DYTISCIDiE. 71 



(103) 4. * Colymbetes bifarius. Bif avian Colymbetes. 



C. fbifariusj ovalis, niger, obscuriusculus ; antennis, ore, pedibus, thoracisque margine latcrali, rufis ; elytris bifariam acuductis. 

 Bifarian Colymbetes, black, not glossy ; antennae, mouth, legs, and lateral margin of the prothorax, rufous ; elytra acuducted 

 two ways. 



PLATE V, FIG. G. 



Length of the body 3^ lines. 



A single specimen taken in Lat. 54°. 



DESCRIPTION. 



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 : 2 forebreast and legs piceo-rufous. 



(104) 5. * Colymbetes reticulatus. Reticulated Colymbetes. 



C. ! reticulatus J oblongus, niger, supra reticulatim acuductus ; elytris nigricantibus ; latere, prothoracisque fascia media, fiaves- 



centibus ; pedibus ferrugineis. 

 Reticulated Colymbetes, oblong, black, acuducted like network ; elytra dusky-cinereous, with the side and the mesal band 



of the prothorax yellowish ; legs ferruginous. 



Length of the body 3| lines. 



Three specimens taken in Lat. 65°. 



DESCRIPTION. 



Body oblong, black, gloss obscured from its being covered as it were with a web of the finest 

 network, 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 yellow- 

 ish : legs ferruginous. 



(105) 6. * Colymbetes picipes. Pitch-legged Colymbetes. 



C. f picipes J ovalis, supra aneo-niger, obscurus, reticulatim confertissime acuductus ; ore antennisque ferrugineis ; pedibus quatuor 



anterioribus piceis. 

 Pitch-legged Colymbetes, oval, above bronzed-black ; very thickly acuducted like network ; mouth and antenna; ferruginous ; 



four anterior legs piceous. 



Length of the body A\ lines. 



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



2 Plate V, Fig. 6 a. 



