The relationship of pheromone trap catch to emergence and oviposition of the codling moth was defined for the two-generation climate of Michigan. Catch anticipated emergence and oviposition during spring flight when the trap displayed greatest efficiency, but lagged behind emergence and closely followed oviposition during the second generation. Trapping efficiency declined towards the end of the first generation and was generally lower during summer flight. Factors which possibly relate to this efficiency loss are discussed. First catch and the catch peaks in both generations were evaluated as reference points for the prediction of phenological events (particularly egg hatch) in both generations Of four forecasting methods, degree day and developmental unit summations, starting from first catch, for the preoviposition and incubation period were most reliable in predicting the beginning of spring brood egg hatch.

Periphyllus pusillus n. sp. from Acer villosum Wall., Serratocallis takahashii n. gen., n. sp. from Quercus sp., and Myzocallis (Hoplocallis) microsetosus n. sp. from Quercus incana Roxb., collected in the Western Himalayas, are described. The taxonomic position of the aphids is discussed.

Several populations of the bagworm, Thyridopteryx ephemeraeformis (Haworth), were studied to determine the factors affecting survival of the larvae and pupae. Infestations were on Juniperus virginiana (juniper) and Thuja occidentalis (arborvitae). A normal complement of parasites, hyperparasites, and scavengers was recovered with four new records. The ichneumonid Itoplectis conquisitor (Say) accounted for most of the parasitism (75.9%). Females of this species were more often found in female hosts and males in male hosts. Although predation or larvae vacating bags were not directly observed, empty bags were found in each larval population beginning in mid-July and early August. The proportion of empty bags increased sharply from less than 10% to about 50% during a 3-week period but remained at this level for the rest of the season, suggesting that the bags were emptied during the first 3 weeks they were observed.

A new genus and species, Playaspalangia rothi, is described from Sonora, Mexico, in the intertidal zone of algae-covered rocks.

Three western species of tussock moths of the genus Orgyia are all susceptible to infection by the same two nuclear polyhedrosis viruses. An eastern species of Orgyia is also affected by these viruses. In the Western States, the natural occurrence of the two viruses appears to be limited to definite geographic areas. Infectivity of the viruses for hosts outside the genus Orgyia is not known. One report of such cross-infectivity could not be substantiated. Bodies which appear to be composed of viral materials but which are not normal virus particles are sometimes found occluded in polyhedra.

Hemlock sawfly infestations occur most commonly in the warm southern half of southeast Alaska. Biotic factors that limit sawfly populations are a fungus, Entomophthora sphaerosperma, which kills disproportionately large numbers of female larvae; food quality as affected by host site and defoliation; and three ichneumonid parasitoid species, Delomerista japonica diprionis, Oresbius tsugae tsugae, and Itoplectis quadricingulatus, which attack prepupal larvae in cocoons. E. sphaerosperma was the most effective natural control in recent years, especially during wetter than normal summers. Parasites which attack after the fungus has decimated larval populations were most abundant during two dry summers. Parasitization and sawfly emergence were directly related, and both were highly inversely correlated with percentage fungus killed sawflies. Sawflies reared on lightly defoliated trees produced significantly more eggs than those reared on heavily defoliated trees, and fecundity was directly related to cumulative heat units during the summer. Between 1952 and 1974, most negative sawfly population trends south of Frederick Sound occurred when two wet summers occurred consecutively. Apparent widespread collapse of sawfly populations in 1974 was associated with low temperatures in 1973 which delayed sawfly development and reduced opportunities for successful oviposition.

This Index endeavors to continue part of Patch's (1938) impressive work, “Food Plant Catalogue of the Aphids of the World,” which attempted to include all host records up to the end of 1935. Although Higuchi and Miyazaki (1969) have produced a tentative host catalogue for Aphidoidea in Japan and Sharma (1969, 1971, 1972), Smith (1972), and Szelegiewicz (1969) have produced more recent bibliographies, Patch's host catalogue has not been updated on a world-wide basis. This is an attempt to fill this need as regards original host records of species of aphids described during 1935 to 1969. The index has been arranged alphabetically by genus and species of host, or under the colloquial name for the host where this was the only information given in the description of the species. Fossils, and species where the host was not given, have been listed under Fossils and Unknown respectively.

A sequential decision plan, based on the Poisson distribution and providing for two infestation classes, was drawn up as an aid to management of the alfalfa weevil, Hypera postica (Gyll.), on first-growth alfalfa in Ontario. It is based on counts of the oviposition punctures in three-stem bouquets of alfalfa, and, in economic situations, will provide the grower with sufficient lead time to consider alternative action strategies. An appraisal of the plan under field conditions showed that it rated the infestation status of the weevil correctly in 56 of 60 cases. Sampling time averaged 35 man-min.

Dorcatomophaga (Nearctomophaga) jonesi n. subgen., n. sp. is described. Subgeneric characters are compared between the Nearctic and Palearctic forms. Representatives of the genus have not previously been recorded from North America.