On Aquatic Carnivorous Coleoptera or Dytiscidw. 485 



sparsiru subtilisslme punctatis ; pro.bterui processu latiusculo ; coxis posterioribus 

 subtiliter punctati? ; abdomine segmeiito ultimo confertim subtiliter punctato. 

 Long. 4, lat. 21 iii.m. 



I have seen only one individual of this, the largest species of the group, it is 

 rather larger than our European H. lituratus (No. 5G9). 



North Ameiica, (California, found by Mr. H.ardy). 407. 



G44. Hydroporus belfragei, n. sp. — Oblongo-ovalis, depressus, sine pubescentia, 

 subnitidus, ferrugineus, abdomine pectoreque nigris, elytris furrugineo-testaceis ; 

 ubique parce obsoleteque punctatus. Long. 3, lat. Ij m.m. 



I have seen but a single individual of this distinct species, though allied to H. 

 vilis (No. G41), it is more depressed, brighter coloured, and has the prosternal process 

 rather more elongate, and distinctly carinate along the middle near the apex. 



North America, (Texas, sent by Belfrage). 408. 



GllOUl' 9. 



645. Hydroporus difformis, Lee, M.C. — Oblongo-ovalis, elongatus, sine pubes- 

 centia, sat nitidus, piceus, supra dilutior, antennis pedibusque rufis ; elytris crebre 

 paruni subtiliter, distincte punctatis, punctis apicem versus paulo crebrioribus ; 

 corpore subtus nitido, subloevi, abdominis lateribus strigulosis. Long. 5 1, lat. 3 m.m, 



I have seen only a single individual of this large and remarkable species, which 

 by its appearance calls to mind the estriate Copelati ; the specimen is probably a 

 female. 



The species seems to be very pe3uliar, and will no doubt prove generically distinct, 

 meanwhile it appears best placed near H. oblongus, from which it differs by the 

 rather widely separated middle coxaj, the very large prosternal process, Avhich is 

 elevated at the sides and along the middle, and terminates iu front as a strongly 

 elevated projection ; the metasternum is broadly but obscurely depressed in the 

 middle in front ; and the coxal lines are but little turned outwards near the extremity. 

 The highly developed coxal lobe, with very rounded extremity quite pi-otects the 

 articular cavity, as in H. oblongus. 



North America, (Georgia, Boston). 2G8. 



646. Hydroporus oblongus, Steph., M.C. — Oblongo-ovalis, elongatus, sine 

 pubescentia, nitidus, niger, supra fusco-castaneus, antennis pedibusque rufescentibus, 

 elytris sparsim distincte, apicem versus crebrius punctatis ; corpore subtus fere 

 impunctato. Long. 5, lat. 2.1 m.m. 



3 R 2 



