. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. xix] AND BIOLOGICAL METHODS 357 The burner is an ordinary kerosene fount, such as is used in incubators. The boards should be turned every few hours, to equahze the heating. I have a series of the glorious red Lathrecista festa, taken at Cooktown in 1907, which are as brilliant to-day as when I caught them. This species turns dull brown if treated in any other way. Overheating (above 110° Fahr.) must be avoided, since it causes an unnatural iridescence of the wings. The only safe way to preserve the brilliant blues of Arjr
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. xix] AND BIOLOGICAL METHODS 357 The burner is an ordinary kerosene fount, such as is used in incubators. The boards should be turned every few hours, to equahze the heating. I have a series of the glorious red Lathrecista festa, taken at Cooktown in 1907, which are as brilliant to-day as when I caught them. This species turns dull brown if treated in any other way. Overheating (above 110° Fahr.) must be avoided, since it causes an unnatural iridescence of the wings. The only safe way to preserve the brilliant blues of Arjrionidae is to keep a few specimens always in 70 per cent, alcohol, in the dark. Larvae. The best method of collecting live larvae is by using a small dredge-net. I use an ordinary 8 inch iron hoop, in one piece, with a strong ferrule and a bag of mosquito-netting, not too deep. With a stick four or five feet long, the water-weed, debris and bottom of any pond or river can be easily worked, and the larvae picked out. For some localities, a straight sharp edge is useful on the net, for running along a hard rocky Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tillyard, Robin John, 1881-1937. Cambridge [Eng. ] : University Press
Size: 1086px × 2302px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeenguniver
