•2G(j On Aquatic Carnivorous Coleoptera or Dytiscidie. 



tibiis anterioribus femoribusque intermediis versus apicem nigris, pectore abdomiiie- 

 que fuscis. 



Fern., antennis fere regularibus ; corpora subtus conclore. 



Europe : including Coraica, Sardinia, and Capiia ; an abundant species. 522. 



22. Noterus convexiusculus, Reiche, M.C. — Mas, mari D3'tiscic apricornis omnino 

 similis, sed elytris punctis vix magnis, parcioribus, anterius seriatis et desineutibus. 

 Long. 4i, lat. 2j 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 

 carinato. Long. 4i, lat. 21 m.m. 



Mas, antennis incrassatis, irregularibus, articulis 5° et 6° longitudine 

 subsequalibus baud transversis ; genis prosternoque utrinque nigris ; pedibus 

 anterioribus magis obscuris. 



Fcm., antennis fere regularibus ; oorpore subtus concolore. 



This species resembles Noterus lasvis (No. 25), but is very distinct from it by the 

 male antennas 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 antennae of the male although similarly 

 formed to those of Dytiscus capricornis are slightly broadei*. 



Mesopotamia. G 1 5. 



24. Noterusjaponicus, 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. 22 m.m. 



Mas, antennis paulo iucrassatis, articulis G — 10 magnitudinibus subtequalibus ; 

 capite subtus utrinque, prosterno anterius abdomineque colore obscurioribus, 

 femoribus tibiisque anterioribus nigris ; prosterno medio baud carinato. 



Fern., corpore subtus pediljusque ferrugineis concoloribus, prosterno medio sat 

 carinato. 



Though very similar to Noterus lasvis (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. 



