During the summer of 1947 n project was initiated with the object of determining the earliest and latest dates of appearance and the period of appearance of maximum numbers of the various species of insects which emerge as adults from the Dundas Marsh, Hamilton, Ontario. Previous to this, during the summer of 1946, observations were made on the occurrence of various insects on the marsh. Such observations were continued during 1947 and are reported herewith.

It has been brought to my attention by G. E. Bucher, that in my note on the generic assignment of the spruce budworm Choristoneura fumiferana Clem. (Can. Ent. LXXIX: 21, 1947) I cited the genotype as Tortrix rusticana Treit. This citation is a laps. cal. for Tortrix diversana Hbn., the correct genotype as contained in my original manuscript.

Early in March of 1948 I was asked by a member of the staff of the Royal Ontario Museum of Zoology, Toronto 5, Canada to identify the fleas in their collection. Never having worked fleas east of the Rocky Mountains or to any extent in British Columbia I suggested that the collection be sent to a Canadian specialist or to Dr. Karl Jordan of the British Museum. I was not in the least displeased, however, when on the first of April a packet containing the collection arrived at my home in Tigard, Oregon.

While on a short visit in northern Maine during the summer of 1946, I collected a new and interesting ant of the Microgyna group of the genus Formica. The description follows below:

Formica dirksi sp. nov.

Deälate queen, total length 5.1 mm. Head, maximum width through eyes 1.2 mm., at base of mandibles 0.78 mm., length to anterior border of clypeus 1.3 mm. Thorax, Weber's (1938: 155, footnote) measurement 2.1 mm. General characters of the Microgyna group. Mandibles 7-toothed. Clypeus evenly rounded in front, with uneven surface and carina just barely distinguishable as a line anteriorly, but becoming a low blunt ridge through the mid-region and disappearing posteriorly. Head, excluding mandibles and eyes, somewhat longer than broad; narrower in front than in behind, with posterior corners evenly rounded, posterior border and sides slightly convex. Antennae of medium size, scape slightly stouter apically than basally, bent slightly and gradually in basal half, joints 2 and 3 of funiculus distinctly longer than broad; the apical joints only slightly longer than broad. Frontal area distinct, subtriangular, and about twice as broad at base as high. Frontal carinae diverging posteriorly, about as long as width of frontal area. Eyes black, more or less oval, strongly convex, remote from mandibular insertions and close to posterior corners of head. Ocelli medium-sized, round, white and forming an isosceles triangle with a base, which is situated posteriorly, equal to 0.24 mm. Ratio of base to the shorter sides is 10 to 7.

In examining a long series of several species of blackflies collected in Algonquin Park, Ontario, it was found that characters, often key characters, used in identifying adults as well as pupae showed variations from those described by previous authors.

During the course of revisional studies of the tribe Larvaevorini, a number of undescribed species were received from outside sources. Rather than delay the return of specimens, and on the chance that the final revision will not be published for some time, the descriptions of these new forms are given below.

Juriniopsis aurifrons new species

Until the present only one species of Juriniopsis, adusta Wulp. (floridensis Tns.) has been recognized from the United States. The new species, which ranges in Arizona, New Mexico and Utah differs from adusta Wulp. in the following characters: female front tarsus slender (widened and flattened in adusta); male vertex 0.35 head width (0.27 head width in adusta); parafrontals subshining yellowish with yellowish or brownish-yellow pollen (subshining bluish-grey with greyish or yellowish-grey pollen in adusta), and in the structure of the genitalia.