On Aquatic Carnivorous C'okoptej-a or Vytiscidce. 459 



I have seen only a single individual, and although it is not in good condition, it 

 appears to me to be certainly a distinct species. 



Syria, (Dr. Millingen). 1150. 



561. Dytiscus nigrita, Fab., Hydroponis nigrita, M.C. — Ovalis, latiusculus, minus 

 convexus, breviter tenuius pubescens, minus nitidus vel opacus, niger vel piceus, 

 antennis pedibusque rufis illis basi excepto plus minusve infuscatis ; prothorace 

 medio punctis paucis minutis ; elytris minus crebre et fortiter punctatis, jDunctis 

 versus apicem obsoletis ; coxis posterioribus fortiter punctatis ; abdomine apice 

 impunctato. Long. 3, lat. If m.m. 



This is a variable species in size and colour, and even somewhat in sculpture ; 

 specimens occur in which there are to be seen a few distinct punctures on the last 

 ventral segment, and these individuals are generally narrower and have darker legs 

 and antennae, but intermediate specimens occur. I do not see any characters to 

 distinguish the sexes. According to Sahlberg and Wehncke, Hydroporus 

 subalpinus, Th. (No. 1,434, huj. op.), is not distinct from this species, but I cannot 

 myself give an opinion on the point. 



Europe, from Finland, (63° 40', Sahlberg), to the Guadarrama. 389. 



562. Hydroporus brevis, Sahl., M.C. — Breviter ovalis, sat latus et convexus, 

 nitidus, breviter tenuius pubescens, niger, antennis pedibusque rufis ; prothorace 

 disco punctis paucis sparsis, basi utrinque fortius punctato ; elytris sat crebre et 

 fortiter punctatis ; coxis posterioribus fortiter punctatis ; abdomine apice fere 

 impunctato. Long. 2i, lat. I3 m.m. 



The much smaller size, and the more shining surface should prevent this species 

 from being mistaken for a variety of Dytiscus nigrita. Fab. I see no sexual 

 characters. 



Europe. Apparently confined to the noi-th, ascending in Lapland and Finhxnd to GS" north. Arctic 

 Siberia, (.Jenisei), Sahlberg. 388. 



5G3. Hydroporus obscurus, Sturm., M.C. — Ovalis, minus latus, sat convexus, vix 

 nitidus, breviter tenuius pubescens, fusco-rufus, capite, antennarum basi pedibusque 

 dilutioribus, pectore nigricante ; prothorace medio late impunctato, basi sat 

 evidenter punctato ; elytris sat fortiter minus crebre punctatis ; coxis posterioribus 

 fortiter punctatis ; abdomine apice hand punctato ; antennis brevibus. Long. 21, 

 lat. Ih m.m. 



I can see no sexual chai-acters in this small but distinct species. 



Northern and central Europe, and Arctic Siberia; North America ; ascends in Finland to G8° north 

 according to Sahlberg. Jenisei, Sahlberg. The North American habitat is given on the authority of 

 two individuals from the late Andrew Murray's collection. 387. 



TBAN3. ROT. DCB. SOC, M.S., TOL. II. 3 O 



