. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . J It I J Head of wasp, to show regions: a, ''^^ tT .fcO' •^C^'' compound eyes; b, clypeus; c, la- Antennal types; a, moniliforin ; /5, joints ciliated; brum; rf, mandibles; .?, ocelli;/", place c, bristle-tufted ; rf, plumose; ^, setaceous. where antennae are inserted. segments set in at right angles to it. Usually an elbowed an- tenna is also clubbed at the tip, and so we divide the structure into "a scape" at the base, the "club" at th
. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . J It I J Head of wasp, to show regions: a, ''^^ tT .fcO' •^C^'' compound eyes; b, clypeus; c, la- Antennal types; a, moniliforin ; /5, joints ciliated; brum; rf, mandibles; .?, ocelli;/", place c, bristle-tufted ; rf, plumose; ^, setaceous. where antennae are inserted. segments set in at right angles to it. Usually an elbowed an- tenna is also clubbed at the tip, and so we divide the structure into "a scape" at the base, the "club" at the tip, and the " funicle" embracing the intervening portion. The feelers may be clothed with fine, soft, more or less dense hair, and are then pubescejit; or furnished with lateral hairs of moderate length set in regularly, and are then ciliated or fringed ; or they may have single or bunches of stiff bristly hair, and are then said to be bristled, or bristle tufted. These are all the movable appendages of the head, and there remain only the organs of sight, which are perhaps better con- sidered under the heading of sense organs. It is only necessary to say here that the compound eyes are often very prominently developed, and that they are usually set at the sides, often form- ing the greater portion of the head itself The ocelli, on the other hand, are always very small structures ; in the adults, never more than three in number, and quite variably arranged.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1896
