. Principles of economic zoo?logy. Zoology, Economic. 120 BRANCH ARTHROPODA muscular system varies widely in the different forms. In the caterpillars there is a " simple worm-like arrangement of segmentally disposed longitudinal and ring muscles," while in the more active forms, as flics and bees, the muscular system is complicated. The muscles are composed of fine, cross-striated fibers, forming masses of various sizes, and are attached to the rough inner surface of the exoskelton. The muscles are trans- parent and have great contractile power. Digestive System.—The alimentary tube
. Principles of economic zoo?logy. Zoology, Economic. 120 BRANCH ARTHROPODA muscular system varies widely in the different forms. In the caterpillars there is a " simple worm-like arrangement of segmentally disposed longitudinal and ring muscles," while in the more active forms, as flics and bees, the muscular system is complicated. The muscles are composed of fine, cross-striated fibers, forming masses of various sizes, and are attached to the rough inner surface of the exoskelton. The muscles are trans- parent and have great contractile power. Digestive System.—The alimentary tube (Fig. 93), which may be coiled much or little, varies greatly. It is about the length •rectalgjajieL. Fig. —Internal anatomy of Calopte'nus fe'mur-ru'hrum: at, Antenna and nerve leading to it from the " brain " or supra-esophageal ganglion (sp); oc, ocelli, anterior and vertical ones, with ocellar nerves leading to them from the " brain "; ce, esophagus; m, mouth; lb, labium or under lip; if, intra-esophageal ganglion, sending three pairs of nerves to the man- dibles, maxilla;, and labium respectively (not clearly shown in the engrav- ing); sm, sympathetic or vagus nerve, starting from a ganglion resting above the esophagus, and connecting with another ganglion {sg) near the hinder end of the crop; sal, salivary glands (the termination of the salivary duct not clearly shown by the engraver); nv, nervous cord and ganglia; ov, ovary; ur, urinary tubes (cut off, leaving the stumps); ovt, oviduct; sb, sebaceous gland; be, bursa copulatrix; or/', site of opening of the oviduct (the left oviduct cut away); 1-10, abdominal segments. AH other organs labeled in full. (Drawn from his original dissections by Mr. Edward Burgess.) (From Packard's "Zoology," Henry Holt it Co., Publishers.) of the body in carnivorous forms, and longer in the herbivorous insects. It consists of a mouth, esophagus, crop, gizzard (the chitinous lining of which is toothed f
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