This study was an attempt to discover, for the Greater Winnipeg district, what species of mosquitoes occurred, under what conditions, their seasonal distribution, and the relative abundance of each species. The field work and preservation of the material were done by the writer in conjunction with his duties, first as Senior Foreman in 1938 and later, in 1939, as Field Manager of the Winnipeg Anti-Mosquito Campaign.

In the past two years three distinct types of Coleophorid cases have been found in the Ottawa region in the early spring, attached mostly to the leaves of Aster tradescanthi or allied, thin-leafed species. Small series of moths have been bred from all three types of cases, the adults appearing in late June or early July.

In my original description of the above species I rather doubtfully associated with the male holotype and paratypes two females, largely on account of similarity of locality data; the genitalia of one of these was figured on Plate III, fig. 6. I now find that this association was incorrect and that the name quadruplex must be restricted to the male sex of the original description.

The two-striped grasshopper, Melanoplus bivittatus (Say), generally confines its egg laying to ditches, drift soil and crop margins, but during the autumn grasshopper egg survey in southern Saskatchewan in 1942, this species was observed ovipositing in exposed piles of wheat left in the grain fields at harvest time.

Male lappets vivid deep yellow. Dorsal and ventral sides of abdomen deep bright yellow with a narrow black band on the anterior margin of each segment. The appearance of the species is intermediate between eglanterina and hera, differing most conspicuously from these two in wing color. Primaries pale yellow faintly tinged with pink, but much less intense than in eglanterina. Secondaries brilliant yellow.