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 . FIG. 24. — Presumed larva of Nem-optera (Neciojrfiiliiif aren<triux),Pyramids of Egypt. — After Itoux,from THE EPI PHARYNX 43 writers (Kowalevsky, Carriere, and also Chatin) to represent a pair of appendages, but Heymons (LSI),)) refutes this view, stating as his reason that the labrum arises between the two halves of the nervous system (protocere- brum), while all the true appendage
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 . FIG. 24. — Presumed larva of Nem-optera (Neciojrfiiliiif aren<triux),Pyramids of Egypt. — After Itoux,from THE EPI PHARYNX 43 writers (Kowalevsky, Carriere, and also Chatin) to represent a pair of appendages, but Heymons (LSI),)) refutes this view, stating as his reason that the labrum arises between the two halves of the nervous system (protocere- brum), while all the true appendages arise on each side of the nervous system. (See also Fig. 34.) In the fleas (Siphonaptera) both the clypeusand labrum are wanting. While it apparently forms an anteriorspecialized portion of the procephalic lobes,Viallanes regarded it as belonging to thethird, or his tritocerebral, segment, since the nium; ftdyi*; £, abrum; o, o, ocelli; e, eye ; <;, antenna ; labral nerves arise from the tritocerebral ™*. mandible; mas portion of maxilla uncovered by the la- ganolia. But since in all the early as well brum; ®, maxillary palpus ;#, labial palpus. as late stages of embryonic life it appears to be situated in front of the mouth, it would seem to belong to the first segment. In the embryo of Blatta it firs
Size: 1428px × 1749px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
