Directions for collecting and preserving insects . ese scales on the wingof the common silk-worm. The transformations ofthese insects are complete,and the changes are usually so sudden and striking as to have excitedthe wonder and admiration of observers from earliest times. The more common form of the larva is exampled in the ordinarycaterpillar—a cylindrical worm with ahead, twelve joints and a sub-joint; six thoracic or true legs, four abdominaland two anal prolegs. But there is agreat variety of these larvae, some hav-ing no legs whatever, some having onlythe jointed legs, and others havin
Directions for collecting and preserving insects . ese scales on the wingof the common silk-worm. The transformations ofthese insects are complete,and the changes are usually so sudden and striking as to have excitedthe wonder and admiration of observers from earliest times. The more common form of the larva is exampled in the ordinarycaterpillar—a cylindrical worm with ahead, twelve joints and a sub-joint; six thoracic or true legs, four abdominaland two anal prolegs. But there is agreat variety of these larvae, some hav-ing no legs whatever, some having onlythe jointed legs, and others having eitherfour, six, eight, or ten, but never morethan ten prolegs. With few exceptionsthey are all vegetable feeders, and withstill fewer exceptions, terrestrial. The perfect insects make tree use oftheir ample wings, but walk little; and their legs are weak, and notmodified in the various ways so noticeable in other orders, while thefront pair in some butterflies are impotent. As an order this must be considered the most injurious of the FIG. 15.—A Spbingid, Ampelophaga myron.
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Keywords: ., bookauthorrileycha, bookcentury1800, bookdecade1890, bookyear1892
