Entomology : with special reference to its biological and economic aspects . Skull of a grasshopper, Melanoplus differentialis. a, antenna; c, clypeus; e, com-pound eye; f, front; g, gena; /, labrum; Ip, labial palpus; in, mandible; mp, maxillarypalpus; 0, ocelli; oc, occiput; pg, post-gena; v, vertex. which bears the compound eyes; it is usually a single piece,or sclerite, though in some of the simpler insects it is dividedby a Y-shaped suture. The middle of the face, where themedian ocellus often occurs, is termed the froni; ordinarilythis is simply a region, though a frontal sclerite exists
Entomology : with special reference to its biological and economic aspects . Skull of a grasshopper, Melanoplus differentialis. a, antenna; c, clypeus; e, com-pound eye; f, front; g, gena; /, labrum; Ip, labial palpus; in, mandible; mp, maxillarypalpus; 0, ocelli; oc, occiput; pg, post-gena; v, vertex. which bears the compound eyes; it is usually a single piece,or sclerite, though in some of the simpler insects it is dividedby a Y-shaped suture. The middle of the face, where themedian ocellus often occurs, is termed the froni; ordinarilythis is simply a region, though a frontal sclerite exists insome insects. Just above the front, and forming the sum- 30 ENTOMOLOGY mit of the head, is the region known* as the vertex; itoften bears ocehi. The clypeus is easily recognized as beingthe sclerite to which the upper hp, or labniin, is hinged,though the clypeus is not invariably delimited as a distinctsclerite. The cheeks of an insect are known as the gcnce,and post-gencc sometimes occur. On the under side of thehead is the gula, which bears the under lip, or labiiiii
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
