. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Teacher's Leaflet. 1129 (11). Note on the "head" of the pupa two Httle tubes extending up Uke ears. These are the breathing tubes. Note whether these open to the air when the pupa rests at the surface of the water. (12). Can you see the swimming organs at the rear of the body of the pupa? The pupa spends a longer time resting at the surfac
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Teacher's Leaflet. 1129 (11). Note on the "head" of the pupa two Httle tubes extending up Uke ears. These are the breathing tubes. Note whether these open to the air when the pupa rests at the surface of the water. (12). Can you see the swimming organs at the rear of the body of the pupa? The pupa spends a longer time resting at the surface than the larva. How does it act differently from the pupa of other flies and moths and butter- flies? (13). How does the mosquito emerge from the pupa skin? Why does kero- sene oil poured on the surface of the water kill mosquitoes?. Mosquito pupa. Facts for Teachers.— If it were possible to begin this lesson with the little boat- shaped mass of eggs, I should advise it. These egg masses may be found on almost any rain barrel and they look like a lot o tiny cartridges set side by side, point up, and lashed or glued together to make a raft or boat. Like a certain famous soap, they " float," coming up as dry as varnished corks when water is poured upon them. The young mosquito or wriggler breaks through the shell at the lower end of the egg and passes into the water, and it is a most interesting creature to view through a hand lens. The head and the thorax are rather large while the body is tapering and armed with bunches of hairs. At the rear of the body are two tubes very different in shape; one is long, straight and unadorned, and this is the breathing tube through which air passes to the tracheae of the body. This tube has a star-shaped valve at the tip which can be opened and shut. When it is opened at the surface of the water it keeps the little creature afloat and mean- while it lets air into the body. While it is thus hanging there at an angle of 45 degrees
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