On Aquatic Carnivorous Coleoptcra or Dytiscidce. 4 77 



tarsi broad, and the unguiculi of the former moderately long, the anterior one being 

 a little shorter than the posterior. 



Europe. (Finland, 68° 55' North, Sahlberg). 339. 



617. Hyphydrus lapponum, Gyll., Hydroporus lapponnm, M.C. — Oblongo-ovalis, 

 sat convexus, tenuiter pubescens, fiisco-niger, (limbo saepe dilutiore), antennis, 

 pedibus capiteque rufescentibus, hoc fusco-notato, antennis ajjicem versus, plus 

 minusve infuscatis ; prothorace elytris evidenter angustiore angulis posterioribus 

 obtusis, limbo punctato, disco loevi ; corpore subtus obsolete punctato. Long. 4l, 

 lat. 2 J m.m. 



Mas, fere opacus, subtiliter punctatus, tarsis anterioribus latis, unguiculis elongatis, 

 fere simplicibus et aequalibus. 



Fern., per-opaca, obsolete jjunctata, tarsis latiusculis. 



Northern Europe and Siberia. (Sweden ; Finland, to G9" North, Sahlberg). 338. 



618. Hydroporus fortis, Lee, M.C. — Oblongo-ovalis, convexus, dense subtilissime 

 punctatus, evidenter pubescens, niger, pedibus fuscis, antennis elongatis fuscis, basi 

 rufo ; corpore subtus fere opaco, coxis posterioribus crebre sed obsolete punctatis ; 

 abdomine fere dense punctato ; prosterni processu latiusculo, sat compresso, medio 

 haud carinato, anterius leviter tuberculato-prominulo. Long. 6^, lat. 3j m.m. 



Mas, tarsis anterioribus et intermediis fortiter dilatatis, illis unguiculis elongatis, 

 tenuibus, basi haud curvatis. 



I have seen only a single specimen of this very distinct species, for which I know- 

 no near ally. 



North America. 337. 



619. Hydroporus americanus, Aub^, M.C. — Oblongo-ovalis, convexiusculus, 

 crebre punctatus et pubescens, fusco-rufus, pedibus capiteque rufis; coxis posterioribus 

 sparsim fortiter punctatis ; abdomine tantum basi utrinque fortiter sparsim punctato ; 

 prosterni processu anterius nullo modo prominulo. Long. 4, lat. 2|^ m.m. 



Mas, subnitidus, elytris evidenter punctatis, tarsis anterioribus vix dilatatis. 

 Fern., opaca, elytris minus fortiter punctatis. 



Aub^'s unique type of this species is a small, very red, and rather strongly 

 punctured individual. 



North America ; (Massachusetts). 336. 



620. Hydroporus dichrous, Melsh., M.C. — Oblongo-ovalis, evidenter pubescens, 

 crebre subtiliter punctatus, nigricans, pedibus capite thoraceque rufis ; elytris fuscis, 



3 Q J 



