. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. 170 AN ECONOMIC ENTOMOLOGY. injurious to the agriculturist, the series may be, as a whole, accounted beneficial. In the Clavicornia we have a much greater diversity of form, and many families, differing widely in habit, and some of these are economically important. Fig. A water-scavenger, Hydrophilus triaii'^nlajis.—a, Ihe larva ; h, male adult ; c, pupa ; d, opened, and e, closed egg case \fto i, enlarged structural details of the adult
. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. 170 AN ECONOMIC ENTOMOLOGY. injurious to the agriculturist, the series may be, as a whole, accounted beneficial. In the Clavicornia we have a much greater diversity of form, and many families, differing widely in habit, and some of these are economically important. Fig. A water-scavenger, Hydrophilus triaii'^nlajis.—a, Ihe larva ; h, male adult ; c, pupa ; d, opened, and e, closed egg case \fto i, enlarged structural details of the adult. First, joining to the aquatic Adephaga there are two families of aquatic Clavicornia, the Hydrophilida;, or " water-scavengers," and the Gyrinidce, or "; 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 A •' whiriigig"-beetie i'^ swarms OH 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, John Bernhard, 1858-1912. Philadelphia : J. B. Lippincott Co.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1896
