784 On Aquatic Carnivorous Coleoptera or Dytiscidw. 



1327. HydrocanthuH nanulus, Lee, New. spec. Col. I, 1863, p. 22. North America. 



" Elongato-ovalis, postice paulo magis attenuatus, rufo-testaceus, nitidiis, impunctatiis, elytris panic 

 saturatioribus, antennis petlibusque palUdioribus. Long. -05." 



"Louisiana ; Dr. ScLaiim. The very small size at once distinguishes this from all other species of the 

 genus; it is more regularly oval, and less convex than the others." 



1328. Hydrocanthus rubripes, Boh,, Eugen. Res., p. 19. Monte Video. 



" Oblongo-ovalis, convexus, niger, nitidus, postice modice attenuatus ; capite, anteunis, prothorace ad 

 latera confuse pedibusque rubris ; elytris tiibus minonim punctorum seriebus leviter impressLs. Long. 

 2i, lat. 1| m.m." 



" Summa similitudo H. nigi-iui, semper dimidio fere minor, prtesertim brevier, posterius minus 

 attenuatus. Caput feri-ugineum, nitidum Iseve, postice parum infuscatum, apice utrinque puncto profundo 

 impressum. Palpi ferruginei. Oculi rotnndati, modice convexi, glauci. Antennse ferrugineae. Prothorax 

 longitudine duple latior, apice late, leviter rotundato-emarginatus, basi utrinque subsinuatus, medio breviter 

 Bub-triangulariter productus, lateribus tenuiter reflexo-marginatis, pone apicem leviter rotundato-ampliatis, 

 angulis anticis antrosum prominulis, acutis, posticis fere rectis ; superne convexus, niger nitidus, 

 extrorsum plus minusve late, confuse ferrugineus, Ijevis, antice postice et ad latera subtiliter punctulatus. 

 Scutellum nullum. Elytra antice subtruncata, prothorace non latiora at illo fere duplo et dimidio longiora, 

 pone basin apicem versus sensim angiistata, apice conjunctim subacuminata ; nigra, nitida, extrorsum 

 interdum confuse ferruginea, singulo .seriebus tribus e punctis parris, sat crebris notato ; margine inflexo, 

 fen'ugineo. Corpus subtus nigro-piceum, nitidum, subtiliter, crebre pimctulatum. Pedes rufo- 

 ferruginei." 



This is no doubt a Canthydrus, and is perhaps allied to C. brevicornis (No. 45). — D. S. 



1329. Hydrocanthus socius, Sahl., Act. Soc. Fenn. II, 2, 1844, p. 516. Rio Janeiro. 



" Oblongo-ovatus, postice angustato-acuminatus, ferrugineo-testaceus ; elytris ad basin thoracis 

 latitudine, brunneis, testaceo-irroratis, sutura apiceque obscurioribus, capite et thoraee fulvescenti testaceis. 

 Long. If lin., lat. H lin." 



" Statura et magaitudo H. laevigatL Caput convexum, fulvo-testaceum, subnitidum, Iseviusculimi. 

 Oculi magni, grisei, medio nigri. Palpi et antennae testacea. Thorax fulvo-testaceus, nitidus, glaber, 

 antice parum infuscatus, longitudine sua plus duplo latior, antice late emarginatus, angustior, angulis 

 subacutis, lateribus parum rotuudatis, postice latior, angulis subrectis, basi sinuatis. in medio breviter 

 sed acute productus, supra laevis, punctis paucis ad marginem anteriorem subtUissimis. Scutellum non 

 conspicuum. Elytra elongata, antice thoracis latitudine, usque ad medium sensim rotiuidato-dilatata 

 versus apicem angustato-acuminata, brunnea, testaceo-irrorata, sutura apiceque obscurioribus, margine 

 inflexo testaceo, pilis raris versus apicem albescentibus sparsis. Corpus subtus testaceo-ferrugineum 

 abdomine infuscato. Pedes testacei." 



This may possibly be a sm.all species of Hydrocanthus near H, debilis (No. 78), or a Canthy 

 dms.— D. S. 



1330. Hydrocanthus testaceus, Boh., Res. Eugen., p. 19. China. 



" Oblongo-ovalis, postice attenuatus, convexus nitidus, rufo-testaceus ; prothorace Isevi, antice postice- 

 que tenuiter infuscato ; elytris impunctatis. Long. 2, lat. 1^ m.m." 



" Statura H. nigrini, multo minor, aliter coloratus. Caput modice convexum, rufo-testaceum, nitidum 

 Iffive. Palpi rufo-testacei. Oculi rotundati, parum convexi nigri. Antennae rufo-testaceae. Prothorace 

 longitudine duplo latior, apice late, leviter rotundato-emarginatus, basi utrinque sub-sinuatus, medio 



