. A manual of zoology. Zoology. IV. INSECTA: HEXAPODA, ARCHIPTERA 419 inal somite; two or three additional pairs appear in other genera. The cerci or large 'bristles' are also regarded as abdominal appendages. Sub Order I. THYSANURA (Bristle-tails). Body elongate, with long bristles (cerci) at the hinder end. Lepisma saccharina* silver fish, common among old books and papers, does considerable damage. Campodea* (fig. 365). iHachilis/" lapyx* with caudal forceps. Sub Order II. COLLEMBOLA (Spring-tails). Compressed forms in which two jointed appendages bent under the body serve as a spring,
. A manual of zoology. Zoology. IV. INSECTA: HEXAPODA, ARCHIPTERA 419 inal somite; two or three additional pairs appear in other genera. The cerci or large 'bristles' are also regarded as abdominal appendages. Sub Order I. THYSANURA (Bristle-tails). Body elongate, with long bristles (cerci) at the hinder end. Lepisma saccharina* silver fish, common among old books and papers, does considerable damage. Campodea* (fig. 365). iHachilis/" lapyx* with caudal forceps. Sub Order II. COLLEMBOLA (Spring-tails). Compressed forms in which two jointed appendages bent under the body serve as a spring, throwing the animals (one to three mm. long) for- wards. Podiira*; Amirida maritima* in tide y>oo\s; Achoreuics nivalis * sno^f flea. The recently discovered group of PROTUR.\ mav be mentioned here. They lack antenna;, have the first leg directed forwards and tactile, twelve abdominal somites, appendages on first three, two thoracic spiracles. Europe and India. AcercnioDion. Order II. Archiptera (Pseudoneuroptera). These represent the primitive forms of winged insects. The elongate body usually bears the cerci of the Thysanura. The wings are delicate and trans- parent, supported by a close network of nervures, both pairs being very closely alike. The mouth parts are of the typical biting kind, the labium frequently deeply cleft. These points of primitive structure are correlated with a primi- tive, usually hemimetabolous development. The distinction between larva and imago is largely one of presence or absence of wings, although larval organs like gills (.\mphibiotica) may occur. Frequently the development is direct when the adults, as in some Termites and the Psocida;, are Fig. -Termesflavipes/' white ant (from Riley), a, larva; A, winged male; c, worker; d, soldier; f, queen; f. pupa. Sub Order I. CORRODENTIA. Larv£e distinguished from the imagines by difference in size and, in the winged forms, by lack of wings. Best known are the TERMiTiDyE (Isoptera),
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
