58 COLEOPTERA. 



C. Waterhouse, who took it at Kingsbury Reservoir. Its 

 place is at the extreme end of the genus. It most nearly 

 resembles T. pusillus, but may be distinguished from that 

 species by its smaller size and decidedly narrower form ; the 

 elytra, moreover, are fuscous instead of fusco-testaceous, and 

 the head and thorax almost of the same width, the latter a 

 very little narrower than the elytra, with its sides somewhat 

 contracted towards the base and scarcely rounded in front, 

 the fovege on the disc being somewhat indistinct ; the thorax, 

 indeed, may be shortly described as sub-quadrate, instead of 

 transversely sub-cordate, as in j^usillus. 



33. Omalium riparium, Thomson, Ofv. af Vet. Ac. Forh. 



1856, 224, 3 ; id., Skand. Col. iii. 212, 3 ; G. R. 



Waterhouse, Proc. Ent. Soc. 5 Jan. 1863, Zool. 



8416 (1863). 

 fuckola, Kraatz, Ent. Zeit. 1857, p. 286. 

 Taken by Mr. Waterhouse at Southend and elsewhere on 

 the coast ; also by Mr. Bold at Newcastle. Its place in our 

 lists will be next after 0. riviilare, which it resembles very 

 much in size and form ; it may, however, be distinguished 

 from that species by the following characters : — The front of 

 the head is more sparingly punctured, the neck especially 

 being alutaceous and scarcely punctured; the thorax is 

 narrower in front, with its flexuous lateral foveee more 

 deeply impressed in front, and the disc sparingly punctured ; 

 the elytra are longer, pitchy black, and less strongly punc- 

 tured. 



34. Omalium rugulipenne (n. s.). 



O. fusco-piceum, nitidulum; antennis hrevioribus, 

 palpis, pedihusque rufo-testaceis ; capite thoraceque 

 longitudinalUer bifoveolatis, pwictatis ; eJytris Ion- 



