A modification of the Livingstone piston sampler is described. The sampler employs the piston feature of the Livingstone device in conjunction with the rod and locking mechanism of the Davis borer. The sampler is used in different ways for loose...
Populations of the adult insects which emerged from Lake Opinicon, Ontario, were sampled by emergence traps from July 1-11, 1951. The average daily emergence per square meter of lake surface was 136 insects which had a fresh weight of 69.2...
