Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . in cases which they make ofbits of sticks, moss, l^ves, stones, shells, or other material, heldtogether by silken threads with which the entire inside of thehabitation is lined. Frequently the cases are roughly and irreg •ularly constructed ; but as often they are marvels of skilled work-manship. SmallFig. 44. stones are fitted so carefully that nobreak as large asa needle-point oc-curs, and some-times they mimicshells so closelythat conchologistshave been deceivedinto believ
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . in cases which they make ofbits of sticks, moss, l^ves, stones, shells, or other material, heldtogether by silken threads with which the entire inside of thehabitation is lined. Frequently the cases are roughly and irreg •ularly constructed ; but as often they are marvels of skilled work-manship. SmallFig. 44. stones are fitted so carefully that nobreak as large asa needle-point oc-curs, and some-times they mimicshells so closelythat conchologistshave been deceivedinto believing themsuch. In thesecases the larvae live,and from them theyobtain their com-mon name caddice or case-flies. Whatever the form of thecase, the insect lives in and carries it about everywhere through-out the larval life, crawling about under water by means of thelarge legs and keeping the soft, white, hind body constantly pro-tected. Some live in ponds or sluggish streams, others in rapidbrooks and torrents ; some are vegetarians, some are predatory,feeding on other larvae or even on small fish. Some forms con-. A caddice-fly, Limnophilus rhombicus, its larva, and at athe larval case. THE WORLD. 79 struct effective nets in which very young fish become entangledand fall easy victims to the insect fishermen. Streams in whichthese kinds of caddice-flies are abundant are not easily stockedwith fish unless the fry is so well grown as to be out of dangerfrom this source. Practically, the insects are of no importanceto the aQ:riculturist. CHAPTER IV. THE ORTHOPTERA. Grasshoppers, Crickets, Katydids, etc. The order Orthoptera, or straight-winged insects, includesthose forms with biting mouth parts and an incomplete meta-morphosis, commonly known as earwigs, grasshoppers,locusts, crickets, and roaches. The distinctive characters, aside from those just mentioned,are that the fore-wings are firmer in texture than the secondaries,and that the latter are folded fan-like, or plait
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
