Mr. R. H. Lewis's nciv Britisli Ilomopterous Genera. -1/ 



XL Descriptions of some new Genera of British Homo- 

 ptera. By R. H. Lewis, Esq., 3I.E.S. 



[Read Februaiy 3, 1834.] 



Idiocerus*. Plate VII. %. 2. 



Caput thorace latius ; vertex perhrevis arcuatus medio brevlssimus. 

 Fades subturbinata. Oculi magni. Ocelli 2 in facie, inter 

 oculos dispositi. Antennce triarticulatce, in facie inter oculorum 

 marginem inferiorem inserts ; articulus primus brevissimus, se- 

 cundus cyUndricus, ultimus sctformis, in mare apicem versus in 

 clavam subovatam compressam dilatalus. Prothorax trans- 

 versus, subovatus, postice excisus. Scutellum magnum, trigonum. 

 Alee superiores corpore multo longiores, apice sese involventes. 

 Tibite postic(e valde spinosce et ciliatcE. 



Head broader than the thorax ; the vertex very short, with the 

 anterior margin slightly convex, the posterior very concave. 

 Face subturbinate. Eyes very large. Ocelli 2, placed in the 

 face between the eyes, to which they are a little closer than to 

 each other. (Fig. 2, a.) Antennes inserted in slight depres- 

 sions or excavations between the inferior margin of the eyes ; 

 the first joint very short, the second short, cylindric, the last 

 long, setiform, with two lateral bristles near the base ; in the 

 male, towards the apex, dilated into a nearly oval, much com- 

 pressed club, with the apex very slender. (Fig. 2, 5.)t Rostrum 

 about as long as the prothorax. Prothorax transverse, ovate, 

 posteriorly excised. Scutellum large, trigonate. Superior 

 wings much longer than the abdomen, of a membranaceous 

 texture ; their extremities dilated internally, and one covering 

 the other ; the ner^'ures completed, without extending far into 

 the internal dilated portion, leaving there a margin of pure 

 membrane. (Fig. 2, c.) Ovipositor short, slightly curved up- 

 wards. (Fig. 2, d.) Anterior and intermediate tibia very short; 

 the anterior internally, densely, and finely ciliated ; the inter- 

 mediate internally, with a few fine cilise. Posterior tibia; long, 

 slightly curved, somewhat prismatical ; externally, with the 



* ihos peculiaris, xs^as cornu. 



f I have stated the antennae to be three-jointed ; I think it not improbable, how- 

 ever, that the base of the seta, which bears the lateral bristles, may be a distinct 

 joint. 



