266 On Aquatic Carnworous Coleoptera or Dytiscide. 
tibuis anterioribus femoribusque intermediis versus apicem nigris, pectore abdomine- 
que fuscis. 
Fem., antennis fere regularibus ; corpore subtus conclore. 
Europe: including Corsica, Sardinia, and Capria ; an abundant species. 522. 
22. Noterus convexiusculus, Reiche, M.C.—Mas, mari Dytiscic apricornis omnino 
similis, sed elytris punctis vix magnis, parcioribus, anterius seriatis et desinentibus. 
Long. 42, lat. 23 m.m. 
I think it probable this will prove to be a variety of Dytiscus capricornis (No. 21). 
I see nothing to distinguish it except the diminished punctuation of the elytra. 
Syria. 523. 
23. Noterus ponticus, n. sp.—Ovalis, latiusculus, sat convexus, nitidus, testaceus, 
elytris castaneo-testaceis punctis tantum minutis munitis ; prosterno medio subtilius 
earinato. Long. 4%, lat. 23 m.m. 
Mas, antennis incrassatis, irregularibus, articulis 5° et 6° longitudine 
subeequalibus haud transversis; genis prosternoque utrinque nigris; pedibus 
anterioribus magis obscuris. 
Fem., antennis fere regularibus ; corpore subtus concolore. 
This species resembles Noterus levis (No, 25), but is very distinct from it by the 
male antennze which are formed as in Dytiscus capricornis (No. 21) and by the 
absence of the pubescent spot on the hind femora; it is readily distinguished 
from Dytiscus capricornis, by the absence of the large punctures on the elytra, and by 
the more finely carinate prosternum ; the antenne of the male although similarly 
formed to those of Dytiscus capricornis are slightly broader. 
Mesopotamia. 615. 
24, Noterus japonicus, Sharp, Tr. Ent. Soc. Lond., 1873, p. 52.—Ovalis, latiusculus, 
convexus, nitidus, castaneus, antice dilutior ; elytris apicem versus punctis minutis 
anterius seriatis. Long. 43, lat. 23 m.m. 
Mas, antennis paulo incrassatis, articulis 6—10 magnitudinibus subzequalibus ; 
capite subtus utrinque, prosterno anterius abdomineque colore obscurioribus, 
femoribus tibusque anterioribus nigris ; prosterno medio haud carinato. 
Fem., corpore subtus pedibusque ferrugineis concoloribus, prosterno medio sat 
carinato. 
Though very similar to Noterus levis (No, 25) the species is readily distinguished 
by the absence of the pubescent spot on the hind femora, and by the different 
characters of the male. 
Japan. 525, 
