XV1U EXPLANATION OF TERMS, ETC. 



Hypoderma. (p. 16) The membranous lining of the Elytra. 



Epipleura. Side-cover, (p. 21,27) The inflexed margin of many Elytra, covering the sides of the Alitrunk and 

 Abdomen. 



Tegmina. (p. 250) Organs of a less firm consistence peculiar to Orthoptera. 



Hemelytra. (p. 275) Organs peculiar to the Hemiptera, consisting of two portions, a hard or leathery base called the 

 Corium, and a terminal Membrane, (p. 275. J 



Al^e. Wings. Membranous organs of flight common to the remaining Orders. 



Tegul/e. Base-covers, (p. 256, 264) Concavo-convex pieces that defend the base of the ivings in Hymenoptera. 



Medipectus. Mid-breast, (p. 135, 165) The under side of the Mid-trunk, bearing the intermediate pair of legs. 



Peristethium. The anterior part of the Mid-breast. 



Scapularia. The Scapulars, (p. 75) The lateral pieces outside the mid-legs. 



Mesosternum. Mid-breastbone. The middle piece, between the above legs. 



Potruncus. After-trunk. The last segment of the Trunk, bearing the under wings and posterior pair of legs. 



Metathorax. The After-tkorax. (p. 259) The upper side of the After-trunk, which bears the above wings, and termi- 

 nates posteriorly in the Postscutellum. (p. 266.) 



Postpectus. The After-breast. (94, 165, &c.) The under side of the Potrunk. 



Mesostethium. (p. 75) Anterior part of the above, situate between the intermediate and posterior legs. 



Parapleur^e. (p. 77) Two pieces, one on each side the postpectus, outside the posterior legs. 



Metasternum. The After-breastbone. A central and often elevated part between these legs. 



TERMS RELATING TO THE ABDOMEN. 



Hypopygium. (p. 130, 155) The last ventral segment of the Abdomen, with the Podex, or last dorsal segment, forming the 



Anus, 

 Ovipositor. Egg-placer, (p. 257) The instrument with which the Orthoptera, and many Hymenoptera, convey their eggs 



to their proper station. * 



Caudul^e. (p. 253) Two or more jointed, flexile, anal organs. 



