Archive image from page 61 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; CUbiodiversity4765349-9875 Year: 1890 ( 396 THE ALIMENTARY CANAL OF THE IMAGO. Kraepelin [70], and these authors have all correctly ascribed the exsertion of the organ to the inflation of the tracheal air- sacs, although the manner in which this is effected has hitherto remained unexplai
Archive image from page 61 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; CUbiodiversity4765349-9875 Year: 1890 ( 396 THE ALIMENTARY CANAL OF THE IMAGO. Kraepelin [70], and these authors have all correctly ascribed the exsertion of the organ to the inflation of the tracheal air- sacs, although the manner in which this is effected has hitherto remained unexplained. The Air-Sacs of the Proboscis (Fig. 51) are very capacious; they commence as a pair of membranous vessels from the great cervical tracheae {a) and descend in front of the jugum (/), beneath the tentorium. Each trunk has a slender rod of chitin {h) in its anterior wall, which closes the tube by pressing against the jugum. This forms a valve capable of being opened by a small bundle of muscle-fibres (ih), which arise from the front edge of the gena; their contraction opens the Flc. 51.—The Air-Sacs of the Proboscis, a, inferior cervical air-sac ; b, valve in the anterior wall ; r f, anterior, and del, posterior airsac of the rostrum ; J, air-sac of the haustellum ; £•, azygos air-sac of the labella?; //, tracheal vessels of the oral disc ; /, the jugum ; /«, muscle controlling the valve b ; tr, rete mirabile of the tentorium. valve and permits of the passage of air from the thoracic cavity into the tracheae of the proboscis. Immediately in front of this valve the tracheal trunk dilates and gives off numerous vessels (<r tr) of small calibre, which are cylindrical and exceedingly tortuous; they form a rete mirabile in the tentorium, and probably communicate with the large trachea; above that membrane. The main trunk then divides into two branches : an anterior air-sac (c c) which lies on the outer side of the fulcrum, and a posterior sac (c/ d) which descends behi
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