The serological relationships of Pissodes strobi (Peck) and P. approximatus Hopkins were examined using turbidimetric and immunodiffusion analyses. Hylobius pales Hbst. was used for heterologous comparisons. When turbidimetric analyses were performed using anti-strobi sera, heterologous reactions with P. approximatus were stronger than homologous reactions. Moreover, immunodiffusion tests substantiated this. These results appear to have broken a cardinal rule of serology: that hererologous reactions do not exceed homologous reactions in magnitude.These results could he due to a simple quantitative variation in the antigen extracts or to possible cross-reactivity between antigenically similar proteins. Another possibility is that the two populations are not separate species. Evidence obtained in this study seems to be in accord with cytological evidence obtained hi previous studies and does not support the designation of P. approximatus as a valid species.

The following technique employed at the Vernon Laboratory greatly facilitates the preparation of inflated larval specimens. Inflated larvae are dried over a reflector infra-red heat lamp (250 watts), clamped to a titration stand. The standard heat lamp with an aluminum reflector, and the red bowl heat lamp with a nickel reflector have been tested; the latter is preferable because it radiates more heat with reduced glare.

A method is described for mass-rearing Chrysocharis laricinellae (Ratzeburg) on larch casebearer larvae, employing a water culture system for tamarack. The rearing unit accommodates a well-defined episode (limited contact) in the interaction with its host. The yield is about 100 healthy parasites obtained from 300 cases, when the initial inoculum was 15 parasite females.

Dissochaetus cubensissp.nov. is described from Cuba. New forest and cave records are given for the previously poorly known species Proptomaphaginus apodemus Szymczakowski and Proptomaphaginus darlingtoni (Jeannel) from Cuba and Proptomaphaginus hispaniolensis Peck from the Dominican Republic on the West Indian island of Hispaniola.

A troglobite species, Quaestus (Quaestus) acuminatus sp.nov., from the Cantabrian Mountains (Province of Asturias, Spain) is described and illustrated. The taxonomic position is discussed and data on its isolation and geographical distribution are given.

The female and male of Asca acornis n. sp. are described and illustrated. This species occurs in arboreal habitats in the southern United States. The absence of the most salient diagnostic character of the genus Asca on adults of this species is discussed.

In a 3-year study, one annual application of a 10% granular formulation of disulfoton in the soil at a rate of 2 lb actual toxicant per acre controlled M. persicae throughout the entire period that aphids were most prevalent in pepper fields. Some control was observed within a few days of treatment, but effective control did not occur until 2 to 3 weeks after placement of the insecticide. Irrigation increased the initial uptake of disulfoton, but after 2 weeks the degree of control was essentially the same in irrigated and nonirrigated plots.Analyses of fruit samples from treated plots showed that there were no detectable amounts of disulfoton or its oxidation products 42, 50, and 60 days after treatment. These observations suggest that the required interval of 90 days between treatment and harvest could be reduced. Appreciable amounts of the insecticide or its oxidation products were present in the leaves on all sampling dates.

A key is given to nine species of Macrosiphum (Sitobion) on ferns in North America, including four new species: M. (S.) lambi new species from Athyrium filix-femina (L.) Roth, in Algonquin Park, Ontario; M. (S.) woodsiae new species from Woodsia ilvensis (L.) R. Br., Manitoba and Northwest Territories; M. (S.) clydesmithi new species from "bracken fern" (Pteridium aquilinum (L.) Kuhn), Utah and Oregon; and M. (S.) walkeri new species from Nephrolepis exaltata (L.) Schott., Arcadia, California.

The genus Misumenops F. Pickard-Cambridge, 1900 is represented in the Nearctic region by approximately 20 named species, most of which are restricted to the southwestern United States and northern Mexico. The new species described here brings to five the total known from eastern North America.

Two new species of the genus Lygus Hahn are described: potentillae from Canada, Alaska, and Colorado; and mexicanus from Mexico and Texas. Lygus abroniae Van Duzee is considered to be a typical member of the genus Lygus. The seasonal colour variations of the three species are noted, their relationships to other species in the genus are discussed, and their host plants are given.

This is, without doubt, the most beautiful of our leaf-eating beetles. It is nearly an inch in length (fig. 9), of a broad oval form, with the wing cases of a rich yellow color, with a pale metallic lustre, while the top of the head and thorax gleams like burnished gold of a briliant reddish cast. The nnder surface has a polished coppery hue, and is thickly covered with whitish wool ; this latter characteristic having suggested its specific name lanigera (wool-bearer).

The existence of a diurnal cycle in the rate of production of acoustic signals by aquatic heteropterans has been observed by several workers (Leston 1955; Mitis 1936; Schaller 1951; Theiss 1983). These accounts all mention an increase in acoustic activity in early evening. Jansson (1968, 1973) determined that the single strongest component releasing acoustic behavior was light level in the genera Cenocorixa and Callicorixa and that different species of Cenocorixa had different maxima. The study reported here began as an examination of diel periodicity of song incidence in the corixid bug Palmacorixa buenoi but results were substantially different in kind from most other studies of this nature in the literature.

This study of the taxonomic units comprising the genus Odontaeus Dej. has occupied, for the past three years, by far the greater part of such time as I can devote to entomology, and yet it is with a feeling of dissatisfaction that the following conclusions are offered to coleopterists.

A new species, Chironomus athalassicus, is described from saline lakes in south-central British Columbia.