American students have long used the name Thermonectes Crotch, 1873 (Trans. Amer. Ent. Soc., 4:402), for a genus of dytiscid beetles, and have accepted Crotch's designation of Acilius ornaticollis Aubé, 1838, as the genotype. This treatment overlooks three earlier references which establish a generic name for the same natural group of species.

The discovery of the “European spruce sawfly” in Canada in 1930 and the development of its destructive outbreak have been described (3). It was identified in 1931 as Diprion polytomum (Htg.), which became Gilpinia polytoma (Htg.) in 1939 as a result of Benson's revision of the genera of the Diprionidae. The work of parasite introduction (1) commenced immediately on the assumption that the insect was an importation from Europe.

For many years the nymph of Somatochlora walshii Scudd. has eluded our pursuit, in spite of the fact that its geographical range, unlike that of most of our Somatochloras, includes practically all of the settled parts of the eastern provinces and it is by no means a rare species in its special habitat–boggy streams and ditches.

The preceding part under this general title was published in 1941 (Can. Ent., 73:85-90). The majority of the novelties discussed herewith were collected by myself in the mountains of Colorado; for other specimens I am indebted to Professor Harry C. Severin, South Dakota State College; Dr. Charles D. Michener, University of California; and Dr. Alan Stone of the United States National Museum. Where not indicated to the contrary the types of the novelties are preserved in my extensive collection of these flies.

The discovery of an interesting species of Petalodes in a lot of Braconidae taken in British Columbia prompted the writer to submit a specimen to Dr. C. F. W. Muesebeck of the United States National Museum, for his opinion on the species, which from the literature seemed to be quite close to the genotype, Petalodes unicolor Wesm., of Europe.