352 INSECTA. 



In the tenth or the Lepidoptera, there are six legs, four mem- 

 branous wings, covered with small coloured scales resembling dust; 

 a horny production in the form of an epaulette, and directed back- 

 wards, is inserted before each upper wing, and the jaws are replaced 

 by two united tubular filaments, forming a kind of spirally convo- 

 luted tongue. 



In the eleventh or the Riiipiptera, there are six legs, two. 

 membranous wings folded like a fan, and two crustaceous movable 

 bodies, resembling little elytra, situated at the anterior 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 membra- 

 nous extended wings, accompanied, in most of them, by two movable 

 bodies or halteres, placed behind them; the organs of manducation 

 are a sucker composed of a variable number of setas inclosed in an 

 inarticulated sheath, most frequently in the form of a proboscis ter- 

 minated by two lips. 



ORDER I. 

 MYRIAPODA. 



The Myriapoda commonly called Centipedes^are the only animals 

 of this class which have more than six feet in their perfect state^and 

 whose abdomen is not distinct from, the trunk. Their body, desti- 

 tute of wings, is composed of a (usually) numerous suite of annuli, 

 most commonly equal, each of which, a few of the first excepted, 

 bears two pairs of feet mostly terminated by a single hook; these 

 annuli are either entire or divided into two demi-segments, each 

 bearing a pair of those organs, and one of them only exhibiting two 

 stigmata. 



The Myriapoda in general resemble little Serpents or Nereides, 

 their feet being closely approximated to each other throughout the 

 whole extent of the body. The form of these organs even extends 

 to the parts of the mouth. The mandibles are bi-articulated and 

 immediately followed by a quadrifid piece in the form of a lip with 

 articulated divisions, resembling little feet, which, from its position, 



