HYDROPHILIDiE. — BEROSUS. 125 



rather irregularly punctate-striate; the alternate interstices more elevated, espe- 

 cially posteriorly, ashy-brown, with scattered dusky spots, especially towards 

 the suture : body beneath flat, black ; legs dusky-ferruginous, or pitchy, with 

 the tibiae and tarsi paler ; palpi and antennae pale-testaceous ; the club of the 

 latter fuscous. 

 Hy. verrucosus of Marsham is a mere variety of this species, being obscure 

 above, and having the sides of the abdomen slightly verrucose. 



This rare insect has not often been captured in England ; speci- 

 mens have however occurred at Windsor and near York ; and Dr. 

 Leach once picked up a fragment of one in Kensington-gardens. 

 " One pair taken in July, 1824, in Yaxley-fen.'"' — Mr. Chant. 



Genus CHI. — Berosus, Germar. 



Maxillary -palpi thrice as long as the labial, basal joint very minute, second 

 elongate, clavate, third about half the length of the second, robust, attenuated 

 at the base, terminal nearly as long as the second, subfusiform, truncate : 

 lahrum transverse, anterior margin rounded, entire, mandibles tridentate at 

 the apex. Antenna? apparently eight-jointed, the basal joint stout, elongate, 

 clavate, second slender, about half the length of the preceding, attenuated at 

 the apex, the three following small, the remainder forming the club, of which 

 the terminal joint is large and subglobose: A<?a<f nutant : eyes slightly promi- 

 nent : clypeus entire : thorax convex : elytra globose, broader than the thorax, 

 the apex entire : sternum simple : tibiae slightly spinose : posterior tarsi na- 

 tatorious, ciliated. 



From the preceding genus Berosus differs in having the clypeus 

 entire, the external lobe of the maxillse not palpiform, the an- 

 tennae distinctly more than six-jointed, and the thorax more globose 

 and narrower than the elytra ; and from Hydrobius by the promi- 

 nence of its eyes, the different proportions of the maxillary palpi, 

 the comparative smallness of the thorax to the elytra, and the obtuse 

 terminal joint of the antennae. 



Sp. 1. luridus. Oblongo-ovatus, griseo-Jlavescens punctulatus, capite maculdque 

 thoracis medio suhquadratd antice attenuatd ceneo-viridibus. (Long. corp. 

 2 i_ 2 |lin.) 



Hy. luridus. Linne.—Mart. C. pi. 33. f. 10. — Be. luridus. Steph. Catal. p. 59. 

 JVo. 600. 



Oblong-ovate : griseous-yellow ; head thickly and finely punctate, of a brilliant 

 brassy-green: thorax also thickly punctured, with a subquadrate anteriorly 

 narrowed brassy-green spot on the disc: elytra crenate-striated, the inter- 

 stices finely and regularly punctulated, the striae with minute fuscescent spots, 

 and several scattered larger spots on the disc, which are variously placed in 



