. Economic entomology. Beneficial insects; Insect pests; Thysanura. 2 24 ARACHNOIDEA, CASE bending the head down upon the under side, so that when it chooses it can, hke some beetles, retire entirely into its shell and shut it up, looking then like a tiny, oval, brown speck, without head, legs, or any other members visible. Claparede found this little creature in the burrows or borings in rotten fir wood; but he also sometimes found in them, but rarely together, another larger, semi-transparent, soft, white mite, like a cheese mite. The idea which would naturally occur to anyone would be that
. Economic entomology. Beneficial insects; Insect pests; Thysanura. 2 24 ARACHNOIDEA, CASE bending the head down upon the under side, so that when it chooses it can, hke some beetles, retire entirely into its shell and shut it up, looking then like a tiny, oval, brown speck, without head, legs, or any other members visible. Claparede found this little creature in the burrows or borings in rotten fir wood; but he also sometimes found in them, but rarely together, another larger, semi-transparent, soft, white mite, like a cheese mite. The idea which would naturally occur to anyone would be that this might be the larva; but then it had eight legs, and therefore it was assumed must be a perfect insect; and, moreover, by watching the hatching of the eggs deposited by the Hoplophora, Claparede soon ascertained that, as usual, the first stage was a six-footed soft white mite, bearing a close resemblance to the eight-footed, soft, white Acaroid form. What relation did the latter bear, then, to the Hoplophora with which it was associated ? M. Claparede solved this by the following experiment: He took twenty speci- mens of the soft white Acaroid mite, and placed them upon a morsel of decaying pine wood, first taking care to see that there were no other mites present. He then put the wood in a moist flask, Hoplophora contractiiis ^hich hc allowed to reuiaiu undisturbed for three cilpar^;' wceks. Aftcr that time he took the wood out of the flask. The mites were scarcely to be seen. They had penetrated by boring, and he had to dig them out. On examination he found only twelve specimens resembling Acarus against seven Hoplophora. A transformation of seven had thus taken place, and one individual was missing. However, the nature of the transformation was not yet clear. He repeated the experi- ment in which he, at the same time, included a larger number of specimens. So he followed the traces of the transformation. His researches into the development of Hypopus, of w
Size: 1229px × 2033px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondonchapmanandha
