THE CANADIAN ENTOMOLOGIST. 31 



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 series of punctures, not numerous nor 

 regularly arranged, which do not reach the apex ; there are a very few scat- 

 tered punctures besides in the side : legs mahogany-colour. 



T02. Colymbetus (Agabus) Ph^eoptkrus Kirby. — Length of body 

 3j/( — 3^2 lines. Two specimens taken in Lai. 54° 



Body nearly elliptical, rather depressed, smooth, very black, glossy. 

 Head with a pair of transverse obscure red spots in the vertex ; mouth and 

 antennae testaceous : posterior series of the prothorax 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. Semi- , 

 punctaiuS) but fewer punctures in the side: legs ferruginous : body under- 

 neath 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. [Placed with a. mark of interrogation as a synonym of Agabus 

 obliteratus Lee, in Le Conte"s List, p. 17.] 



[71.] 103. Colymbetes (Agabus) Bifarius, Kirby. — Plate v., fig. 6. 

 Length of body 3^ lines. A single specimen taken in Lat. 54 . 



Body oval, smooth, black, less glossy. Head with a pair of vertical 

 red crescents: mouth, antennae and palpi ferruginous: maxillary palpi with 

 the last joint black : prothorax longitudinally acuducted, with the bead of 

 the lateral margin rufous: elytra, at the base longitudinally, at the apex 

 transversely, acuducted: fore-breast. and legs piceo-rufous. 



104. Colymbetes Reticulatus, Kirby. — Length of body 3^ lines. 

 Three specimens taken in Lat. 65°. 



Body oblong, black, gloss obscured from its being covered as it were 

 with a wel) of the finest net work, sculptured as if with the point of a 

 needle. Head with a pair of round red vertical spots: prothorax with a 

 yellow mesal band and lateral margin: elytra dusky-cinereous, with the side 

 yellowish: legs ferruginous. [Not mentioned in either Le Conte's or 

 Melsheimer's Catalogues. ] 



105. Colymbetes Picipes, Kirby. Length of body 4 )^ lines. Two 

 specimens taken, one in Lat. 54°, the other in Lat. 65 . 



[72.] Body oyal, black, above slightly bronzed,, not glossy, covered 

 above and below like the preceding species with, as it were, a web of net- 



