The Anatomy of the Mouth-Parts And of the Sucking Apparatus of Some Diptera
The Anatomy of the Mouth-Parts And of the Sucking Apparatus of Some Diptera
George Dimmock
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The labium has for function, for the most part, the protection of the fine setae which form the true piercing organ of Cidej^. In the females of Ctdesr proper, the protective sheath is formed by the labium alone. When the mosquito has found a place which suits its taste for piercing — - for it often tries different places on our skin with its labellae, probing right and left, before finding a place where it decides to remain — it plants its labellae firmly upon the spot, and a moment later the ...labium is seen to be flexing backward in its middle, the setae, firmly grouped together, remain straight and enter the skin, while the two labellae guide them, much as a carpenter guides his bit with his fingers, while boring a piece of plank. When the setae of Culex have entered the skin to nearly their fuU length the labium is bent double beneath the body of the insect, the labellae stiU holding the base of the setae at the point where they enter the skin. When the mosquito wishes to withdraw the setae it probably first with- draws the two barbed maxillae beyond the other setae, that is, so that their barbs, or papillae, will be kept out of action by the mandibles and hypopharynx; then it readily withdraws the setae, perhaps aiding their withdrawal by the Digitized by Google — 19 — muscles of the labium, for, during the process of extracting the setae from the skin, while they are slowly sinking back into the groove upon the upper side of the straightening labium, the mosquito keeps the labellae pressed firmly upon the skin.
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