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 . er firmlysupported by the broad prothoracic segment in Orthoptera, manybeetles, etc., into which it is more or less retracted, or it is free andattached by a slender neck, easily turning on the trunk, as in dragon-flies, flies, etc. In some insects there are several chitinous plates,situated on an island in the membrane on the under side of the neck;these are the cervical sclerites of Sharp, oc
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 . er firmlysupported by the broad prothoracic segment in Orthoptera, manybeetles, etc., into which it is more or less retracted, or it is free andattached by a slender neck, easily turning on the trunk, as in dragon-flies, flies, etc. In some insects there are several chitinous plates,situated on an island in the membrane on the under side of the neck;these are the cervical sclerites of Sharp, occurring in Hymen-optera, in many Coleoptera, and in Blattidae. The basal or gular region of the head. — At the hinder part of thehead is the opening (occipital foramen) into the trunk. The cheek(gena) is the side of the head, and to its inner wall is attached themandibular muscle; it thus forms the region behind the eye andover the base of the mandibles. In the Termitidse, where the headis broad and flat, it forms a distinct piece on the under side of thehead bounding the gulo-mental region (Fig. 28). In the Neuroptera(Corydalus, Fig. 29, and Mantispa, Fig. 30) it is less definitely Fio. 29. — Head of Corydalusc-ornntux, J : A, from above. B, from beneath. (. from the I-/!/, clypeus anterior; j>. c/y, clypeus posterior; llir, labrum ; iml. iiiiiinlible ; nur, base of firstmaxilla ; m/i, its palpus ; m, mentum ; s/n, submentum ; plpr, palpifer ; lig, fused second maxilla;ant, antenna; occ, occiput. 48 TEXT-BOOK OF ENTOMOLOGY All the gulo-mental region of the head appears to represent thebase of the second maxillae, and the question hence arises whether the submentum is not the homologueof the cardines of the first maxillaefused, and the»mentum that of thestipites of the latter also fused to-gether. If this should prove to bethe case, the homologies between thetwo pairs of maxillae will be stillcloser than before supposed. Wherethe gula is differentiat
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
