The Bulletin

The Bulletin

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: evidently passed in a few days, the insect during this time being nearly or quite inactive, often secreted under scales of bark or closely wrapped in their downy covering. Previous to the emergence of the imago, it usually crawls out of its hiding place. The outer covering splits on the median line over the front of head on the ventral side back to the prothorax or possibly further, on the dorsal side back the meso--or meta-thorax, and the imago crawls out slowly, the wings begin at once to expand and require but a few moments to reach their full size. In/taco. In this form or in the brood of winged individuals, the insect is very abundant in the latter part of May and early in June, and occasional ones may sometimes be found later. I have so far failed to distinguish males or females in this form, and have watched in vain to see copulation or any deposition of eggs. In the apterous form egg laying individuals may be found abundant in spring, rarely during the time of the winged form and occasionally during fall. This form may also be found during winter, usually slightly sheltered in crevices of the bark, and protected by its woolly covering. While it is possible some eggs may pass the winter in crevices on the bark, I have seen nothing to warrant Dr. Shimer's opinion that the normal winter condition of the species is in the egg and that these are on the ground. IN GENERAL. The lice are evidently influenced somewhat by exposure in their distribution as they will be found usually on certain parts of a tree or group of trees. Dr. Fitch says upon the north or shaded side of the trees and lower portions, where there is a constant shade, but though I have noticed this as a rule here, I have also observed a peculiar exception. This more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • United States
  • English
  • black & white illustrations
  • 1236775589
  • 9781236775580