. A manual for the study of insects. Insects. CHAPTER IV. Order Thysanura (Thys-a-nu'ra). Bristle-tails, Spring-tails, Fish-moths^ and others. The members of this order are wingless insects which undergo no metamorphosis, the larval form being retained by the adult. The mandibles and maxillcs are retracted within the cavity of the head, so that 07tly their tips are visible ; they have, however, some freedom of motion, and can be used for biting and chezving soft substances. True compound eyes are rarely present; but in some genera there is a group of shnple eyes on each side of the head. The a
. A manual for the study of insects. Insects. CHAPTER IV. Order Thysanura (Thys-a-nu'ra). Bristle-tails, Spring-tails, Fish-moths^ and others. The members of this order are wingless insects which undergo no metamorphosis, the larval form being retained by the adult. The mandibles and maxillcs are retracted within the cavity of the head, so that 07tly their tips are visible ; they have, however, some freedom of motion, and can be used for biting and chezving soft substances. True compound eyes are rarely present; but in some genera there is a group of shnple eyes on each side of the head. The abdomen is sometimes furnished with rudimentary legs. Under stones and decayed leaves and wood, in the chinks of bark, among moss, in damp places, on snow or on pools, or sometimes in houses, are the members of this order to be found. They are for the most part very small insects, but sometimes they are nu- merous and lively enough to make up for their lack in size. They have no wings, but they can either run very "^'^•J^^Tii^'X-^'b^^ ^^^t ^^ i^^P ^^'y ^^'' Their ?o"'mUSyeTx?:mi^^^^^^^ mouth-parts are usually fit- labial palpus. ^^j f^j. biting, but are very difficult to study, because they are reti-acted within the 82. 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
