In 1930, the spruce sawfly, Diprion polytomum (Hartig), was found severely defoliating spruce trees in the interior of the Gaspe Penninsula in Quebec. At that time it was estimated that some 2,500 square miles were affected. Since then the infestation has increased in intensity and extent, and in 1936 the sawfly was known to be present throughout most of the spruce forests of north eastern America from the eastern boundary of Ontario to Nova Scotia (I).

The species description presented is based on specimens taken by E. R. Tinkham from the long-billed curlew (Numenius americanus Wils.) collected at Presidio, Texas, May 26, 1929. The specimens are a part of the University of Minnesota collection which has been loaned to the writer for study and identification during the past few years. I am deeply indebted to Prof. C. E. Mickel for his kindness in regard to the loans from the Minnesota collections.

Cases of human myiasis have been recorded, on various occasions, from a number of widely scattered localities in Alberta. In several instances the causative larvae have been placed in alcohol and sent to this department for identification.

The following report deals with species of Macrosiphum collected upon Chrysothamnus and Gutierrezia in Utah and nearby areas of the West.

♂ ♀.—Thrassis desertorum belongs to that section of the genus which is characterized by having metatarsal segment I equaling or slightly exceeding II. In this species metatarsal segment I equals II and III together. The labial palpi exceed the fore-trochantera. The lower genal row consists of 3 bristles ; the upper bristle is located higher than the eye; the middle, and smallest, one is inserted closer to the upper than to the lower genal bristle.

This subgenus has a rather peculiar distribution, one species having been described from equatorial Africa and one from Europe. It is therefore of interest to record a new species from Ithaca, N.Y. The following key will serve to distinguish these species.

The females of these two species are markedly different in colour, yet the males resemble each other so closely that Bradley (1913) was unable to distinguish between them. Waterston (is Chrystal, 1928) separated the males by the proportions of the hind metatarsus ; that of U. albicornis F. was “barely five times as long as broad,” while in U. flavicornis F. the metatarsus was “nearly seven times as long as broad.” However, Waterston had but two males of one species, and the metatarsal proportions vary intraspecifically ; on this account, the value of the character cannot be determined without a long series.