Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . are wanting, while the alimen-tary canal is simply a blindsac, remaining in an unorgan-ized state. The second larval state(Fig. G>4, ;, oesophagus; -,^/,supraoesophageal ganglion;H. nervous cord ; <j«, and ^/,genital organs ; ///.s, bauds ofmuscles) is attained by meansof a moult, as usual in themetamorphoses of insects. <ja~The cells of the inner layer of the skin ( hvrMxlpr- Second lur\.i of Platygaster. i MS) now multiply greatly, and
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . are wanting, while the alimen-tary canal is simply a blindsac, remaining in an unorgan-ized state. The second larval state(Fig. G>4, ;, oesophagus; -,^/,supraoesophageal ganglion;H. nervous cord ; <j«, and ^/,genital organs ; ///.s, bauds ofmuscles) is attained by meansof a moult, as usual in themetamorphoses of insects. <ja~The cells of the inner layer of the skin ( hvrMxlpr- Second lur\.i of Platygaster. i MS) now multiply greatly, and give rise at what corresponds to the primitive band ofthe embryos of other insects. The form is of the usual shape of ich-neumon larva. In Pohjncnia the larva in its first stageis very small and motionless, and withscarcely a trace of organization, being amere flask-shaped sac of cells. After fiveor six days it passes into a worm-like stageand subsequently into a third stage ()5, tij. three pairs of abdominal tuberclesdestined to form the ovipositor ; ?, rudimentsof the legs ; /A1, portion of the fatty body ;at, rud
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
