Odhehias.'] nvDKOPiiiLiD.E. 247 



O. punctatus, Steph. (hibcrjiicus, Curt.), Elongate, dark-brassy, 

 somewhat iridescent, upper surface clothed "with long pubescence ; thorax 

 transverse, with sides rounded, posterior angles excised and filled with 

 membrane, disc with a dorsal furrow and two impressions on each side ; 

 there are also two lateral impressions united by an impressed line ; elytra 

 tliickly and confusedly punctured ; legs reddish testaceous, tarsi dark ; 

 the apex of palpi is also dark. L. 3 mm. 



Local ; occurring only in the south-east and south of Knirlaud : Slieerness ; 

 Worthinor ; Isle of Wight; Lyniiugton Salterns; Pegweil Hay; O. hihernicus, 

 which appears to he syuouymous witli this insect, has hecii taken near Belfast and 

 Portmarnock. 



(I have received from Mr. "W. G. Blatch a specimen of Odhehius 

 which was taken by himself at Clacton-on-Sea, and returned to him 

 frum the Continent as 0. inij'ressicoKifi, Lap. : the specimen appears to 

 agree with a rather dull reddish variety of 0. hicolon taken by Mr. 

 Champion in Sheppy, and forms perhaps the connecting link between 

 this latter species and 0. rufimargiyiatus. The synonymy in the last 

 European catalogue is as follows : 0. hicolon. Germ. = striatm, Lap. = 

 rujimarginatus, Steph.; 0. inipressicollis, Lap. = hicolon, Steph.) 



IIVDRSINA, Kugelann. 



About thirty species are comprised in this genus, chiefly from Europe, 

 hut a few come from North America, Teueritre,&c.,and one from Australia; 

 they are chiefly remarkable for their very long maxillary palpi; they are 

 usually black or reddish brown, and have no metallic lustre like the 

 Octhebii ; they are, as a rule, found in running water, attached to stones 

 or logs ; like their allies they are very poor swimmers ; tlie males and 

 females differ considerably in the shape of the palpi and tibia?, and also 

 sometimes of the femora : the species are in many cases hard to deter- 

 mine ; the chief characters are found in their general shape and colour, 

 and also in the number of the rows of punctures between the suture of 

 tlie elytra and the humeral angle; the under surface is clothed with 

 tliick silky pubescence. 



I. Each elytron with more than six rows of punctures be- 

 tween the suture and the hnnieral angle. 



i. Thorax testaceous with the disc at most darker, elytra 



more or less testaceous IT. testack*. Curt. 



ii. Thorax dark with tlie extreme margins only testaceous II. PALLsruis, Er. 



iii. 'J'liorax entirely dark. 



1. Elytra with sides more or less rounded ; thorax 

 with ohliipie impressions indistinct ; rows of 

 punctures between suture of elytra and humeral 

 angle i) or 10. 



A. Size larger ; elytra not dilated heliind . . . II. kii'MMV, a'"//. 



B. Size smaller ; elytra dilated behind .... II. mjhiia, (ifrm. 



2. Elytra with sides almost parallel ; thorax with 

 tA'o strong ohli(|ue or longitudinal impressions; 

 rows of punctures between suture of elytra and 



humeral angle 8 II. a.\oust.\t.v, Sturm. 



