Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . dult ; 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 familiesof aquatic Clavicornia, the Hydvophilidce, or water-scavengers,and the Gyrinidce, or former resemble the water-tigers ingeneral appearance, but are more convexabove and more flattened below, usually withbrightly-polished wing-covers. The differ-ence in the form of the antennae will easilypreven
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . dult ; 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 familiesof aquatic Clavicornia, the Hydvophilidce, or water-scavengers,and the Gyrinidce, or former resemble the water-tigers ingeneral appearance, but are more convexabove and more flattened below, usually withbrightly-polished wing-covers. The differ-ence in the form of the antennae will easilyprevent confusing the families. The Gyrinidce cannot be mistaken. Theyare black or bronzed, oval, shining, with un-usually long forelegs, and disport themselvesA whiriigig-beetie ^^ swarms on the surfacc of ponds and streams,(i)anditsiarva(2):nat- darting here and there, or sometimes swim- tiral size. • ..... ,, , ming rapidly m large or small, regular orirregular circles, whence they derive their whirligig appella-tion. They are predaceous in all stages, but of no agriculturalvalue from their strictly aquatic THE INSECT WORLD. 171 The family Silphidcs, containing what are popularly known ascarrion and burying beetles, is in sharp contrast to any-thing heretofore spoken of, and here the antennae are capitate,—, terminated by a spherical or ovate knob abruptly formed,like a head. The beetles are usually found on or about carrionof all kinds, though some of the smaller forms live in decayingfungi. In the large species there are two distinct types, repre-sented on the one hand by the genus Siipha, in which the species FiG. 142.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
