Jlt^driijxini,'^.] ADEl'llAGA. 187 



side ; elytra ferruginous with the base and other obscure markings lighter, 

 closely and distinctly punctured ; antenna? and legs red ; tarsi with the 

 third joint large ; sexes almost indistinguishable. Long. 4, lat. 2 mm. 



Rare ; running water, especially among moss on mountains and in high localities ; 

 the original specimens of Stephens were taken by Mr. Tiudd at Collingbourne Wood 

 ne;ir Marlborough, and in a stream near Kimpton, Audover ; Whalley, near rieslon, 

 Lancashire; Snovvdon ; Scotland, local. Lowlands and Highlands, Forth, Tay, 

 Moray. 



H. obsoletus, Aube {Ashwurthii, Power). Oval, rather depressed, 

 shining, without pubescence; head red in front, darker behind ; thorax 

 and elytra testaceo-ferruginous with the disc of former dark and the 

 latter more or less obscurely mottled with ligjiter markings ; thorax with 

 disc smootli, depressed on each side towards posterior angles, depressions 

 strongly punctured ; elytra very finely punctured with large and plain 

 scattered punctures ; antenna? and legs r(3d ; breast and abdomen black ; 

 the sexes are apparently indistinguishable externally. Long. 4, lat. 

 2 mm. 



Rare ; North Wales ; Scarborough and Scalby Beck, Yorkshire ; Gosforth, Xorth- 

 uniberland ; Scotland, rare, Solway district (Sharp) ; Balinuto (Fifeshire) (I'ower; 

 one or two specimens at a time in a small pool in a burn alter a storm) ; Dr. Sliarp 

 notes that the occurrence of this species in Britain is strange, as it is a native of Syria 

 and Southern (more especially South- Kastern) Europe. 



K. oblongrus, Steph. (nitidus, Sturm). Oblong oval, rather elongate, 

 without pub(;scence, shining ; head dark reddish, antenna? testaceous 

 red, apex of last joints fuscous ; thorax pitchy Avith sides lighter, very 

 finely ])unctured on disc, more plainly on margins ; elytra pitchy casta- 

 neous, with .sides, base, and shoulders ligliter, rather sparingly and very 

 distinctly punctured, punctuation more close towards apex ; legs red ; 

 underside almost impunctate ; in the male the anterior and middle tarsi 

 arc somewliat dilated, and joints 3-7 of the antenna? are slightly stouter 

 than in the female. Long. 5, lat. 2 J- mm. 



Ponds, &c.; rare; discovered by Dr. Power near Cambridge; Hoiiiing Fen; 

 Askham Bog, York (not uncommon in early spring, although it always occurs 

 sparingly). 



COLYMBETINA. 



Dr. Sharp (1. c. p. 490) divides his complex Colymbetides into two 

 tribes, Agabina and Colymbetina, the former having a group of cilia on 

 the posterior external angle of the hind femora, Avhereas in the latter it 

 is absent. Dr. Horn prefers the character j)resented by the semi-mem- 

 branous piece l)orderiiig the inner edge of the linst ventral plate, which 

 in his Hrst group Agabi is smooth, and in his second group Colymbete.s 

 is rugose ; this latter method of division is of advantage as including 

 several of Dr. Sharp's unassociated genera : the only one of the.se in 

 our fauna is Coptdatus [LUqiterus), which resembles the Agaljina in 

 liaving the semi-membranous piece above referred to smooth, and the 

 C\ilvmbetina in having no group of cilia on the hiuil femur ; with our 



