iG2 



INSECTA. 



3t]]o\v, spotted ;vitli lilack, and which Sliaw and Denon have fi|jnred in the accounts of their voyages in Africa; 

 they then reduce them to powder, wliich they use as ilour, as 1 learn fioni M. Savitrny. 'j'liese two species, ami 

 some others, have a conical prominence upon the prosternum, and compose the genus Acjydium. Amongst 

 those which do not present tliis character, and in which the antennae are equally filiform, some have tlie 

 winp-covers and ■winy:s perfect in the two sexes, and belon^; to the g^enus which I have named CEdipocla. In this 

 nunihcr are G. stridulus^ G. ricrxlcscens, [G.Jlavipcs, and a p:reat number of smaller species found in this country, 

 usually called Grasshopiiers, but distinf^uislied by their shorter anteiin;e,] 



Other Acrydia, similarly win2;ed and ^vith fdiform antenntC, hnv'e tlje upper part 



'^ of the prothorax strongly elevated, very compressed, forming a sharp crest, rounded 



ami prolonged into a point behind. Foreign countries possess numerous species, 



one only of which, and of smaller size, is found in the soutli of France (,-i. aiina- 



^i^^:^.j^~ 'I ^^ turn, Fischer.] 



^^sfi^T^^ n -"v III the others, one of the sexes, at least, has the wing-covers and wingsvery short, 



and in no wise fitted for tlight. I have formed for these a new generic group, named 



tic 93.— G. flin'i|,rs. „ ,. ° b o F> 



Po'limia. 



The Acrydia which have the antenna thickened at the tips, either in both sexes or in only one of them, are 

 formed also into a peculiar genus, Gomphocerm^ by Thunberg. G. ailiricus, and other small British species. 



In the second division of the genus Acrydium, the prosternum receives in a cavity a part of the under-side of 

 the head ; the tonguelet is quadritid, and the tarsi have no pulvillus between the ungues ; the antennae have only 

 13 or 14 joints ; the thorax is prolonged behind like a large scntellum, which is sometimes longer than the entire 

 body, and the wing-covers are very small. These Orthoptera form the genus 



Teti-ix, Latr. (Aciyditim, Fab., part of GruUns bulla, Linn.), which is composed of very small species. 



THE SEVENTH ORDER OF IXSECTS,- 



THE HEMIPTERA (Rhyngot.v, Fabr.),— 



Terminate in our system the numerous ilivision of insects furnislied with mng-covers, and 

 l)eing; the only ones nmong them which have neither mandihles nor maxiUa;, properly so 

 called, [that is, fitted for hiting]. A tuhular articidated tongue, cylindrical or conical in its 

 form, curved downwards, or directed under the breast, having the appearance of a kind of 

 rostrum; presenting throughout its whole upper face, when stretched forward, a gutter, or 

 canal, out of which three scaly, stiff, slender, and pointed sette may be withdrawn, and which 

 arc cdvered at the base by a tonguelet; these setas form unitedly a sucker, resembling a sting, 

 having for its sheath the tubular piece above described, and in which it is kept by means of 

 the superior touguelrt [or labrum], situated at its base. The inferior seta is composed of tno 

 threads united into one at a short distance from their origin ; thus the number of the p'eccs 

 of tlic .sucker is, in reality, four. M. Savigny considered that the two superior seta-, or those 

 which are separate, represent the mandibles of the biting insects, and that the two tin cads of 

 the inferior seta answer to the maxillfc (or rather, as it a])pcars to me, to their terminal lobes, 



which in the Bees and Butterilies are transformed 

 an elongated filament) ; hence the lower lip 

 ' vt d '^ replaced by the tubidar sheath of the sucker, and 

 ' _^ the triangular piece at the base becomes the labrum. 

 The tonguelet, jiroperly so called, also exists, and 

 under a form analogous to that of the preceding 

 l>iccc, but bifid at the tip (see Cicada) ; the palpi 

 are the only organs which have entirely disappeared, 

 and vestiges of them are perceived in Thrips, [which, 

 however, arc now jnoved to belong to an order dis- 

 tinct from the ])resent ; palpi, small and inarticulate, 

 also exist in simie of the Hydrocorisa?]. 



The mouth of the Hemiptera is, therefore, fitted 

 only for extracting by suction Huid matters : the 

 delicate tlu'cads of which the sucker is formed pierce the vessels of plants and animals, and the 



". .)CL-lli i a, fc 

 lip, or canal ; i 



of Ilemiplcra. Peiitatnma. {r, even ; 

 f anti-niiie ; M, upper lip; ^ 'J, nndor- 

 .iidiljular, and tnj-, iiiaxinary seta;. J 



