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; . economicentomolo00smit Year: 1906 lyo ^jv economic entomology. injurious to the agriculturist, the series may be, as a whole, accounted beneficial. In the Clavicor7iia we have a much greater diversity of form, and many families, differing widely in habit, and some of these are economically important. Fig. T40. A water-scavenger, HydrophUns ti is.—a, the larva ; b, male adult ; c, pupa ; d, opened, and e, closed egg case ;
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; . economicentomolo00smit Year: 1906 lyo ^jv economic entomology. injurious to the agriculturist, the series may be, as a whole, accounted beneficial. In the Clavicor7iia we have a much greater diversity of form, and many families, differing widely in habit, and some of these are economically important. Fig. T40. A water-scavenger, HydrophUns ti is.—a, the larva ; b, male adult ; c, pupa ; d, opened, and e, closed egg case ; /to /, 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 Gyrinidcs cannot be mistaken. They are black or bronzed, oval, shining, with un- usually long forelegs, and disport themselves in swarms on the surface of ponds and streams, darting here and there, or sometimes swim- 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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