Text-book of comparative anatomy . the sucking 1-5-jointed palps are mostly well developed. The mouth parts of the Khynchota (Fig. 311) together form a proboscis adaptedfor piercing and sucking. The elongated, generally 4-jointed lower lip (posteriormaxillas) forms a channel in which lie the mandibles and interior maxillae, trans-formed into setae covered at their basal part by the upper lip (labrum). VI ANTENNATA—MOUTH PARTH The mechanism for sucking and stinging, which is occasionally very complicated,and to which certain adaptations in the oesophagus (pumps, fish trap ap
Text-book of comparative anatomy . the sucking 1-5-jointed palps are mostly well developed. The mouth parts of the Khynchota (Fig. 311) together form a proboscis adaptedfor piercing and sucking. The elongated, generally 4-jointed lower lip (posteriormaxillas) forms a channel in which lie the mandibles and interior maxillae, trans-formed into setae covered at their basal part by the upper lip (labrum). VI ANTENNATA—MOUTH PARTH The mechanism for sucking and stinging, which is occasionally very complicated,and to which certain adaptations in the oesophagus (pumps, fish trap apparatus,etc.), belong, cannot be here more exactly described. The mouth parts of the other Hexapoda must be referred to one or other of thetypes depicted. The mouth parts of the Coleoptera are for biting and masticating, similar to thoseof the Orthoptera ; the masticatory ridges of the anterior maxilla? are rarely trans-formed into a sucking tube. The mouth parts of the Dermaptcra, Ephemeridcc, Odonata, Plecoptera Corrodent FIG. 311.—Mouth parts of the Hemiptera. A, of Pentatoma. L, of Pyrrhocoris. as before. Lettering Ncuroptera, and Panorpata are also adapted for biting, and belong with variousdeviations to the type of those of the Orthoptera and Coleoptera. The mouth parts of the Thysanoptera (Physopoda) hold a position intermediatebetween the biting mouth parts of the Orthoptera and the sucking mouth parts ofthe lihynchota. The mandibles are changed into piercing setre, and come to liewithin a short tubular proboscis, which arises by the growing together of the upperlip with the anterior maxillse and the lower lip (posterior maxilla2). The 2 pairsof maxillfe have distinct palps and otherwise generally show the typical partsvariously modified. In the Triclioptcra the mandibles are rudimentary, the 2pairs of maxilUe together form a sort of proboscis (for piercing and sucking), the 4palps remaining separate on it. The palps, however, as well as the proboscis itself,ma
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
