1.0501 in the prespinning phase and dropped by the pharate–pupal phase. Values for parasitized larvae in the 5th stadium rose slightly before leveling off, and parasitized 5th instars rose to a maximum on the next-to-last day. Maximum values attained for hosts parasitized as 3rd and 5th instars never reached that for controls on day 11. This may be related to the complete unacceptability or unsuitability of T. ni larvae for parasitism from day 11 on.

Carbon dioxide shows some promise as a fumigant for control of stored product insects and some of its properties and uses have been summarized by Monro (1969). Recently, horticulturists have shown that firmness in apples and cherries is retained longer when they are treated with carbon dioxide before storage (S. W. Porritt, Research Station, Agriculture Canada, Summerland, B.C., pers. comm.). Since the gas has favorable properties for use as a fumigant and leaves no residue in food, we examined its potential for killing pests on harvested apples.

Megapamera n. gen. of the tribe Myodochini, and ashlocki n. sp. from Solomon Islands, and tenua n. sp. from New Guinea are described.

Characters of head profile and abdominal apodemes are used to supplement the variable character of crown shape in determining the nearctic species of Xerophloea. These characters are illustrated for X. peltata (Uhl.), X. minor Laws., X. robusta Laws., X. major Bak., and X. majesta Laws., and a key for species recognition is included. On the basis of these characters, only X. peltata is found in Canada.

The results of surveys of adult and larval mosquitoes in the environs of Chalk River Nuclear Laboratories (CRNL) near Chalk River, Ont., are presented. Twenty-six species were identified, and the succession of major species throughout the summer months has been illustrated. Members of the genus Aedes (A. communis, A. punctor, and A. excrucians) dominated the populations in early and late June. Later, mosquitoes such as Mansonia perturbons and Aedes vexans were the most troublesome.

Five new species of western Rhyacophila, leechi, siskiyou, lurella, arcella, and tehama, are described; siskiyou is remarkably different from other described species. The vedra complex, comprising five species, is discussed with descriptions of two new species.

Soluble extract of Macrosiphum euphorbiae (Thomas) was separated electrophoretically into fast moving and slow moving protein bands These bands were fractionated and studied for their amino acid content. Glycine was the most prominent amino acid in both bands. Aspartic acid, serine, glutamic acid, alanine, and leucine were present in high concentrations in the fast moving protein band. Lysine, alanine, valine, tyrosine, and phenylalanine were present in traces in the slow moving protein band.

Laboratory and field experiments indicate that the female spruce budworm (Choristoneura fumiferana (Clem.)) pupal stadium requires approximately 122C degree-days above a threshold of 7.2 °C (45°F), the male 124. Emergence time on any given day depends on temperature but is independent of photoperiod. Under field conditions male and female budworm mate only once per 24-h period. In the laboratory under continuous illumination females mate repeatedly and males readily mate a second time within a few hours, but the duration of the second copulation is abnormally long. The probability of multiple matings under field conditions is reduced by the restricted period of sexual activity coupled with the duration of copulation and the lower competitiveness of mated insects. Antennae are essential to the male for successful copulation.

Field trials of the synthetic bark-beetle pheromone frontalin demonstrated that lines of single, baited spruce trees, in or near Dendroctonus rufipennis infestations, resulted in concentrated beetle attacks on trees in a strip 2 chains (40 m) wide on either side of the lines of baited trees. Pre-flight insecticide (Lindane) application killed the beetles and prevented tree mortality. Post-attack arboricide (Silvisar) treatment killed most parent beetles and brood under the bark. A predator, Thanasimus undatulus, also was aggregated at frontalin-baited trees. This application of pheromone shows promise of becoming a forest management tool to concentrate beetle attacks in partly infested stands prior to logging.

The seven species of Lonchaeidae described by de Meijere from south-east Asia (all placed by him in the genus Lonchaea) are redescribed, compared with their relatives, and assigned to their proper genera: Lonchaea minuta, L. pugionata, Silba gibbosa, S. lucens, S. obscuripennis, S. setifera (all from Java), and S. cupraria (from Krakatau). Lectotypes are designated for all except cupraria which is known from the holotype only. L. minuta is a prior name for lambiana Bezzi (= longicornis Lamb). S. obscuripennis (= zopherosa McAlpine) is a junior synonym of S. atratula (Walker). Three new species, L. marshalli from Natal, L. hennigi from Formosa, and S. vanemdeni from Malaya, are described. Keys to the world species of the L. impressifrons and of the S. abstata groups of species are provided. The genitalia of 16 species are figured.