458 On Aquatic Carnivorous Coleoptera or Dytiscide. 
conspicue punctato; elytris sat crebre et fortiter punctatis ; coxis posterioribus 
sparsim punctatis. Long. 4, lat. 2 m.m. 
Mas, nitidus, evidenter punctatus, tarsis anterioribus et intermediis articulo 
basali majusculo. 
Fem., (a) ut in mare punctata et nitida. 
(b) 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, (Sahlberg) 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 subleevi, 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. 
Fem., (a) ut in mare nitida et punctata. 
(b) 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 puuctured, 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 Reveliére, of Porto Vecchio, to 
whom we are very largely indebted for our knowledge of the Coleoptera of Corsica. 
Corsica. 1152. 
560. Hydroporus teres, n. sp.—Ovalis, parum convexus, tenuiter pubescens, niger, 
antennis pedibus elytrisque rufis; prothorace parum punctato, disco levigato ; 
elytris parum crebre, subtiliter punctatis, punctis versus apicem obsoletis ; coxis 
posterioribus sat fortiter punctatis ; abdomine segmento ultimo apice crebre confuse 
punctato. Long. 33, 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 antenne and wing-cases. 
