Archive image from page 129 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( io8 THE INTEGUMENTAL SKELETON OF THE IMAGO. departure from his assumptions has found a place in recognised text-books on morphology. Balfour [43, vol. i., p. 408], however, says ' the antennas can hardly be considered to have the same morphologica
Archive image from page 129 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( io8 THE INTEGUMENTAL SKELETON OF THE IMAGO. departure from his assumptions has found a place in recognised text-books on morphology. Balfour [43, vol. i., p. 408], however, says ' the antennas can hardly be considered to have the same morphological value as the succeeding appendages; they are, rather, equivalent to the paired processes of the pre-oral lobes of the Chsetopoda.' And Hatchett Jackson [44, p. 497] states that the head in insects exhibits no trace of segmentation, except the appendages of the three first post-oral metameres. Fig. 21.—The I'ostevior surface of the Head Capsule of an immature Dragon-fly (Libvlliila i/t'/iiYssa]: <•, epicranium ; /c, paracephalon ; J, jugum ; mif, mx\ and /«.v', the lateral piers of the mandibular and two maxillary segments ; r, galea of maxilla ; /, laliium ; lb' lateral lobe of labium (galea). The mandibles and lacina; of the maxilla are not represented. So far as I know, no one has as yet attempted to show the limits of the somites which bear the mandibles and maxillaj; even those who apparently recognise the non-segmental character of the anterior part of the head capsule arc silent on the position and relations of the three post-oral ccphahc somites; yet these segments are sufficiently distinct to be easily recognised in the head capsule of immature specimens of Libel- lula depressa and many other insects (Fig. 21). In order to attain a true conception of the nature of the
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