Charles Darwin

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) He has written on the phosphorescence of fire-flies, and on the habits of the larva of one of them Lamphyris occi- dentalis. (Ibid. , pp. 29, 30. ) He discussed the food- habits of stercovorous beetles, with reference to the origination of a new habit and the power of adapta- tion to new conditions. (Ibid. , p. 490, note. ) At Port St. Julian, Patagonia, he found a species of Tabanus extremely common, and remarks : " We here have the puzzle that so frequently occurs in the case of mosquitoes ...on the blood of what do these insects commonly feed ? The guanaco is nearly the only warm-blooded quadruped, and is found in quite inconsiderable numbers compared with the multitude of flies. " He has discussed the question of hibernation of insects, and shown that it is governed by the usual climate of a district, and not by absolute temperature. (Ibid. , pp. 98, 99. ) He gave the first true explanation of the springing power of the Elaterida when laid on their backs, showing how much depended on the elasticity of the sternal spine.

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