452 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



This species varies somewhat in the marks of the elytra ; and the breast is in 

 some individuals blackish ; also the punctation of the hind coxte is not quite so 

 coarse in the Russian individuals as in the Algerian. I can see no distinct sexual 

 characters. 



Algeria, Greece, Southern Russia, Sardinia, Corsica. 325. 



540. Hydroporus merldionalis, Aub^, M.C. — Ovalis, sat angustus et convexus, 

 nitidus, subtiliter parce pubescens, parce obsolete punctatus, fusculus, prothoracis 

 lateribus elytrisque dilutioribus, his lineis confluentibus, basi srepius abbreviatis, 

 fuscis ; corpore subtus nitido, coxis posterioribus parcissime obsolete punctatis. 

 Long. 2^, lat. H m.m. 



This species much resembles D. flavipes (No. 5-17), but has no trace of any 

 impression rear the sides of the thorax. I see no evident sexual characters. 



Southern Europe and Algeria, Persia. 326. 



F. 



541. Dytiscus granularis, Lin., Hydroporus granidaris M.C. — Ovalis, parum con 

 vexus, parce subtiliter punctatus et pubescens, vix nitidus, nigricans, elytris versus 

 latera lineis longitudinalibus duabus testaceis, interna ad basin dilatata, externa lata 

 minus discreta; antennis pedibusque rufis vel fuscis ; prothorace versus latera stria 

 impressa profunda ssepius elongata ; corpore subtus nitido, coxis posterioribus et 

 metasterni medio sparsim sat fortiter punctatis. Long. 2l, lat. vix 1 1 m.m. 



Mas, tarsis anterioribus ct intermediis leviter dilatatis, anterioribus unguiculis 

 paulo elongatis et inoequalibus ; tibiis posterioribus dilatatis intus setoso-pectinatis. 



This species varies a good deal in colour, the lines of the elytra are sometimes 

 broad, ill-defined and confluent, and in extreme cases the whole of the external 

 portion of each elytron is broadly ferrugineous. 



Europe. This is a rather common species in Central Europe, and extends in the North to 63° 

 (Sahlberg). 312. 



542. Hydroporus bilineatus, Sturm, M.C. — Elongate- ovalis, parum convexus, 

 parce subtiliter punctatus et pubescens, nigricans, elytris versus latera lineis 

 lono-itudinalibus duabus testaceis, externa lata et stepius linea fusca divisa, pedibus 

 rufis, antennis fuscis basi rufo, prothorace versus latera stria impressa abbreviata, extus 

 eamdem testaceo ; corpore subtus nitido, coxis posterioribus parce obsolete punctatis. 

 Long. 2|, lat. 1| m.m. 



Mas, sat evidenter punctatus ; tarsis anterioribus fortiter dilatatis, unguiculis 

 insequalibus valde elongatis. 



Fern., minus nitida, subtilius punctata. 



