108 MANDIBULATA. — COLEOPTERA. 



Genus CCCXVI. — Tanysphykus, Germm-. 



Antennce geniculated, 12-jointed, moderatej slightly attenuated, the scape nearly 

 touching the eyes; the funiculus 7-jointed, its basal joint thick, short ; second 

 obconic; four following minute, transverse, coarctate; club large, subglobose, 

 with the articulations closely united. Rostrum elongated, stout, round, 

 curved, the apex slightly depressed : eyes oblong, depressed : thorax convex, 

 ■with the sides a little rounded :• elytra oblong-ovate, attenuated at the apex, 

 which is deflexed, the shoulders somewhat rectangular: legs elongate, stout, 

 anterior approximating at the base: tibioe rounded, the apex furnished within 

 with a stout acute tooth. 



This very minute genus differs from Hylobius by having the 

 second joint of its antennae short and thickened, as well as by its 

 general structure and habit : — the only known species is found on 

 the leaves of the common duckweed. 



Sp. 1. Lemnje. Nigro-piceus, antennis pedibusque rufo-piceis, elytris ovatis, 



profunde punctato-striatis, cinereo-nebulosis. (Long. corp. ^ — \^ lin.) 

 Rh. Lemnse. Fahricius. — Ta. Lemnse. Steph. Catal. 171. No. 1743. 



Pitchy-black : head finely punctured ; rostrum punctulated at the base : thorax 

 thickly punctate, and generally with a line of cinereous pubescence on each 

 side : scutellum very minute : elytra very deeply punctate-striate, the inter- 

 stices somewhat smooth ; towards the base and on the disc are several cinereous 

 patches, composed of delicate pubescence, that is readily abraded : body be- 

 neath punctated and finely pubescent : legs and antennse rufo-piceous. 



Not uncommon in several of the ponds round London, especially 

 on Wandsworth-common : — it also occurs near Darenth, in the 

 vicinity of Bristol, and in Devonshire, and I believe also in Norfolk. 



Genus CCCXVII. — Alophus, Schonherr. 



AntenruB geniculated, 12-jointed, moderate, rather slender, the scape clavate, 

 nearly touching the eyes ; funiculus with the two first joints rather long, ob- 

 conic, the remainder somewhat rounded; the club oblong, subovate. Rostrum 

 rather long, rounded, incrassated towards the apex : eyes lateral, subovate, 

 depressed: thorax somewhat oblong, convex, with the sides slightly rounded, 

 and lobate behind the eyes : scutellum minute, but distinct : elytra oblong- 

 ovate, convex, united: body oblong, apterous: legs moderate ; Jewiora in- 

 crassated in the middle, unarmed ; tibia rounded, anterior sinuated within, 

 all dilated at the apex, truncate, but not hooked ; tarsi elongated. 



