244 INSECT A. 



In the eighth or the Neuroptera, there are six legs, 

 four membranous and naked wings, and mandibles and jaws 

 for mastication ; the wings are finely reticulated, and the in- 

 ferior are usually as large as the superior;, or more extended 

 in one of their diameters. 



In the ninth or the Hymexoptera, there are six feet, and 

 four membranous and naked wings, and mandibles and jaws 

 for mastication : the inferior wings are smaller than the others, 

 and the abdomen of the female is almost always terminated by 

 a terebra or sting. 



In the tenth or the Lepidoptera, there are six legs, 

 four membranous wings, covered with small coloured scales 

 resembling dust; a horny production in the form of an epau- 

 lette, and directed backwards, is inserted before each upper 

 wing, and the jaws are replaced by two united tubular fila- 

 ments, forming a kind of spirally convoluted tongue(l). 



In the eleventh or the Rhipiptera, there are six legs, two 

 membranous wings folded like a fan, and two crustaceous mo- 

 vable bodies, resembling little elytra(2), situated at the ante- 

 rior extremity of the thorax ; the organs of manducation are 

 simple, setaceous jaws, with two palpi. 



In the twelfth or the Diptera, there are six legs, two mem- 

 branous extended wings, accompanied, in most of them, by 

 two movable bodies or halteres, placed behind them ; the or- 

 gans of manducation are a sucker composed of a variable num- 

 ber of setae, inclosed in an inarticulated sheath, most fre- 

 quently in the form of a proboscis terminated by two lips. 



(1) Spiritrompe. See our general observations on the class. The thorax of the 

 Lepidoptera has more analogy with that of the Neuroptera, than with that of the 

 Hymenoptera, the segment which I have called the mediate appearing to form 

 part of the abdomen, while in the latter and in the Diptera it is incorporated with 

 the thorax. 



(2) Formed, as we presume, by pieces analogous to the epaulette or pterygoda 

 of the Lepidoptera. 



