C. A. Frost.
Polydrusus sericeus Schall.
Psyche 53(3-4):51, 1946.

This article at Hindawi Publishing: https://doi.org/10.1155/1946/83061
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19461 Dragonjlies as Enemies of the Stable-fiy 5 1 season, great numbers of dragonflies appeared in the air above the camp and within a few minutes the stable-flies had dis- appeared. Moreover they did not reappear during the several remaining weeks of our stay at Cedar Lake, although each evening numerous dragonflies were to be seen feeding in the air above us.
The dragonflies were not identified) but appeared to be a large species of Bschnid~ which appeared most abundantly at dusk, darting about in such numbers that we could occasionally'hear the impact of their bodies as they collided in the air. Midges and mayflies are extremely abundant since there are endless opportunities for them to develop in the lake as well as in the spruce swamps and the other marshy areas characteristic of the region. Dragonflies are likewise a conspicuous element of the insect fauna just as they are along our southern Atlantic and Gulf coasts. The stable-fly population at Cedar Lake, however, cannot compare to the almost incredible numbers which regu- larly infest our southeastern beaches.
The stable-fly is undoubtedly an old world species) possibly native to India) but was reported to be abundant in Philadelphia as early as 1776) and appears at present to enjoy a distribution about as wide as that of any insect.
This European species is listed in the Leng list as occurring in Indiana. In 1941 from May 25 to June 22 I took a number of them on poplar and again in F'ramingham in 1943 they were abundant on CoryZus ame~icana, poplar and maple near the same locality. This year (1945) they were again abundant especially on Corylus about June 10th. The European species of these green weevils are very numerous, or at least the names are, and the present species resembles many of them. Superficially they resemble large PoZydrusus impressij~ons Gyll.) PhylZobius pyri L. and also the green form of Scythropus elegans Coup. PhyZ- iobius giaucus Scop. is recorded from "Can." but probably this is a misidentification of P. pyri since the specimens from Mr. William Procter taken at Bar Harbor, Me., were first identified as P. gZaucus. - C. A. FROST




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