. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE FLY 85. Fig. 90.â Cecidomyia, the Hessian- fly, a, larva ; b, pupa. From the " Standard Natural ; The eggs are laid in a boat-shaped mass, which floats on the surface of the water. The larvae escape from the lower ends of the egg-cases, and are known as " ; The larvae of some species rest vertically near the surface of the water, head downward, with the tail end of the body at the surface of the water, since respiration takes place at that end (Fig. 91, A, c); other
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE FLY 85. Fig. 90.â Cecidomyia, the Hessian- fly, a, larva ; b, pupa. From the " Standard Natural ; The eggs are laid in a boat-shaped mass, which floats on the surface of the water. The larvae escape from the lower ends of the egg-cases, and are known as " ; The larvae of some species rest vertically near the surface of the water, head downward, with the tail end of the body at the surface of the water, since respiration takes place at that end (Fig. 91, A, c); other species he horizontal at the sur- face of the water. Upon emerg- ing from the water, the mosquito floats in its pupal skin until its legs and wings harden. Since a disturbance in the water at this time would jeopardize the life of the mosquito, this insect always breeds in quiet waters (Fig. 92). From the habits of the larvae it follows that they can be easily lolled while in the pond by pour- ing kerosene oil on the Fig. 91.â Culex, the mosquito. ^, larva: . r ,i ⢠r ri .. â t i u D J *i, water, tor this forms a nlm c, ]ts respiratory tube. B, pupa ; a, the ' respiratory tubes; a, the end of the on the Surface and prevents abdomen with the two oar-like swim- . . ming appendages, dorsal %dew. After respiration. MinnOWS \^all drawing of E. Burgess. free a pond from larva; if the edges of the pond are kept free from grass so as to allow the fish to get to them. Mosquitoes are not merelj^ a nuisance, but are disseminators of some of the most dangerous of human diseases. Malaria. 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
