On Aquatic Carnivorous Coleoptera or Dytiscide. 399 
punctorum impressis obsoletis ; corpore subtus nitido, coxis posterioribus anterius 
sat crebre profunde punctatis. Long. 43, lat. 23 m.m. 
Mas, tarsis anterioribus unguiculo externo leviter incrassato et abbreviato. 
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. 
North China, (Kiu Kiang, found by Mr. Lewis). 206. 
394. Hydroporus turbidus, Lec., M.C.—Ovalis, subtus convexus, sine pubescentia, 
nitidus, pectore abdomineque nigricantibus ; elytris sat crebre et fortiter, insequaliter 
punctatis; coxis posterioribus punctis magnis et profundis. Long. 3, lat. 15 m.m. 
This species in size and general appearance approaches Dytiscus inzequalis (No. 
381), and its allies, and the front tarsi (of the only individual I have seen) are 
scarcely so developed as in that species: the front of the clypeus 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, eequaliter punctatis, serie punctorum impressa; coxis posterioribus 
abdomineque basi utrinque dense punctatis. Long. 4, lat. 25 m.m. 
Mas, tarsis anterioribus leviter dilatatis, unguiculo interno leviter incrassato. 
Mexico. 217. 
396. Hyphydrus marklini, Gyll., Hydroporus Markliu, 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 33, 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 
coxee 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. 
