Entomology : with special reference to its biological and economic aspects . Mouth parts of a hemipteron, Bcnacus griscus. A, dorsal aspect; B, transverse sec-tion; C, extremity of mandible; D, transverse section of mandibles and maxillae; c,canal; I, labrum; li, labium; m, mandible; mx, maxillse. Lepidoptera.—In Lepidoptera. excepting Erioccpliakt, thelabrum is reduced (Fig. 51) and the mandibles are either rudi-mentary or absent (Rhopalocera ). The two maxilhe are rep-resented by their galeae, which form a conspicuous proboscis;the grooved inner faces of the galeae (or lacinicT, according to
Entomology : with special reference to its biological and economic aspects . Mouth parts of a hemipteron, Bcnacus griscus. A, dorsal aspect; B, transverse sec-tion; C, extremity of mandible; D, transverse section of mandibles and maxillae; c,canal; I, labrum; li, labium; m, mandible; mx, maxillse. Lepidoptera.—In Lepidoptera. excepting Erioccpliakt, thelabrum is reduced (Fig. 51) and the mandibles are either rudi-mentary or absent (Rhopalocera ). The two maxilhe are rep-resented by their galeae, which form a conspicuous proboscis;the grooved inner faces of the galeae (or lacinicT, according toKellogg) form the sucking tube, which opens into the oesoph-agus. The labium is reduced, though the labial palpi () are well developed. The so-called rudimentary mandi-bles of Anosia and other forms have been shown by Kelloggto be lateral projections of the labrum (Fig. 51) and he termsthem pilifers. 42 ENTOMOLOGY Fig. The exceptional structure of the mouth parts in the gene-ralized genus ErioccpJiala (Micropteryx) sheds much hght on the morphology of theseorgans in other Lepidop-tera, as Walter and Kel-logg have shown. Inthis genus there are func-tional mandibles; themaxilla presents palpus,galea, lacinia, stipes andcardo, though there is noproboscis; the labium haswell developed submen-tum, mentum and palpi; a• hypopharvnx is present. Head of a sphingid moth, Phlegcthontius . a, antenna; c, clypeus; e, eye; /, labrum; ->- 116 SUCKUlg apparatus, m. mandible; p, pilifer; pr, proboscis. ^g dcSCribcd bv BurgCSS. is essentially like that of Diptera. Five muscles, originatingat the skull and inserted on the Fig. 52. wall of a pharyngeal bulb, serveto dilate the bulb that it may suckin fluids, while numerous circularmuscles serve by contracting suc-cessively to squeeze the contentsof the bulb back into the stomach;a hypopharyngeal valve prevent?their return forward. Diptera.—In the female
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
