Memoirs of the National Academy of Sciences . oss veins were wanting, and thatdifferent longitudinal veins, which afterwards more or less completely disap-peared, were present, and hence be regarded the pupal venation as the primi-tive one. This view Spuler has adoptedand extended, and it plainly enough,sni>ported by the researches of Brauer and Eedtenbacher onthe venation of the nymidi of Odonata, solves the problem of the venation of insects in generaland especially for Neuroptera, Tri-choptera, Mecoptera (ranorpida-),Lepidoptera, and Diptera. Spulcrs mcthfid was to strip offthe loose ski
Memoirs of the National Academy of Sciences . oss veins were wanting, and thatdifferent longitudinal veins, which afterwards more or less completely disap-peared, were present, and hence be regarded the pupal venation as the primi-tive one. This view Spuler has adoptedand extended, and it plainly enough,sni>ported by the researches of Brauer and Eedtenbacher onthe venation of the nymidi of Odonata, solves the problem of the venation of insects in generaland especially for Neuroptera, Tri-choptera, Mecoptera (ranorpida-),Lepidoptera, and Diptera. Spulcrs mcthfid was to strip offthe loose skin of a caterpillar just beginning to pupate, and examine theincipient venation of the wings of tlie young pupa on the living insect. Heplaced the living pupa in water and then, since the process of thickeningand resulting concealment of the veins of the wing is retarded, the tra-cheal branches become slightly enlarged, filled with air, and thus are moreeasily seen. Hence Fig. 48—Venatiou ofseraipupa of Cerura vi,mtla.—After Spuler. trjO^.
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