402 Oil Aquatic Carnivorous Coleopteia or Di/tiacidie. 



sequaliter subtillter punctatis, serie punctorum impressa minus distincta ; coxis 

 postcrioribus externe minus crebre punctatis. Long. 5, lat 2i m.m. 



This species is readil}^ distinguished from Hydroj^orus nubilus (No. 403), by its 

 larger size, and more finely and densely punctured elytra. I have seen only two 

 individuals, both of which are females, one is shining, the other dull ; the front tarsi 

 are less compressed and are broader than in the corresponding sex of Hydroporus 

 nubilus. 



North America, (Nevada). 209. 



405. Hydroporus fraternus, Lee, M.C. — Ovalis, sine pubescentia, nitidus, 

 ferruginous, abdomine pectoreque nigris, elytris signaturis fuscis, fortiter crebre 

 ffiqualiter punctatis, punctis apicem versus fere densis ; coxis posterioribus, 

 abdomineque ad basin punctis magnis profundis densis. Long. Sh, lat. 28 m.m. 



Mas, tarsis anterioribus fortiter, intermediis sat dilatatis, illis unguiculo interno 

 paulo crassiore. 

 I have seen only a single male of this species. 



North America, (California). 219. 



406. Hydroporus polonicus, Aube, M.C. — Ovalis, fere sine pubescentia, sat nitidus, 

 testaceus, abdomine pectoreque vel nigris vel testacies ; elytris creberrime subtiliter 

 punctatis, punctis ad basin insequalibus ; prothorace elytris evidenter angustiore, 

 lateribus leviter obliquis. Long. 4^, lat. 2? m.m. 



31 as, tarsis anterioribus et intermediis valde dilatatis, anterioribus unguiculis 

 crassis, elongatis, subrectis, externo paulo breviore ; abdomine coxisque posterioribus 

 nigris. 



Fern., abdomine coxisque posterioribus testaceis. 



According to Aub^ there is a female form of this species which is quite dull and 

 more finely punctured. 



Europe, (Poland, Southern Russia). 220. 



407. Ccelambus sahlbergi, n. nom. — 3. Ovalis, fere sine pubescentia, sat nitidus, 

 testaceuS; abdomine pectoreque nigris ; elj'tris creberrime subtiliter punctatis, punctis 

 ad basin insequalibus, prothorace elytris evidenter angustiore, lateribus leviter 

 obliquis ; coxis posterioribus parce sat fortiter punctatis. Long. 4j, lat. vix 2^ m.m. 



Has, tarsis anterioribus et intermediis articulis 1 et 2 leviter dilatatis ; anterioribus 

 unguiculis crassis, elongatis, subrectis, externo paulo breviore. 



I have seen but one individual which scarcely difters from the male of H. 

 polonicus, except by the little dilated tarsi. 



