On Aquatic Carnivorous Coleoptera or Dytiscidce. 399 



punctoruin impressis obsoletis ; corpore subtus nitido, coxis posterioribus anterius 

 sat crebre profunde punctatis. Long. i\, lat. Ig m.m. 



Mas, tarsis anterioribus unguiculo externo leviter incrassato et abbreviate. 



This species approaches extremely near to the sparingly punctured forms of Dytis- 

 cus impresso-punctatus (No. 409), but the under surface is quite polished and shining, 

 whereas it is dulled in all the varieties of D. impresso-punctatus I have seen. The 

 male tarsi are not dilated, but I find that in some European males of D. impresso- 

 punctatus they also are scarcely if at all broader than in the female. The North 

 American Hydroporus disimilis is very closely allied to this species. 



Nortli China, (Kiu Kiang, found by Mr. Lewis). 206. 



394. Hydroporus turbidus, Lee, M.C. — Ovalis, subtus convexus, sine pubescentia, 

 nitidus, pectore abdomineque nigricantibus ; elytris sat crebre et fortiter, intequaliter 

 punctatis; coxis posterioribus punctis magnis et profundis. Long. 3, lat. 1| m.m. 



This species in size and general appearance approaches Dytiscus insequalis (No. 

 381), and its allies, and the front tarsi (of the only individual I have seen) are 

 scarcely so developed as in that sjiecies ; the front of the clvpeus is, however, quite 

 without margin, and is distinctly notched in the middle. 



North America, (United States, Boston'). 394. 



395. Hydroporus wardi, Clk., M.C. — Ovalis, sat elongatus, sine pubescentia, sat 

 nitidus, testaceus, pectore abdomineque nigris, elytris vage infuscatis, crebre sat 

 fortiter, sequaliter punctatis, serie punctorum impressa ; coxis posterioribus 

 abdomineque basi utrinque dense punctatis. Long. 4, lat. 2i m.m. 



^[as, tarsis anterioribus leviter dilatatis, unguiculo interno leviter incrassato. 



Mexico. 217. 



396. Hyphydrus marklini, GylL, Hydroporus Marlclini, M.C. — Ovalis, leviter 

 convexus, sine pubescentia, nitidus, abdomine pectoreque nigris, prothorace basi 

 apiceque obscurioribus, elytris fusco-testaceis, sutura angustissime nigra, basi sat 

 crebre, apicem versus crebrius et fortius punctatis. Long 3^, lat. 2 m.m. 



Mas, tarsis anterioribus vix dilatatis, unguiculo interno paulo crassiore. 



The sexual differences in this species are extremely slight, the punctures on the 

 coxra vary a little, but do not cover so large a part of them as in many of the N. 

 American allies. 



Lapland, and Kirghiz Steppes. 218. 



