The types of the species of North American Scolytidae (Coleoptera) described by J. M. Swaine are catalogued. Holotypes of 62 species are listed and 48 lectotypes are selected. All types, with a few noted exceptions, are in the Canadian National Collection, Ottawa.

Lectotypes are designated for Cryphalus amabilis Chamberlin and C. grandis Chamberlin. The lectotypes are in the Canadian National Collection, Ottawa.

The sawfly Diprion hercyniae (Htg.) prefers the old to the new growth of its preferred food plant, Picea glauca (Moench) Voss. The similarity between the responses by the sawfly and those by one of its parasites, the tachinid Drino bohemica Mesn., and the significance of this similarity are discussed.

In New Brunswick, Tremex columba (Linnaeus) has a minimum life cycle of 2 years. Adults oviposit most commonly in weakened or injured beech trees (Fagus grandifolia Ehrhart) from about 15 August to 15 October and lay two to five eggs in each oviposition hole. The blackish eggs either hatch in 2–4 weeks or hatch the next May or early June. The larvae tunnel in wood infected with the fungus Daedalea unicolor Buller ex Fries. This fungus is closely associated with each stage of female development. Eggs laid in the absence of the fungus hatch but the larvae do not develop beyond the first instar. T. columba passes the second winter in the larval stage and the adults begin to emerge in August. During each year of observation, males began emerging before females. The emerging females often lay eggs in the galleries and the progenies are male. Three species of Megarhyssa are the chief parasites of T. columba larvae in New Brunswick.

Ovex, tetradifon, and chlorbenside which are largely innocuous, and parathion which is more harmful, to beneficial insects and predaceous mites, have been used in apple orchards in Nova Scotia to control outbreaks of phytophagous mites. Dicofol is used at present but it is toxic to predaceous mites. Animert V-101 is effective against Panonychus ulmi (Koch) but is ineffective on most beneficial species. Dicofol and Animert V-101 initially reduced a high population of P. ulmi but were equally ineffective on predaceous insects. The latter chemical was innocuous to Typhlodromus pyri Scheuten and Vasates schlechtendali (Nal.) but gave partial control of P. ulmi. A similar high population of P. ulmi was reduced to a low level on a comparative untreated plot where a high number of predators was present. This reduction was evident 1 month later than on the treated plots. The overwintering numbers of P. ulmi in 1966 were below a commercially tolerable level on the three plots.

The garden symphylan (Scutigerella immaculata Newport) population of a field of table beets, Beta vulgaris L., in northwestern Oregon, was studied. The number of symphylans from the samples ranged from 110 to 1131 per cubic foot with an average of 557. Several laboratory tests were conducted to study garden symphylan population increases in soil types treated differently. It was found that garden symphylans reproduce well in soil types such as Felida, Salkum, and Melbourne. Manure added to these soils increases their porosity, probably supplies additional foodstuff, and consequently provides the best rearing medium.

The three boreal species of the winter stonefly genus Allocapnia, minima (Newport), pygmaea (Burmeister), and illinoensis Frison are subboreal species whose ranges include a band across eastern Canada from the western end of Lake Superior to the east coast; minima occurs also in Newfoundland. An analysis of variation in pygmaea and illinoensis suggests that during the Wisconsin glacial maximum these two species occurred south of the ice in the Cumberland Plateau region in east-central United States, and that they dispersed first northward through the Appalachians, then east and west into their present range. Geoclimatic evidence suggests that minima did not persist in Newfoundland during the glacial maximum. Its ecological similarity to pygmaea suggests that minima also persisted in the Cumberland Plateau area and dispersed in the same fashion as the other two species.

Drifting of honey-bees in a bee flight and rearing room quickly results in imbalances in hive populations. Orientation cues (coloured walls, coloured boards over the hive entrances, symbols on the walls, and objects located in the room) do not reduce drifting. Hive position in the room affects the direction of drifting, with one colony gathering-in a high proportion of the drifting bees.

An examination of North American and Siberian adults of Holarctias indicates that H. sentinaria (Geyer) occurs only in the Nearctic. It differs from the Siberian species, H. rufinaria (Staudinger), in colour pattern of the wings and in the shape of the cornutus of the male genitalia. Specimens named H. magnetaria (Guenée) in North American collections should be re-examined and most, if not all, placed in the genus Scopula Schrank.

The nominal genera Mimocomma Warren, Polychorista Warren, and Parudea Swinhoe are synonymized with Thliptoceras, and Prophantis Warren is removed from synonymy. Twenty previously described nominal species are referred to Thliptoceras; of these, 12 are recognized as valid. The following nominal species are referred to Thliptoceras for the first time: Circobotys marginalis Hampson, from Crocidophora; Mimocomma fulvimargo Warren, from Crocidophora; Salbia althealis Walker, with its three synonyms, Botys cydipeialis Walker, Botys tisiasalis Walker, and Phycidicera manicalis Snellen, all from Deba; Botys gladialis Leech, from Crocidophora; Crocidophora rufitinctalis Hampson; Ebulea decoloralis Warren, from Loxostege; Pyrausta torridalis Hampson; Phlyctaenodes decoloralis sinensis Caradja, from Loxostege; Parudea fimbriata Swinhoe; Crocidophora artatalis Caradja; Botys fuscocilialis Snellen, from Pyrausta. Lectotypes are designated for: Hapalia cascalis Swinhoe; Thliptoceras variabile [-is] Swinhoe; Thliptoceras epicrocale [-is] Swinhoe; Circobotys marginalis Hampson; Botys gladialis Leech; Ebulea decoloralis Warren; and Crocidophora artatalis Caradja. Thliptoceras rufitinctale (Hampson) is sunk as a junior synonym of T. gladiale (Leech) and T. torridale (Hampson) as a junior synonym of T. decolorale (Warren). T. sinense (Caradja) is considered a distinct species and not a subspecies of T. decolorale (Warren). T. buettikeri is described as a new species from Thailand.

