Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . tomach; h, intestine; i, urinary tuues; fc, rectum.—From Judeicuand Nitsche. nected by two cords (commissures), the two cords in certainparts of the body in some insects united into one. Thereare in the locust ten ganglia, two in the head, three in thethorax, and five in the abdomen. The first ganglion israther larger than the others, and is called the brain rests upon the oesophagus, whence its name,supra-cesophageal ganglion. From the brain arise the large,short, optic nerves (Fig. 8, op),
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . tomach; h, intestine; i, urinary tuues; fc, rectum.—From Judeicuand Nitsche. nected by two cords (commissures), the two cords in certainparts of the body in some insects united into one. Thereare in the locust ten ganglia, two in the head, three in thethorax, and five in the abdomen. The first ganglion israther larger than the others, and is called the brain rests upon the oesophagus, whence its name,supra-cesophageal ganglion. From the brain arise the large,short, optic nerves (Fig. 8, op), which go to the compoundeyes, and from the front arise the three slender filamentswhich are sent to the three ocelli (Fig. 8, oc). From im-mediately in front, low down, arise the antennal nerves(Fig. 4, at). The infra-cesophageal ganglion (Fig. 8, if), as its nameimplies, lies under the cesophagus at the base of the head, 14 ENTOMOLOGY. under a bridge of cliitine (the tentorium) and directly be-hind the tongue. It is connected with the supra-oasophageal jj c aj 3-^j= gC * • n> IIP. THE STRUCTURE OF INSECTS. 15 ganglion by two commissures passing up eacli side of theoesophagus. From the under side of the infra-oosophageal AG1-*
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
