458 On Aquatic Carnivorous Colcoptera or Dytiscidoe. 



conspioue punctato; elytris sat crebre et fortiter punctatis ; coxis posterioribus 

 sparsim punctatis. Long. 4, lat. 2g m.m. 



Mas, nitidus, cvidenter punctatus, tarsis anterioribus et intermediis articulo 

 basali majusculo. 



Fern., (a) ut in mare punctata et nitida. 



(6) omnino opaca, subtiliter punctata. 



This species varies a good deal in size, and even in relative width, and the male 

 tarsi also differ in their amount of dilatation. The two forms of the female are 

 very dissimilar. 



Europe, from 67° North, (Salilberg) to Italy. 394. 



559. Hydroporus revelierei, n. sp. — Oblongo-ovalis, minus convexus, fere sine 

 pubescentia, supra piceus, prothorace lateribus late dilutioribus ; abdomine pectore- 

 que nigris, antennis pedibusque rufis ; prothorace medio sublcevi, limbo minus 

 punctato ; elytris sat crebre subtiliter punctatis ; coxis posterioribus sparsim fortiter 

 punctatis. Long. 4, lat. 2 m.m. 



Mas, pernitidus, tarsis anterioribus et intermediis articulo basali sat magno. 



Fern., (a) ut in mare nitida et punctata. 

 (6) subopaca. 



This species is extremely similar to H. insularis (No. 557), but is a little larger, 

 and the basal joints on the front and middle tarsi of the male are smaller : while 

 the female appears usually to resemble the male in sculpture, and even its second 

 form departs but little from the male. It is rather smaller and more depressed 

 than Hyphydrus memnonius, more finely punctured, and the females are different, 

 for one of the two forms of this sex quite resembles the male and the second 

 departs from it comparatively little. 



This species is named in honour of M. Eugene Reveliere, of Porto Vecchio, to 

 whom we are very largely indebted for our knowledge of the Coleoptera of Corsica. 



Corsica. 1152. 



5 GO. Hydroporus teres, n. sp. — Ovalis, parum convexus, tenuiter pubescens, niger, 

 antennis pedibus elytrisque rufis ; protliorace parum punctato, disco laevigato ; 

 elytris parum crebre, subtiliter punctatis, punctis versus apicem obsoletis ; coxis 

 posterioribus sat fortiter punctatis ; abdomine segmento ultimo apice crebre confuse 

 punctato. Long. 3i, lat. vix 2 m.m. 



The species seems rather similar in size and form to Hyphydrus pubescens, (No. 

 568) but the impunctate middle portion of the thorax requires it to be placed near 

 Dytiscus nigrita, from which it is readily distinguished by its larger size, and by 

 the red antenna3 and wing-cases. 