The apple mealybug, Phenacoccus aceris Sig., has been a pest of apple trees periodicallv since an outbreak was reported by Gilliatt in 1935. The writer investigated mortality in its population during the summer of 1966 in connection with the current sporadic outbreak in the Annapolis Valley. Decline of outbreaks was attributed bv Marshall and Pickett (1944) to attacks by the parasite Allotropa utilis (Mues.) (Hymenoptera: Platygasteridae), and the abundance of this parasite in the current upsurge in mealybugs suggests it is an important factor. Mr. K. H. Sanford (personal communication) estimated approximately 58% of the mealybugs in the winter of 1965–1966 and about 80% in the winter of 1966–1967 were parasitized by this species.

The water mite Albia caerulea Marshall, 1927, is reported from Lake Opinicon, Leeds Co., Ont. Descriptions and figures of larvae and of nymphs reared from them are presented. The occurrence of this mite on caddisflies (Leptocerus americanus (Banks), Trianodes sp., and Leptocella sp.) is recorded.

Several species of Epuraea have been reared from fungi causing diseases of pine and oak over much of northern United States and Canada. Epuraea obliquus Hatch and E. boreades new species are described and figured. Three other species, E. avara (Rand.), E. corticina Er., and E. terminalis Mann., were reared from oak wilt fungus mats.

In two well-kept but nonsprayed orchards, the European red mite, Panonychus ulmi (Koch), was more numerous and caused more leaf damage to Delicious than to Spartan or McIntosh apple trees. The predacious phytoseiid mites, Metaseiulus occidentalis (Nesbitt) and Neoseiulus caudiglans (Schuster), were more numerous on both Spartan and McIntosh than on Delicious. The differences in the external structure of the leaves may be the reason for the greater abundance of phytoseiids on Spartan and McIntosh.

Female Nasonia vitripennis (Walk.) discover large housefly (Musca domestica L.) puparia more easily than small ones, and select for drilling a larger percentage of the large ones that they discover. If exposed only to small hosts instead of large ones, the parasites attack more of them in a given time, laying fewer eggs on each. This probably results because changes in parasitized hosts, leading to rejection by the females, occur sooner in small than in large fly pupae. Survival of immature N. vitripennis and of another pteromalid, Muscidifurax raptor G. & S., is greater on large hosts than on small ones. Sex ratio of both parasite species is unaffected by host size.

Six carbamates, Niagara 10242, Niagara 10586, Niagara 10559, carbaryl, Baygon, and Bayer 44646, had negative temperature coefficients of toxicity to second instar nymphs of the migratory grasshopper, Melanoplus sanguinipes (Fab.). The intensity of the negative temperature effect was inversely related to the basic toxicity of each compound. Piperonyl butoxide synergized all six compounds, but the amount of synergism was not related to basic toxicity. The results suggested that several carbamate detoxication mechanisms of varying importance for different carbamates occur in grasshoppers. Whereas all of these mechanisms appeared to be equally affected by post-treatment temperature, they were not all equally inhibited by piperonyl butoxide.

Behavior patterns associated with egg-laying are proposed as a potentially valuable source of taxonomic characters for blister beetles that excavate oviposition chambers in the soil. Methods of digging the burrows and covering the eggs are complex and stereotyped and often differ considerably from one species to another. Relationships among species of Lytta, Linsleya, and Epicauta suggested by their nesting behavior are compared with those indicated by other characteristics.

Aulacorthum dorsatum new species is described from British Columbia. Its only known host plant is salal, Gaultheria shallon Pursh.

Two strains of the pupal ectoparasite Nasonia vitripennis (Walk.) originally derived from a single laboratory strain exhibited differences in the proportion of adjacent hosts attacked by the parasite following 65 weeks (approximately 32 generations) in experimental parasite–host systems. Strain I parasitized a greater number of adjacent hosts (19.9%) than strain II in the first generation after removal from the multi-cell system. The difference between the two strains and the laboratory strain decreased from the first to the fourth generation indicating a reversion toward a behavior pattern more akin to that of the laboratory strain.

Pineus floccus Patch is an occasional pest of ornamental spruces in eastern North America which produces unsightly galls at branch extremities. Damage to the specific alternate host, eastern white pine (Pinus strobus L.), may result in lateral shoot injury similar to that reported for P. pinifoliae (Fitch) by DeBoo, Dimond, and Lowe (1964). However, outbreaks of P. floccus are uncommon, with populations regulated at low levels throughout most of its distribution.