The species ol the genus Matus are as yet known only from America north of Mexico and may be separated from all other Dytiscidae of this area by the following combination of characters: Length 7 to 9.5 mm.; color brownish-red to piceous; scutellum visible; eyes emarginate above the bases of the antennae; metatarsal claws of unequal length; prosternum and its process on a plane, almost flat, and with a longitudinal median sulcus.

In rearing the lepidopterons leaf miner Coptodisca arbutiella Bsk. from the leaves of the Madrona (Arbutus menziesii Pursh.) at Vancouver, B. C., Mr. W. G. Mathers and Professor G. Spencer obtained specimens of a Braconid parasite which on examination proved to be an undescribed species of the genus Mirax. The species in question is very similar to Mirax ectodemiae (Roh.) and examples were submitted to Dr. C. F. W. Muesebeck who has kindly compared them with ectodemiae and has supplied additional data concerning that species.

The preceding part under this general title was published in 1940 (Can. Ent., 72:151-155). The new species described at this time were collected by Messrs. A. E. Brower, R. E. Nye, G. F. Knowlton and H. D. Pratt, and by Dr. Marion E. Smith. I am very greatly indebted to all of the above for the privilege of retaining the type specimens in my extensive collection of these flies.

Palpi metallic blackish, smooth scaled, second joint with very slight apico-ventral tuft. Antennae simple, black, with apical seventh white, basal segments moderately swollen.

Ater several seasons of collecting, it has become evident that Gluphisia lintneri Grote and G. avimacula Hudson, which both occur at Ithaca, are not forms of the same species, as they do not fly at the same time, lintneri being on the wing about a month before avimacula, the former occurring in late April and the latter in late May, and this lapse of time between the two periods of flight of the forms does not constitute enough for the production of two broods.