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 . large, andproject towards what is destined to be the omer edge of thewing, until when the larva is ready to transform into the pupa, 710 APPENDIX. the wings appear as little bags hanging down the sides, justunder the skin. The number of main tracheae in the wingappears from one of Landois figures to be six. Hence, as wehave before suspected, this is probably the typical number ofveins in the Avings of all insects, though usually but five arereadil
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 . large, andproject towards what is destined to be the omer edge of thewing, until when the larva is ready to transform into the pupa, 710 APPENDIX. the wings appear as little bags hanging down the sides, justunder the skin. The number of main tracheae in the wingappears from one of Landois figures to be six. Hence, as wehave before suspected, this is probably the typical number ofveins in the Avings of all insects, though usually but five arereadily made out. A New Fossil Carboniferous Insect. — Mr. S. I. Smithcontributes to the American Journal of Science a descrip-tion of the fore wing of Paolia vetusta from near Paoli, Indi-ana. The wing (Fig. 663) is inches in length and inch wide. The venation is remarkable for the number ofslender branchlets which the veins throw off towards the poste-rior border and the tip of the wing. The great care withwhich the specimen has been drawn and engraA^ed obviates thenecessity of farther description. Mr. Smith remarks that Fig. Wing of Paolia vetusta. this wing differs so much in neuration from any family ofrecent insects, that it is difficult to i)oint out any near affinitywith living forms, although it shows some points of resem-blance to several families of Neuroptera, and especially to theEphemerids. To Hemeristia and 3Iiamia, he adds, it showsmore resemblance, but still differs more from either of thesegenera, which are considered distinct families by Mr. Scudder,than they do from each other. It seems still more allied loDictyoneura libeUuloicles of Goldenberg, Prof. Hagen consider-ing it, with Eugereon Bockingii Dohrn, as a species of thisgenus. In both Dictyoneura and Eugereon, as figured, thewings have considerable resemblance to the specimen fromIndiana, but in neither of them are the nervures so numerously
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects