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 . larva skin. It is now considerablylarger than before. Immediately afterthis tedious operation its body is soft,but the crust soon hardens. This change,with most species, probably occurs earlyin summer. When about to change into the adultfly the pupa climbs up some plant nearthe surface of the water. Again its back yawns wide open, and from the rent our dragon-fly slowlyemerges. For an hour or more it remains torpid and listlr--;.with its flabby,
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 . larva skin. It is now considerablylarger than before. Immediately afterthis tedious operation its body is soft,but the crust soon hardens. This change,with most species, probably occurs earlyin summer. When about to change into the adultfly the pupa climbs up some plant nearthe surface of the water. Again its back yawns wide open, and from the rent our dragon-fly slowlyemerges. For an hour or more it remains torpid and listlr--;.with its flabby, soft wings remaining motionless. The fluidsleave the surface, the crust hardens and dries, rich and variedtints appear, and the dragon-fly rises into its new world oflight and sunshine. In Agrion and its allies (Agrionina) the antenna: are four-jointed, the eyes are small compared with those of Libellula,and distinct; the wings are equal, while the abdomen is cylin-drical and long and slender. In Calopteryx the wings arevery broad and densely reticulated ; the pterostigma is absentin the males, that of the females irregular and areolate ; the. LIBELLULID^E. 603
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
