70 NORTHERN ZOOLOGY. 



(101) 2. * Colymbetes BicoLOR. Two-coloured Colymbetes. 



C. (bicolor) ater, ellipticus, convexus, nitidus, ore, antennisque testaceis; pcdibus, elytrisque latere externo,brunneis ; prothoracix 

 serie postico continuo. 



Two-coloured Colymbetes, very black, elliptical, convex, glossy ; mouth, and antennae, testaceous ; legs, and elytra exter- 

 nally, mahogany-colour ; posterior series of the prothorax continuous. 



Length of the body 31 lines. 



A single specimen taken in Lat. 54°. 



DESCRIPTION. 



Body nearly elliptical, convex, smooth, glossy, and very black. Reticulations more visible in the 

 head than in the rest of the surface ; a pair of round obscure red spots in the vertex ; mouth, 

 palpi, and antenna, testaceous : anterior transverse series of the prothorax with single punctures at 

 the sides but scattered ones in the middle, posterior series continuous with single and rather distant 

 punctures : elytra externally of a pale mahogany colour ; with a double dorsal series of punctures, 

 not numerous nor regularly arranged, which do not reach the apex ; there are a very few scattered 

 punctures besides in the side : legs mahogany-colour. 



(102) .3. * Colymbetes ph.zeopterus. Brown-winged Colymbetes. 



C. fphaopterusj ellipticus, subdepressus, ater, nitidus ; elytris fuscis, margine laterali dilutioribus ; ore, antennis, pedibusquc, 



ferrugineis : prothorace serie postico interrupto. 

 Brown-winged Colymbetes, elliptical, subdepressed, very black, glossy: elytra brown, externally paler, mouth, antenna;, 



and legs, ferruginous : prothorax with the posterior series interrupted. 



Length of the body 3| — 31 lines. 



Two specimens taken in Lat. 54°. 



DESCRIPTION. 



Body nearly elliptical, rather depressed, smooth, very black, glossy. Head with a pair of trans- 

 verse obscure red spots in the vertex ; mouth and antennas testaceous : posterior series of the pro- 

 thorax thickly punctured, and discontinuous in the middle : elytra brown, a little paler at the base 

 and side; epipleura yellow; sculpture of the elytra like that of C. semipunctatus, but fewer punc- 

 tures in the side: legs ferruginous; body underneath longitudinally scratched. 



This species appears to be the American representative of C. paludosus ( Dytiscus politus 

 Marsh.) which it nearly resembles, but the anterior part of the front is black, and not yellow as in 

 that species ; and the prothorax is wholly black, without a broad rufous margin. 



