. A manual for the study of insects. Insects. DIPT ERA. 415 larval skin. A few are enclosed in cocoons. When the pupa state is passed within the last larval skin the body of the pupa separates from the larval skin more or less com- pletely; but the larval skin is not broken till the adult fly is ready to emerge. In this case the larval skin, which serves as a cocoon, is termed a pupariuin (pu-paVi-um). In some families the puparium retains the form of the larva ; in others the body of the larva shortens, assuming a more or less barrel-shaped form (Fig. 483, 2), before the change to a pupa take
. A manual for the study of insects. Insects. DIPT ERA. 415 larval skin. A few are enclosed in cocoons. When the pupa state is passed within the last larval skin the body of the pupa separates from the larval skin more or less com- pletely; but the larval skin is not broken till the adult fly is ready to emerge. In this case the larval skin, which serves as a cocoon, is termed a pupariuin (pu-paVi-um). In some families the puparium retains the form of the larva ; in others the body of the larva shortens, assuming a more or less barrel-shaped form (Fig. 483, 2), before the change to a pupa takes place. This is a large order, both in number of species and individuals. The spe- cies differ much in habits. Some are very annoying to man. Familiar examples are the mosquito, which attacks his person ; the ilesh-flies, which infest his food ; the bot-flies and gad- flies that torment his cat- tle ; and the gall-gnats that destroy his crops. Other species are very beneficial. TVinc;/- h^lnno-ino- fo thp Fig. 483.—The Apple-maggot; i. larva; 2, pupa- 1 nose OeiOnging rO tne j-ium; 3, aduU; la, head of larva from side, Syrphidse, and to the sub- family Tachininse of the Muscidae destroy many noxious insects; and very many species, while in the larval state, feed upon decaying animal and vegetable matter, thus acting as scavengers. Although the habits of these creatures, which revel in all kinds of filth, are very disgusting, we cannot help admir- ing that arrangement by which a mass of filth, instead of. showing mouth-parts and cephalic spiracle ; lb, head of larva from below ; ic, caudal spiracle of 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Comstock Pub. Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
