Plantings of Ceanothus griseus L. (also Ceanothus thyrsiflorus var. griseus L.) were invaded by a rare leaf miner, Tischeria immaculata (Braun). Adults appeared at the beginning of May and most flew between 1750 and 2400 h. Mating and egg laying started immediately and females laid an average of 35 eggs (range: 15–48). Eggs measured 0.12 mm by 0.08 mm, were translucent, and hatched to minute larvae which did not feed until 24 h after hatch. Larvae reared at different temperatures and moisture regimes performed best at 21 °C and 70% relative humidity. Frass was ejected through the oval trap door constructed at the initiation of the larval mine. Pupation took place anywhere within the mine but the adult emerged through a crescentic exit hole at the end of the mine.The principal enemy was a eulophid, Pnigalio flavipes Ashmead. Various species of spiders and a bird, Junco hyemalis L., preyed on adults. Emerging adults were also trapped and killed in spittle-bug froth.

Species of Ceratozetes Berlese (Ceratozetidae) of Canada and Alaska are revised. Four new species, Ceratozetes watertonensis, C. borealis, C. oresbios and C. pacificus are proposed, C. gracilis cuspidatus Jacot is elevated to specific status and redescribed, and C. gracilis (Michael), C. peritus Grandjean, C. kananaskis Mitchell, C. virginicus (Banks), C. mediocris Berlese, and C. thienemanni Willmann are redescribed. Immatures of C. borealis and C. pacificus are described and those of C. peritus, C. kananaskis, C. mediocris, C. gracilis, C. virginicus and C. thienemanni are redescribed. Ceratozetes jeweli Rockett and Woodring is synonymized with C. virginicus. A key to species from Canada and Alaska is given.

A new subspecies of Ornithoptera croesus Wallace, O. c. toeantei, is described from Morotai Island, Indonesia; an annotated illustration of a gynandromorph of O. croesus lydius Felder from Halmaheira Island is presented.

Investigation of the European pine shoot moth pheromone has revealed three components in addition to the previously identified E-9-dodecenyl acetate (E9-12:Ac): E-9-dodecenol, dodecyl acetate, and dodecanol. Inclusion of E-9-dodecenol makes lures more attractive to the moth than unmated females or E9-12:Ac alone. Dodecyl acetate had no apparent effect when added to this more attractive mixture whereas dodecanol had an inhibitory effect. Dodecyl acetate appeared to mask the inhibitory effect of dodecanol when 0.3% or more of the former component is present in the lure. Relative proportions of components are critical in comparative testing or monitoring populations of the moth.

Two different application methods were tested using a nuclear polyhedrosis virus as a control agent at an early stage in the outbreak cycle of Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), in south central British Columbia in 1981. The virus, which often leads to the development of an epizootic late in the outbreak cycle, was propagated in whitemarked tussock moth, Orgyia leucostigma (J. E. Smith). A helicopter fitted with a boom and nozzle was used for treating four plots (total area 19.8 ha) at a dosage of 2.2 × 1011 polyhedral inclusion bodies (PIB) in an emitted volume of 11.3 L ha−1. Five to eight weeks after spraying, microscopic examination of live larvae showed that 77 to 100% were infected. In ground-spray applications of two other plots, a modified orchard-type sprayer was used to apply 2.4 × 1010 PIB in a volume of 4.5 L per tree. Microscopic diagnosis of live larvae at 8 weeks post-spray revealed 83 and 85% infection.In autumn 1981, no egg masses could be found in the plots treated earlier that year and no larvae were found on the sample trees in 1982 or 1983. The treatment was effective over a range of initial mean larval densities of 41 to 206 m−2 of foliage. At the same time, populations in nearby untreated areas increased in 1982. Little foliage protection was obtained the year of application due to the lengthy virus incubation period, but the trees recovered quickly when populations disappeared due to the virus epizootic.

Potato leafhopper, Empoasca fabae (Harris), early-instar nymphs (1–2 instar), late-instar nymphs (3–5 instar), adult males and adult females were caged at various densities on seedling alfalfa cv. Vernal and allowed to feed for 6 days. Feeding by adult females, late-instar nymphs, and adult males retarded plant height, leaf number, and dry weight, about 20 to 50% more than did the early-instar nymphs at most of the leafhopper densities tested, over 6 days. Protein content was affected differently from the other plant parameters; it was reduced most by adult males. This was apparently due to premature death of the plants caused by late-instar nymphs and adult females. The percentage reduction for each of the plant parameters was highly correlated with leafhopper density and was nonlinear, except with the early-instar nymphs. Alfalfa plants exposed to two or four late-instar nymphs or two adult females, significantly increased in height and leaf number during a 7-day recovery period. Plants exposed to four adult females did not recover.

The two known species in the genus Dodia Dyar are reviewed, and one new species, Dodia kononenkoi, is described from Magadanskaya Oblast, USSR, and Yukon Territory, Canada. The generic name Hyalocoa Hampson is synonymized with Dodia and two new combinations are proposed. Dodia kozhantshikovi (Sheljuzhko) and D. atra (Bang-Haas) are synonymized with D. albertae Dyar. Descriptions and range maps are included, and adults and genitalia of the three species are illustrated.

A revised generic description of the three larval instars of Omophron is presented. Hypothetical apotypic character states of the genus are: bidentate retinaculum; lacinia subequal in length to galea and apically subspatulate; ligula as long as labial palp; pore LAa located on ligula and seta LA6 on basal third of ligula; setae TI2* and TI7* of middle and hind tibiae located basally; setae UN1 and UN2 flat and about 1.5 times the length of claws; presence of serially paired gland-like structures on abdominal pleura I–VII; hypopleurites not apparent in first instar; apex of urogomphi extended as a small hyaline appendix in first instar; setae PY1, PY2, and PY6 on the pygidium absent. Most of these character states are autapotypic, and no synapotypies were found to indicate a sister group to Omophron.

Connatichela artemisiae, a new genus and species of leptopiine weevil endemic to the Yukon Territory, Canada, is described and illustrated. The genus is placed in the group of leptopiine genera characterized by the absence of metepisternal suture, lack of scales on antennal funiculus, and presence of broad scales on antennal scape. Connatichela members are readily distinguished from related leptopiine genera by the presence of connate tarsal claws and the structure of male and female genitalia. Phylogenetic and zoogeographic relationships of the genus are unresolved at present. Adult specimens were found in association with plants of a small species of Artemisia.

Fossil material of mid-Wisconsin age assignable to C. artemisiae from the Yukon Territory, extreme western Northwest Territories, and Alaska suggests a slightly more widespread Pleistocene distribution, with recent restriction to the Yukon Territory. This restriction may have resulted from a decrease, during the post Wisconsin, in availability of dry steppe-tundra habitats throughout most of Beringia.

The spotted tentiform leafminer, Phyllonorycter blancardella (Fabr.), is an important pest of apple in Michigan (Dutcher and Howitt 1978), New York (Weires et al. 1980), and Ontario (Pree et al. 1980). In Ontario, the leafminer has three generations per year (Johnson et al. 1976) and overwinters as a diapausing pupa in the leaf litter (Johnson et al. 1976; Trimble 1983a). The spring activity period usually begins during late April or early May (Trimble 1983b) and the two summer activity periods usually begin during mid-June and mid-August (Johnson et al. 1976; Trimble, unpublished).