. Nature-study; a manual for teachers and students. Nature study. 212 NATURE-STUDY head down, with the breathing tube thrust up through the surface-film and adhering to it. If they are suddenly dis- turbed, they quickly fall to the bottom. The larva changes to a bent form, the pupa, which breathes air by means of thoracic spiracles. It now has wing pads. This pupa finally splits open on the back, and the winged mosquito appears, using the old pupal case as a raft until its wings are strong enough to fly. All these changes. Fig. 71. Mosquito. take place in a few days, if the conditions are favo
. Nature-study; a manual for teachers and students. Nature study. 212 NATURE-STUDY head down, with the breathing tube thrust up through the surface-film and adhering to it. If they are suddenly dis- turbed, they quickly fall to the bottom. The larva changes to a bent form, the pupa, which breathes air by means of thoracic spiracles. It now has wing pads. This pupa finally splits open on the back, and the winged mosquito appears, using the old pupal case as a raft until its wings are strong enough to fly. All these changes. Fig. 71. Mosquito. take place in a few days, if the conditions are favorable, and they are interesting to observe in the school-room. Keep a number of larvae in a dish of water with a screen over it. Watch frequently, and probably you will see the mosquito emerge. The male mosquito differs in appearance from the female. He has long feathery antennae, believed to be organs of hear- ing, and he has no sting or, rather, beak. Therefore he does not " bite " as does the female. She has smaller antennae, and her mouth-parts are a collection of slender, sharp, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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