Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 A water-scavenger, Hydrophilus triangularis.—a, llie larva ; b, male adult ; c, pupa ; d, opened, and e, closed egg case ; y to i, enlarged structural details of the adult. First, joining to the aquatic Adephaga there are two families of aquatic Clavicornia, the Hydrophilidce. or ' water-scavengers,' and the Gyrinidce, or 'whirligig-beetles.' The former resemble the water-tigers in general appearance, but
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 A water-scavenger, Hydrophilus triangularis.—a, llie larva ; b, male adult ; c, pupa ; d, opened, and e, closed egg case ; y to i, enlarged structural details of the adult. First, joining to the aquatic Adephaga there are two families of aquatic Clavicornia, the Hydrophilidce. or ' water-scavengers,' and the Gyrinidce, or 'whirligig-beetles.' The former resemble the water-tigers in general appearance, but are more convex above and more flattened below, usually with brightly-polished wing-covers. The differ- ence in the form of the antennae will easily prevent confusing the families. The Gyrinidce cannot be mistaken. They are black or bronzed, oval, shining, with un- usually long forelegs, and disport themselves ifhiriigig-'-beetie i' swamis OH the surfacc of ponds and streams, (1) and its larva (2): nat- darting here and there, or sometimes swim- ural size. • • 11 • 1 11 1 ming rapidly in large or small, regular or irregular circles, whence they derive their 'whirligig' appella- tion. They are predaceous in all stages, but of no agricultural value from their strictly aquatic habits.
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Photo credit: © Bookworm / Alamy / Afripics
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