452 On Aquatic Carnivorous Coleoptera or Dytiscide. 
This species varies somewhat in the marks of the elytra; and the breast is in 
some individuals blackish ; also the punctation of the hind coxz 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 meridionalis, Aubé, M.C.—Ovalis, sat angustus et convexus, 
nitidus, subtiliter parce pubescens, parce obsolete punctatus, fusculus, prothoracis 
lateribus elytrisque dilutioribus, his lineis confluentibus, basi szepius abbreviatis, 
fuscis ; corpore subtus nitido, coxis posterioribus parcissime obsolete punctatis. 
Long. 23, lat. 13 m.m. 
This species much resembles D. flavipes (No. 547), but has no trace of any 
impression near the sides of the thorax. I see no evident sexual characters. 
Southern Europe and Algeria, Persia. 326, 
I 
541. Dytiscus granularis, Lin., Hydroporus granularis 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 seepius elongata; corpore subtus nitido, coxis posterioribus et 
metasterni medio sparsim sat fortiter punctatis. Long. 23, lat. vix 12 m.m. 
Mas, tarsis anterioribus et intermedi leviter dilatatis, anterioribus unguiculis 
paulo elongatis et inzequalibus ; 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° 
(Rahlberg). 312. 
542. Hydroporus bilineatus, Sturm, M.C.—Elongato-ovalis, parum convexus, 
parce subtiliter punctatus et pubescens, nigricans, elytris versus latera lineis 
longitudinalibus duabus testaceis, externa lata et seepius 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. 23, lat. 14 m.m. 
Mas, sat evidenter punctatus; tarsis anterioribus fortiter dilatatis, unguiculis 
incequalibus valde elongatis. 
Fem., minus nitida, subtilius punctata. 
