The ochrogaster group of the genus Euxoa is defined on the basis of genitalic characters, and a new species closely related to Euxoa ochrogaster (Guenée) is described from the Yukon and western Northwest Territories of Canada.

Udamopyga boniato, new species (Cuba) and U. batemani, new species (Mexico) are described and U. niagarana (Parker) refigured. A revision of Lopes’ (1940) key is presented to include them.

The life history of a tortricid cone moth Choristoneura lambertiana subretiniana Obraztsov in California is described. The larvae feed primarily on staminatc flowers and cones of lodgepole pine although some needle- and tip-mining occurs. The only other recorded host is ponderosa pine.

Eggs are deposited in late July to early August; first-instar larvae migrate from the needles to protected locations on the branches and spin hibernacula. The larvae overwinter predominantly as second-instar larvae in the hibernaculum. They emerge from the hibernacula in April, and mature in four to six weeks. There are six larval instars. The pupal period lasts approximately two weeks; adult emergence begins in mid-July and extends through the end of August.

The Rhyacophila coloradensis complex is discussed and a new species, amabilis, is added to the group. Two new species of Rhyacophila are described from California, spinata and ardala. Four new species of Limnephilus are described from California, bucketti, catula, atercus and neoacula; the first three represent interesting variations from described species. Several Limnephilus females are associated with the described males.

A number triangle system is presented which permits determination by simple addition of the Wilcoxon exact-solution numerators to indefinitely large values. Tabulated values of these numerators are included. This approach permits the range of applicability of the exact solution to be extended indefinitely, and has the advantage of requiring only a minimal mathematical background for its understanding. Combinations of these number triangles can be employed to yield exact solutions for samples involving tied ranks.

Uni- and bi-voltine strains of the eumenine wasps, Rygchium leucomelas (Sauss.), Ancistrocerus catskill albophaleratus (Sauss.), A. c. catskill (Sauss.), and A. tigris tigris (Sauss.) occur in the Black Sturgeon Lake region of Ontario. Another eumenine, Symmorphus cristatus cristatus (Sauss.), is univoltine. All the eumenids plug and divide their nests with partitions of clay. Generally, females emerge from cells larger than those of males. A double partition with an intervening space between cells is introduced occasionally in summer-generation nests and frequently in overwintering-generation nests. Generally, individuals of the bivoltine summer generations were predominantly female but overwintering generations were predominantly male.

All eumenine wasps, except S. c. cristatus, provision their nests with lepidopterous larvae. A broad spectrum of prey was utilized but at any given time the female wasp shows considerable fidelity in searching for prey on a given host plant.

Limited parasitism of the eumenids by the genus Chrysis and the ichneumonid genus Ephialtes was observed. The dipteran Amobia distorta Allen was found in nests of A. c. catskill and R. leucomelas.

A single species of pompilid, Dipogon sayi sayi Banks, occupied the trap nests in small numbers. The prey of this wasp consists mainly of spiders in the genus Xysticus.

The sphecids include Passaloecus ithacae Krombein, which was common, an unidentified Pemphredon sp., and Passaloecus mandibularis (Cr.). P. ithacae provisioned mainly with aphids of the genus Cinara; Pemphredon sp. utilized C. abieticola; and P. mandibularis preyed upon a wide range of species including several aphids from deciduous trees.

Partitions in Passaloecus nests were primarily resin but female P. ithacae often incorporated chips of pith. Cell sizes were frequently out of proportion to the volume of prey and the size of the wasp larvae. Limited parasitism by the chrysidid genus Omalus and the ichneumonid genus Poemenia was noted.

In recent years the pine needle miner, Exoteleia pinifoliella (Chamb.), has occurred in large numbers in jack pine plantations in southern Quebec. The female lays its eggs in late June and early July, and larvae, after moulting to the fourth instar, overwinter in the second needle mined. The following spring the larvae continue mining the needles in which they overwintered, moult for a fourth time, and attack a third needle, wherein they pupate. A description of all stages is given, and the habits and controlling factors of the insect are discussed.

Parablastothrix Mercet, which has been known only from the Palearctic, is represented in the Nearctic by Parablastothrix neorctica new species, which is described and figured. The type and allotype of P. nearcticus were reared from a species of Coptodisca Walshm. (Lepidoptera) mining leaves of Vaccinium arboreum Marsh. at Jackson, Mississippi. One paratype was reared from Obrussa sp. (Lepidoptera) at Morgantown, West Virginia, and the other collected in Livingston Co., Michigan.

Ten alfalfa clones, Medicago sativa L., were tested at 60°, 70° and 80° F. in Kansas and Quebec for resistance to pea aphid biotypes, Acyrthosiphon pisum (Harris), originating in the respective areas.

The resistance of the clones at the three temperatures varied differentially at the two locations. One clone was resistant at all temperatures to aphids of both locations. Results indicated that biotype C61-86 of the pea aphid at St. Jean, Quebec, is biologically different from the population of the same species in Kansas. Results also suggest the possibility of finding or combining clones so that varieties of alfalfa resistant to pea aphids over broad geographic areas and environmental conditions can be secured.

Ten species of predatory coccinellids representing seven genera were reared from the first-instar larva to the adult stage on dry powdered aphids. Dry pea aphids, Acyrthosiphon pisum (Harr.), and corn aphids, Rhopalosiphum maidis (Fitch), were both superior to bean aphids, Aphis fabae Scop., for growing coccinellid larvae. Though Anatis mali Auct. grew equally well on A. pisum and R. maidis, the larvae generally lived longer when starved after feeding on R. maidis. Dry aphids were as good as living aphids for growing A. mali and Coleomegilla maculata lengi Timberlake. C. maculata grew as well in darkness as in light, and an aphid–pollen mixture was superior to either component alone. Three generations of C. maculata were reared on a yeast diet and this diet is the most promising food for use to supplement natural foods in the field. An arrangement of coccinellid species on the basis of their food specificity does not correspond to the current phylogenetic arrangement, as the taxonomically primitive tribe Coccinellini contains both generalized and selective feeders.

A detailed description of the larva of Agrilus liragus Barter and Brown, and the distinctive characters of Agrilus anxius Gory are given with a short discussion on the taxonomic value of some morphological characters.

A technique for rearing Neodiprion sertifer (Geoff.) in individual isolation from egg to adult is described. Larvae so reared under optimal conditions experience mortality only slightly greater than that sustained by larvae growing in the normal feeding aggregations. The comparative capacity of the isolated larvae to withstand even slight departures from optimal conditions of food, temperature and humidity is low. These observations together with data on the responses of isolated and normal larvae to physical factors are discussed in their ecological context.

A new species of Pristiphora from Brazil is described and compared with the only other known species of this genus from South America. The phylogenetic relationship to other species in the genus is discussed.

Parkin (1942) reported the occurrence of pired epidermal structures containing fungal strands on the larvae of Sirex gigas (L.) and S. cyaneus (F.). He described the structures as “concealed in the deep fold between the first and second abdominal segments, and formed by local modifications of the cuticle and hypodermis on the posterior sides of the hypopleural folds of the first abdominal segments”. He referred to them as “hypopleural organs”.

Vol. 97, May 1965. Page 496, line 1 of Abstract — Archidipteron should read: Palaeodipteron

Page 502, line 15 — discondylic should read: dicondylic