THE Simuliidæ or 'black flies' are represented in Britain by nineteen species. Their larvæ and pupæ are always aquatic, and the adult females are active blood-suckers. In the British Isles the attacks ...
THE manner in which a Simulium larva fixes itself to rocks and water weeds in very rapid running water has hitherto been a matter of dispute among naturalists. Some have supposed that the so-called ...
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