Bulletin Volume 53-60

Bulletin Volume 53-60

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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. 1905 edition. Excerpt: ...GENERATION. The first generation at Centerville begins with the first eggs deposited, apparently about the last of June, by the adults developed from hibernating larvae and pupae. These eggs hatch in about 4 days after deposition. The principal egg-laying period for this generation is evidently between the latter part of June and the first part of August. It would appear that the length of time spent in the larval state is from 31 to 35 days. Sometimes, however, a few individuals of this first generation, either from retarded development or other causes, do not go through their transformations with the rest of the broods, but remain as larvae all through the fall and winter, evidently changing to pupte in the following spring. The length of time spent in the pupal stage is approximately 15 days. Pupae of this generation were observed in different broods from August 14 to September 6. The first adults, evidently of this generation, were observed in the bark August 14. The length of time spent in the bark after reaching this stage appears to be from 7 to 14 days. It is difficult to tell just when the emergences cease, as the last individuals of the brood come out scatteringly. Thus, on October 10 a few adults were still found in the bark. As this was the last observation, it is not known whether adults emerged later in the fall or whether they passed the winter in the bark before emerging; but the latter was probably the case. In one tree under observation eggs were deposited July 6 and the broods developed and emerged by August 28, a period of 53 days. Thus it appears (1) that the first generation begins with eggs deposited probably in the latter part of June; (2) that the majority of the broods develop and emerge by the first part of...
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Product details

  • Paperback | 290 pages
  • 189 x 246 x 15mm | 522g
  • United States
  • English
  • black & white illustrations
  • 1236799216
  • 9781236799210