Two species of tartricid larvae, which were easily separated by appearance and by host, were reared by the author during the summer of 1951. Identification of adults showed that two species of Sparganothis had previously been associated with the name Sparganothis pettitana (Robinson). The true S. pettitana was identified by comparison of a series of male adults of both species with the illustration accompanying the original description (Robinson, 1869, Pl. IV) and with Type No. 7417 in the Brakenridge Clemens Memorial Collection at the Academy of Natural Sciences, Philadelphia, Pa.

The status of the mosquito Aedes pionips Dyar, 1919, has so far remained in doubt. The original description says in part, “Similar to lazarensis F. & Y. [=communis (Deg.)] but larger and more heavily marked.” Of the larva Dyar wrote, “…head hairs in fives; other characters essentially as in lazarensis.”

In 1928 Dyar wrote, “Where the two occur together, as is frequently the case, the communis are all out of the pools weeks before the pionips have matured.” Also, “This [pionips] is a derivative species of communis, but quite distinct.” In his keys he separated the females by colour and the larvae by numbers of head hairs; the males were not separated.

One very extraordinary phase in the development of certain polyembryonic encyrtids is the production of a precocious larval form. This anomaly appears while its normal sibs are still in an early embryonic stage of development, and although it leads an active parasitic life within the host it never succeeds in developing beyond the larval stage.

The following are descriptions of two new species of leafhoppers of the genus Dikraneura from Western Canada. Notes on other species found in that region are appended. Two of the latter, rubrala DeL. & C. and rufula Gill., have apparently not been recorded previously for Canada. Figures of the aedoeagi are provided, as this structure normally provides the only reliable specific characters and must be examined if specific identifications are required. The name Dikraneura is used here in the restricted sense, following Oman (1949), rather than in the broad sense of DeLong and Caldwell (1937), Beamer (1943), and others.

Length (male and female) 4.5 mm. Width 1.2 mm. Face slightly convex, vertex poinced, slightly more than right angled, 1½ times wider between the eyes than length at middle line. Pronotum twice as wide as long. Male plates spoon-shaped, curving upward at the tips. Female seventh segment evenly rounded at the sides, broadly excavated at the centre, with the usual strap-shaped projection, at the tip of which is a small V-shaped notch.

The program of biological studies and experiments in chemical control of mosquitoes at Churchill, Manitoba, in 1947 and 1948 (Twinn et al., 1948; Twinn, 1950) was extended in 1949 to include Goose Bay, Lahrador. The program at Goose Bay was primarily designed to develop control measures for the northern species of biting flies. since the control experiments were scheduled for definite periods during the summer in 1949 (Twinn et al., 1950), limited biological studies were carried on as circumstances permitted. These field studies produced information on the species of mosquitoes present and their development and ecology. Data obtained in 1949 from field observations, collections, identifications of adult and immature forms. and limited laboratory rearings are summarized in this paper. Additional data obtained by officers of the Division of Entomology in 1950 under similar circumstances have been included, in some cases as confirmation of observations in 1949.