The new genus described in this paper is based upon a specimen in a collection made by Prof. V. E. Shelford in Southern California. It pertains to the group for which I, some years ago, erected the family Sogonidae, the known representatives of which occur in Mexico and adjoining parts of the United States. The new genus may be placed among those previously known by means of the following key.

Since the appearance of the article on the difficult truncata-citrata group of this genus by Swett (1917, Can. Ent., XLIX,, 64) and by Barnes and McDunnough (1917, Contr., III, (4), 227, Pls. XXI, XXX; 1918, Contri., IV, (2), 137) little has been published concerning the North American representatives with the exception of the addition of a couple of new form-names by Wright and Blackmore. In the European literature several important papers, however, dealing with the Palaearctic species of the genus, have appeared; chief among these is the very comprehensive Monograph of the Palaearctic Species by Dr. P. Heydemann (1929, Mitt. Munch. Ent. Gesells., 207-292, Pls. I-XV) copiously illustrated with figures of the adults and of the genitalia, both male and female.

Macrocentrus gifuensis Ashm., a polyembyronic, braconid parasite of the European corn borer, Pyrausta nubilalis Hubn., has been reared in the laboratory at various times over a period of years by the author both for liberation and for experimental purposes. The technique used in rearing this parasite is similar to that used for some other corn borer parasites. No account of this technique has appeared in the literature to date, and it is felt that a description of the method used for rearing M. gifuensis might be useful to others at this time.

The extent and intensity of the present infestation of the spruce budworm, Archips fumiferana Clem., in eastern Canada has become a problem of immense national concern (I). The necessity for further knowledge in formulating adequate control programmes has emphasized the importance of considering the possible utilization of natural insect parasites. As part of the more conprehensive study of control being carried on by the Federal Division of Entomology, the Dominion Parasite Laboratory in cooperation with the Forest Insect Unit instituted a programme of parasite introduction in 1943.