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Updated: May 28, 2025
Whirligig beetles are said to be particularly destructive to Anopheles larvæ and many other insects such as water-boatmen, back-swimmers, etc., feed on the larvæ of various species. A few of these introduced into a breeding-jar with Anopheles larvæ will soon destroy all of them, even the very young bugs attacking larvæ much larger than themselves.
"They must eat something," said the boy; "they're used to it at home; and I wish you wouldn't be always cramming Grandfather down my throat. I want to do my aquarium my own way; and I gave most towards buying the bell-glass, so it's more mine than yours." "Well, do as you like; only let us have plenty of water-boatmen," said Molly.
Here he is crawling in mud under the water this May morning: out over the pond shoot the flat water-boatmen, and the water-spiders dance and skip as if the pond were a floor of glass; while here and there skims a blue dragon-fly, with his fine, firm wings that look like the thinnest gauze, but are really wondrously strong for all their delicate appearance.
The deep places were rich with tangled weeds, and in them fishes lurked to me they were big fishes water-boatmen and water-beetles traversed the calm surface of these still deeps; in one pool were yellow lilies and water-soldiers, and in the shoaly places hovering fleets of small fry basked in the sunshine to vanish in a flash at one's shadow.
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