INSECTA, 345 



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

 branous wings folded like a fan, and two crustaceous moveable 

 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 Dipteka, there are six legs, two membranous 

 extended wings, accompanied, in most of them, by two moveable 

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

 are a sucker composed of a variable number of setae, inclosed in an 

 inarticulated sheath, most frequently in the form of a proboscis 

 terminated by two lips. 



ORDER I. 



MYRIAPODAf. 



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, destitute 

 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 J:. 



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, 

 corresponds to the ligula of the Crustacea : next come two pairs of 



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

 the thorax. 



* Formed, as we presume, by pieces analogous to the epaulette or pterygoda 

 of the Lepidoptera. 



t The Mitosata, Fab. 



X The annuli of the body of Insects are usually provided with two stigmata. If 

 those of the Scolopendree, particularly the larger species, those which have twenty- 

 one pairs of feet, be thus considered, it will be found that they are alternately desti- 

 tute of, and provided with, two stigmata, and that thus, compared with these latter 

 animals, they are in fact but semi-annuli. Each complete segment will then have 

 two pairs of feet, one of which is supernumerary, since, in other Insects, the annuli 

 furnished with feet have but two. 



