98 DESCRIPTION OP INSECTS 



5. C. *nitidus black ; elytra with about three irregular series 

 of punctures on each ; lateral edge of the thorax arquated 

 each side. 



Length three-tenths of an inch. 



Dytiscus nitidus. Melsh. Catal. 



Body black, immaculate, polished, and divided into very mi- 

 nute, irregularly orbicular granules, beneath black. 

 Head, a transverse, abbreviated, frontal line each side, su- 

 perior punctures obsolete or wanting ; antennce and palpi 

 rufous. 

 Thorax, dorsal line abbreviated, central, lateral edge ar- 

 quated, posterior angles subacute. 

 Elytra with three irregular series of villous punctures, and 

 a submarginal and sutural less distinct one; epipleura 

 black. 

 Sternum acutely carinated, depressed behind ; feet piceous, 

 anterior ones rufous. 



The chief difference between this species and the prece- 

 ding one appears to rest in the general form and size of the 

 body, the colour and markings being nearly the same; the 

 present is much smaller, of a more rounded oval, and much 

 more obtusely rounded before. 



6. C. *bicarmatus reddish-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 ob- 

 solete. 



Elytra attenuated behind, rather darker tlian the thorax, 

 about three obsolete irregular series of punctures. 



Sternum bicarinate ; feet, anterior pairs paler. 



7. C. *venustus pale rufous, beneath testaceous ; elytra 

 blackish lincated with whitish. 



