This paper deals with a few examples of abnormalities found in a few insects which have come to the writer's observation.

In all the Phyla or major groups of the animal kingdom there are cases of abnormalities, monstrosities, anomalies or whatever term you choose to use which indicates a deviation from the normal trend in the development of an organism. Man himself is not exempt.

From the fact that the external morphology of the organism is noticeably changed, there must also be some internal abnormal conditions to bring about these changes. Each time this occurs in an organ of a specialized organ system it tends to change the symmetry of that particular organ.

Une région aussi étendue et variée que le parc du Mont Tremblant fournit à l'entomologiste comme à tout naturaliste d'ailleurs, un domaine quasi illimitt à de patientes et fructueuses recherches. La superficie actuelle de ce territoire forestier voisine les 700 milles carrés. Les plus hauts sommets des Laurentides, au nord de Montréal, émergent de cette région. La partie méridionale est formée par les bassins supérieurs de cinq rivières d'importance: les rivières Rouge, Macaza, Cachée, du Diable et Boulé; d'autre part, toute la partie septentrionale envoie ses eaux dans la rivière Mattawin, affluent du Saint-Maurice. Les hauts plateaux du parc servent donc de réservoir à six grandes rivières. Ses bornes se trouvent entre les 46° et 47° de latitude et les 74° et 75° de longitude.

At the Lethbridge laboratory, uncut wheat stems infested by the wheat stem sawfly, Cephus cinctus Nort., were collected in August, 1952, and incubated in sealed vials at room temperature for emergence of parasites. In October, 1952, three adult parasites (two females, one male) emerged. These specimens were identified as of Scambus detritus (Holmg.), Ichneumonidae, by Mr. G. S. Walley, Division of Entomology, Ottawa.

Early in the summer of 1949 reports were received that in various parts of Ontario and Quebec, particularly about dairy barns and stables, DDT residual sprays were not controlling the house fly, Musca domestica L. A preliminary investigation of these areas during that summer confirmed chat, in most instances, DDT applied as a residual spray was not giving satisfactory control. The DDT residual applications had been used at these dairy farms since 1946 and, in general, the insecticide had been properly applied. NevertheIess, a decline in control was noticed during 1948, even though the insecticide was applied more frequently than in previous years. Accordingly, studies were conducted on collections of these flies to ascertain whether shains of flies resistant to DDT had developed in Canada and, if so, to what degree.

The pine needle scale is a serious pest of spruce and pine in shelter-belt and ornamental plantings in the agricultural region of the Prairie Provinces of Canada. The present study was made to provide accurate data on the life cycle, habits, and seasonal development of the pine needle scale in this region. This information is essential for investigations of artificial control.

Observations were made at Indian Head, Sask., in 1947. The populations sampled were on Scotch pine in a shelter belt and white spruce in an ornamental planting. Other populations were sampled when further information was required.