A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . membranous, partly hollow expansion of the base of the labium. It may be exposed by depressing the end of the labium, when the opening of the salivary duct may be seen at the bottom or end of the space or gap between the hinder base of the tongue, and the inner anterior base of the labium, as shown by the arrows in Fig. 70. It is somewhat pyriform, slightly keeled above, and bearing fine stiff
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . membranous, partly hollow expansion of the base of the labium. It may be exposed by depressing the end of the labium, when the opening of the salivary duct may be seen at the bottom or end of the space or gap between the hinder base of the tongue, and the inner anterior base of the labium, as shown by the arrows in Fig. 70. It is somewhat pyriform, slightly keeled above, and bearing fine stiff bristles, which, as they point more or less inwards, probably aid in retaining the food within the mouth. The 1 Uzel states that what is regarderl as the ligula of Campodea is formed from thestrniite of the first maxillary segment ; while t ho two parts regarded as paraglossajgrow out from the. slcrnite of the mandihular segment, and these three structurestogether he regards as the hypopharynx. (/ool. Auzeiger, July 5, 1897, p. 234.) THE H YPOPPIA R YNX 73. nit FIG. 71. — Section through theanterior part of the head of Ana-brus (the mandibles removed),showing the relations of the hypo-pharynx (hi/I*} to the opening- of base of the tongue is narrow, and extends back to near the pharynx,there being on the floor of the mouth, behind the tongue, two oblique,slight ridges, covered with stiff, golden-yellow hairs, like those onthe tongue. The opening of the salivary duct is situated on theunder or hinder side of the hypopharynx,between it and the base of the labium, thebase of the former being cleft; the hollowthus formed is situated over the opening,and forms the salivary receptacle. In the Locustidae (Anabrus, Fig. 71) thetongue (hypopharynx) is a broad, some-what flattened lobe arising from the upperpart of the base of the mentum and behindthe palpifer. This lobe is cavernous un-derneath, the hollow being the salivaryreceptacle (sr); the latter is situated overthe opening
Size: 1514px × 1651px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
