. 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). 1128 Home Nature-Study Course. THE LARVA Observations by Pupils-' (i). Note whether all the wrigglers are of the same general shape or whether some of them have a very large head; these latter are the pupae and the former are the larvae. We will study the larvae first. Where do they rest when undisturbed? Do they rest head up or down? Is there any p
. 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). 1128 Home Nature-Study Course. THE LARVA Observations by Pupils-' (i). Note whether all the wrigglers are of the same general shape or whether some of them have a very large head; these latter are the pupae and the former are the larvae. We will study the larvae first. Where do they rest when undisturbed? Do they rest head up or down? Is there any part of their body that comes to the surface of the water? (2). When disturbed what do they do? When they swim do they go head or tail first ? When they float do they go upward or downward ? (3). Observe one resting at the top. At what angle does it hold itself to the surface of the water? Observe its head. Can you see the jaw brushes revolving rapidly? WHiat is the purpose of this? De- scribe its eyes. Can you see its antennae ? (4). Note the two peculiar tubes at the end of the body and 3ee if you can make out their use. (5). Note especially the tube that is thrust up to the surface of the water when the creatures are resting. Can you see how the opening of this tube helps to keep the wriggler afloat? What do you think is the purpose of this tube? Does it not become filled. Mosquito larva or wriggler. with water when the wriggler is swimming? Can you see the two air vessels or trachae extending from this tube along the back the whole length of the body? (6). Note the peculiarities of the other tube at the rear end of the body. Do you think the little finger-like projections are an aid in swim- ming? How many are there? (7). Can you see the long hairs along the side of the body? (8). Does the mosquito rest at the bottom of the bottle or aquarium? PUPA (9). What is the most noticeable difiference in appearance between the larva and pupa? (10). When the pupa rests at the surface
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