310 INSECTA. 



almost naked and turned up. The chryalis is enclosed in a cocoon 

 of silk. Latreille distinguishes these species by the generic appel- 

 lation of Orxeodks *. 



ORDER XI. 



RHIPIPTERA. 



This order Avas established by M. Kirby under the name of Slrestp- 

 tera (twisted wings), on certain Insects remarkable for their anoma- 

 lous form and irregular habits. 



From the two sides of the anterior extremity of the trunk, near 

 the neck and the exterior base of the two first legs, are inserted two 

 small, crustaceous, moveable bodies, in the form of little elytra, directed 

 backwards, that are narrow, elongated, clavate, curved at the ex- 

 tremity, and terminate at the origin of the wings f . As elytra, 

 properly so call, always cover the whole or the base of the latter 

 organs and arise from the second segment of the trunk, these bodies 

 are not true wing-cases, but parts analogous to those (pterygoda) 

 we have already observed at the base of the wings in Lepidoptera. 

 The wings of the RhipiT:tera are large, menbranous, divided by 

 longitudinal and radiating nervures, and fold longitudinally in the 

 manner of a fan. The mouth consists of four pieces, two of which, 

 the shortest, appear to be so many biarticulated palpi ; the others 

 inserted near the internal base of the preceding ones, resemble little 

 linear laminae, which are pointed and crossed at their extremity like 

 the mandibles of various Insects; they bear a greater similitude to 

 the lancets of the sucker of the Diptera than to true mandibles J. 

 The head is also furnished with two hemispherical, slightly pedi- 

 culated, and granular eyes ; two almost filiform and short antennce, 

 approximated at base on a common elevation, consisting of three joints, 

 the two first of which are very short, and the third very long, and 

 divided down to its origin into two long, compressed, lanceolate 

 hr^.nches, laid one against the other. The ocelli are wanting. The 

 form and divisiuns of the trunk are very similar to those of several 

 Cicadarise Psyllee, and chrysides. The abdomen is almost cylindrical, 

 consists of eight or nine segments, and is terminated by pieces also 



*P. hexadacfijlus, Fab.; the Pterophore en iventail of GeofFroy. See Lat., Gen. 

 Crust, et Insect., IV, p. 234 and 235. 



f The prehalanciers, Lat. 



I According to Savigny, their mouth consists of a labrum, two mandibles two 

 maxillse, each bearing a very small uniarticulated palpus and of a labium without palpi. 



