The male and female reproductive organs of the mountain pine beetle, Dendroctonus monticolae Hopk. are described, and interpretations given for functions of the parts on the basis of activity during mating, sperm transfer, egg formation and ovulation. Some morphological changes of the reproductive organs during the adult life cycle are also noted.

Three pairs of accessory glands associated with spermatophore production are evident in the male beetle. One of these was previously termed the seminal vesicles. A complex musculature operates the male genital organ during copulation. The female organs have four telotrophic ovarioles with a posterior calyx region that has a possible secretory function. Evidence indicates that organs previously termed "colleterial glands" have a digestive and reabsorbing function. The bursa copulatrix may be more closely allied with the function of the accessory glands than with the mating process. Parts of the spermatheca have been more precisely defined according to function.

The genus Aceodromus is redefined on the basis of the type species, A. convolvuli Muma, and a new species, A. asternalis, both of which are described and illustrated. The subfamily Aceodrominae Muma is removed from the Phytoseiidae and synonymized under the subfamily Blattisociinae (Blattisociidae), and reasons for this action are discussed.

Correlation coefficients were calculated for the estimates of insect density obtained by radiographs versus dissection, and for the estimates obtained by radiographs versus radiographic guided dissection. Estimates of numbers of siricids in white fir obtained by the two methods were closely correlated. The radiographic methods are more accurate than dissection alone, and also faster and cheaper.

Improved techniques are described for cleaning gauges used in measuring the oleoresin exudation pressure (o.e.p.) of large numbers of ponderosa pines. These techniques are being used in a study of the relationship of o.e.p. and bark beetle attack in westside Sierra coniferous forests. Standard hydrostatic pressure gauges (Bourdon type) were modified by the addition of a threaded extension made of steel rod which permitted both insertion into a tree and newly-designed cleaning rack. A 9/32-in. hole in the steel rod reduced to a minimum the amount of oleoresin exudate necessary for an accurate reading. The cleaning racks, each accepting 30 gauges, were capped to confine the solvent (xylene) under pressure.

Thousands of lepidopterous larvae representing a wide range of species are collected every year in Ontario by the Forest Insect Survey. Many of these require microscopic examination for identification. During a 10-year period I have only found one specimen with an extra pedal appendage.

In June 1963, a larva with an extra anal proleg on the right side was collected by H. G. McPhee near Thessalon, Ont., on the north shore of Lake Huron. The species was Epinotia solandriana Linn., a leaf roller on white birch, Betula papyrifera Marsh. A subsequent large collection from the same area contained only normal specimens.

The species of leafhopper described belongs to the obliqua group and the dorsal colour pattern consists of the usual oblique stripes of reddish pigment so typical of this group. The species most closely resembles E. aspera from which it can be distinguished by differences in the male genitalia. The preferred hosts are apparently Betula spp.

Carabid beetles found in agricultural lands in the Belleville district in 1959-62 are listed, together with notes on their habitats, relative abundance, and months of occurrence. Twelve of the 159 recorded species were sufficiently numerous to warrant investigations on their possible use as control agents for particular crop insect pests.

Two leaf-spot- and spider-mite-resistant varieties of sugar beets, GW 674 and GW 359, exhibited resistance to the development of populations of the sugar-beet root aphid, P. betae. GW 674 is a selection of GW 359 but has higher sugar content and greater leaf-spot resistance. Nine other varieties were susceptible to root aphid infestations.

A new anholocyclic species from the coastal region of western North America on Abies amabilis (Dougl.) Forbes and A. grandis (Dougl.) Lindl. is described. This is the first species of Pineus found on true firs.

Cliniodes Guenée = Idessa Walker is an odontiine genus related to Metrea Grote. Pylartes Walker is removed from synonymy and placed in Pyraustinae near Diaphania. Cliniodes totuanalis Schaus is transferred to Pylartes. Basonga Möschler is separated from Cliniodes but kept in Odontiinae, as is Sobanga, new genus, type-species Glyphodes rutilalis Walker = G. suavis Felder. Metrea is compared with Cliniodes, and is restricted to M. ostreonalis Grote. Leucochroma ? nebulalis Walker is removed from Metrea and made the type-species of the new pyraustine genus Ametrea. M. aripanalis is transferred tentatively to Pycnarmon in the Pyraustinae. Niphostola punctata, placed by Hampson under Metrea in the British Museum collection, should remain in Niphostola. The genus is transferred to Pyraustinae from Nymphulinae.

Pyrausta glaucescens Hampson, P. costimacula Hampson and P. egcarsialis Hampson are transferred to Cliniodes, the last as a synonym of C. rubialalis Dognin. Exarcha Lederer is transferred from Pyralinae to Odontiinae, its type-species becoming C. ineptalis (Lederer).

The following species of Cliniodes are described as new: C. nacrealis, Hispaniola; C. vinacea, Bolivia; C. malleri, Brazil; C. latipennis, Bolivia.

Notes and illustrations of the life history of the pterophorid moth, Oidaematophorus phaceliae McD., are given, and former errors of determination are corrected.

In laboratory experiments wettable and emulsifiable malathion and Perthane were most toxic to adult T. vaporariorum and progressively less so to the larval stages in order of development. Eggs were not killed. Perthane was most toxic at low temperatures, malathion at high temperatures. Malathion was more toxic than Perthane and the emulsifiable formulations of both more toxic than the wettable formulations. Against first-instar larvae, at the LD50, level, 70% maneb and 50% Perthane wettable powders were equally toxic but 65% zineb wettable powder was less toxic. Against adults, 70% maneb and 65% zineb wettable powders were one-half and one-third as toxic as 50% Perthane wettable powder at the LD50, level. Tests of spray mixtures against larvae with either 25% malathion or 50% Perthane wettable powders added to either 70% maneb or 65% zineb wettable powders showed neither synergistic nor antagonistic effects.

The Rhagio dimidiatus group in western North America consists of four species, all but one polytypic. Traditional taxonomic procedure has not been successfully applied to this complex, since the component taxa are variable and often poorly defined. Consequently, a quantitative approach, involving deme-by-deme comparison on the basis of the ten most significant differentiating characters, and interpreted in the light of geographic distribution, is used. The group is reviewed, a key presented, and the included forms described. New taxa are: R. maculifer styx, Montana, R. m. byersi, California, R. expansus expansus, Oregon, California, and R. e. franciscanus, California. R. dimidiatus albibarbis (Bigot) and R. maculifer concavus Leonard are given new status as subspecies.

Experiments show that A. tepidariorum selects sites for web building by a series of movements that are random with respect to the distribution of its prey. If selected sites fail to yield an adequate supply of prey they are quickly abandoned. If adequate supplies of food are forthcoming at a site, random movements cease and the site is systematically searched by filling the area with web. Light plays no part in the selection of web sites, but other extrinsic features, for example air currents, play an important role.

Aggregating habits and seasonal occurrence of two species of deer nasal bot flies (Cephenemyia apicata and C. jellisoni) were studied through two seasons in California. Males aggregated at upper hillside and summit stands of Castanopsis sp. and Quercus sp. rising 2-10 feet above the top of surrounding scrub vegetation. Activity began at 20 °C. air temperature and ended soon after mid-day.

Intraspecific and intrageneric chasing by male flies is described and the spacing of flies at different sites is discussed. C. jellisoni males appeared to dominate males of C. apicata at these sites or, when both were present, their activities were stratified. Marked males tended to remain at a specific site throughout the day's activity.

In one observed mating, the flying pair united above the aggregation site and dropped in tandem to the vegetation below. A comparative description of the internal reproductive system of female C. apicata is given.