LIMNIIDiE. — GEORYSSUS. 105 



which they are usually associated ; their habits are similar to those 

 of the former insects, and unlike those of the latter : their location 

 is, however, somewhat exceptionable ; but I know not better where 

 to place them, unless by approximating them to Heterocerus, 

 through the medium of Georyssus, and to Parnus, by means of 

 Elmis: the latter genus, in external characters, somewhat resembling 

 Parnus; and Georyssus having also considerable affinity to Hele- 

 plorus in the structure of the maxillae and labium. 



Two genera only occur in Britain ; thus discriminated : 



A . .,_ , S triarticulato: 93. Georyssus. 



Antenmrum capitulo { uniarticulat0 . 94 Elmis . 



Genus XCIII. — Georyssus, Latreille. 



Palpi short, subequal, with the last joint longer, stouter, ovate. Antennae nine- 

 jointed, the first elongate, subcylindric ; second globose, stout; third very 

 short ; fourth elongate, cylindric ; the two following very short, the remainder 

 forming a subsolid, or obsoletely perfoliated club: head greatly inflexed, 

 hidden beneath the thorax, which is margined : body rather short and globose : 

 legs moderate; tibias slender, slightly excavated laterally; tarsi elongate, 

 filiform, four-jointed. 



This anomalous genus may be distinguished from Elmis by 

 having four joints only to the tarsi; by the antennae being nine- 

 jointed only; by the superior robustness of the terminal joint of 

 the palpi, and by the short, globose body. 



Sp. 1. pygmaeus. Plate XIII. f. 3. Niger, fronte rugulosd, elytris profunde 



punctato-striatis, humeris prominulis. (Long. corp. § — 1 lin.) 

 Pi. pygmaea. Fabricius. — Ge. pygmaeus. Steph. Catal. p. 55. No. 555. 



Minute; black: head opaque, with the forehead unequally rugged: thorax 

 rather shining, narrowed anteriorly, dilated on the sides beyond the middle, 

 the base subsinuated, the disc nearly smooth posteriorly, with a transverse 

 impression beyond the middle, and towards the sides a little rugged : elytra 

 more glossy than the thorax, very convex, with the shoulders prominent, the 

 disc striated with large deep impressions, the interstices finely coriaceous: 

 body opaque black beneath, obsoletely punctate : legs black : antennae fuscous. 



Var. /3. The elytra dusky-pitchy. 



Inhabits damp places in Norfolk and Suffolk, and is occasionally 

 taken near London. 



Genus XCIV. — Elmis, Latreille. 



Palpi very short, nearly filiform, the last joint slightly larger, ovate-cylindric. 

 Antenna? 11-jointed, subfiliform, the joints nearly equal, the last rather larger, 



