. 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;. Blowflies. 620 THE SENSES AND SENSORY ORGANS. the semicircular canals and cochlea of a Vertebrate ; and vibra- tions of this fluid would be an efficient cause acting upon the chordotonal elements of the halter. The vibrations of this fluid would necessarily be greatly intensified by the varying pressure on the elastic capitellum of the halter. I think it p
. 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;. Blowflies. 620 THE SENSES AND SENSORY ORGANS. the semicircular canals and cochlea of a Vertebrate ; and vibra- tions of this fluid would be an efficient cause acting upon the chordotonal elements of the halter. The vibrations of this fluid would necessarily be greatly intensified by the varying pressure on the elastic capitellum of the halter. I think it probable that some such action occurs as that which I have indicated. The halteres appear to me to be microphones of a most efficient kind, which probably enable these insects to perceive sounds the intensity of which is far less than those which affect the human ear. 12. THE WING ORGANS. The wings of most Insects contain organs which are similar to the chordotonal organs of the halteres of the Diptera. These were discovered by Braxton Hicks [292], and have been more fully described by Graber [285].. Fie. 81.—The wing organs of Clytus and Chrysopa, after Graber [285]. A> the trachea and nerve of the submarginal nervure of the wing of Clytus, seen as a transparent object ; />, surface view of three of the organs from the same ; C, group of pores on the base of the submarginal nervure of the wing of Chry- sopa ; a, bands uniting the organs with the integument; c/i, chordotonal thread ; ;/, nerve ; /, pore or vesicle ; tr, trachea. After investigating these organs in various insects, Graber obtained a very satisfactory preparation from the subcostal nervure of the wing of Clytus, which he describes in the fol- lowing terms: ' I observed a group of closely-packed and rela- tively small pores on that part of the subcostal nervure which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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