512 TRANSACTIONS OP THE 



and markings being nearly the same ; the present is much smaller, 

 of a more rounded oval, and much more obtusely rounded before. 

 [Also an Ar/alns. — Leg.] 



6. C. BICARINATUS. — Kcddish-brown, punctured ; sternum bi- 

 carinated. 



Length rather more than three-tenths of an inch. 



Body reddish-brown or ferruginous, oblong- oval, with minute 

 numerous punctures ; head, lateral frontal line oblique, puncture 

 above wanting; thorax, a submarginal slightly rugose line, dorsal 

 line obsolete ; elytra attenuated behind, rather darker than the 

 thorax, about three obsolete irregular series of punctures ; sternum 

 bicarinate ; feet, anterior pairs paler. 



[The type of the genus Matus Aube. — Lec] 



7. C. VENUSTUS. — Pale rufous, beneath testaceous; elytra 

 blackish lineated with whitish. [99] 



Length about three-tenths of an inch. 



Body pale rufous, minutely punctured, beneath testaceous tinged 

 with reddish, minutely lineated ; head blackish at base ; antennae 

 and palpi testaceous ; thorax at the middle of the base and tip 

 blackish ; elytra blackish, with very minute, numerous fenestrate 

 punctures, a submarginal whitish line interrupted at tip, passing 

 round the humerus, and falcate on the base, an abbreviated sub- 

 sutural one at base, hardly attaining the middle, and two or three 

 smaller obsolete ones near the marginal line; sternum acutely 

 carinated. 



A remarkably handsome and distinct species. It is not common, 

 and may probably prove to be the interrogatus of Fabricius. 



[This is D. inter rogatus Fabr., and constitutes the genus Copto- 

 tomus Say, infra. — Lec] 



8. C. GLYPHicus. — Dark brown or blackish ; elytra profoundly 

 striated. 



Length one-fifth of an inch, 



Dytiscus glyphicus Melsh. Catal. 



Body dark reddish-brown, minutely punctured, beneath blackish, 

 minutely lineated ; thorax with an anterior, indented, rugous, sub- 

 marginal line; elytra with eleven profoundly impressed strise, 

 alternately abbreviated towards the tip, the inner ones abbreviated 



[Vol. IL 



