. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Insect Study 309. Full-grown caterpillar of the lima moth. Photo by M, V. Slingerland. by it. This skin is so firm that it cannot stretch to accommodate the in- creasing size of the grow- ing insect, thus from time to time it is shed. But before this is done, a new skin is formed beneath the old one. After the old skin bursts open and the insect c'rawls forth, the new skin is sufficiently soft and elastic to allow for the increase in the size of the insect. Soon, the new skin becomes
. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Insect Study 309. Full-grown caterpillar of the lima moth. Photo by M, V. Slingerland. by it. This skin is so firm that it cannot stretch to accommodate the in- creasing size of the grow- ing insect, thus from time to time it is shed. But before this is done, a new skin is formed beneath the old one. After the old skin bursts open and the insect c'rawls forth, the new skin is sufficiently soft and elastic to allow for the increase in the size of the insect. Soon, the new skin becomes hardened like the old one, and after a time, is shed. This shedding of the skin is called molting. Some insects shed their skins only four or five times during the period of attaining their growth, while other species may molt twenty times or more. After the larva has attained its full growth, it changes its skin and its form, and becomes a pupa. The pupa stage is ordinarily one of inaction, except that very wonderful changes take place within the body itself. Usually the pupa has no power of moving around, but in many cases it can squirm somewhat, if disturbed. The pupa of the mosquito is active and is an exception to the rule. The pupa is usually an oblong object and seems to be without head, feet or wings; but if it is exanained closely, especially in the case of ^^ butterflies and moths, the " '^ antennae, wings and legs may be seen, folded down beneath the pupa skin. , Many larvae, especially ? '^ those of moths, weave , about themselves a cover- '• ing of silk which serves to protect them from their enemies and the weather, during the helpless pupa period. This silken cover- ing is called a cocoon. The larvae of butterflies do not make a silken cocoon, but the pupa is suspended to some object by a silken knob, and in some cases by a halter of silk, and remains entirely naked. The pupa of a butterfly is called a chrysalis. Care should be taken to have the children u
Size: 1760px × 1419px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcomstockannabotsford1, bookcentury1900, bookdecade1910
