[543] Linn. Trans. i. 196.
[544] Reaum. i. 545—.
[545] Pyral. 8. 3. t. iii. f. 16.
[546] See above, Vol. I. p. [172]—.
[547] Reaum. ii. 491.
[548] Reaum i. 540.
[549] See above, Vol. I. [167]—. II. [264.]
[550] See above, Vol. I. p. [67.]
[551] N. Dict. d'Hist. Nat. xvi. 269—. xxii. 76.
[552] Reaum. iv. 32. The author here quoted asserts that the grub of Ichneumon Larvarum L. retains its skin, which, he says, is so transparent that the form of the nymph can be seen through it. Ibid. ii. 447. De Geer, however, found that this really did cast its skin, which is so transparent as to be scarcely visible, by pushing it gradually towards the anus, where it soon dries up and cannot then be discovered. De Geer ii. 893—. According to Rösel the same circumstance attends the transformation of Coccinella renipustulata Illig. (C. Cacti Ent. Brit.), which at first perplexed him not a little. It is probable that in this case the retention of the skin was accidental; for some of the grubs of a Mycetophila, the transformation of which I observed, became pupæ within their last skin, while others wholly disengaged themselves from it. The cause of this variation, I conjectured, arose from the former being too weak to extricate themselves from the skin.