442 Mr. David Sharp on the 



This is very closely allied to D^/isa/s im2))'esso-2}unctatus, 

 but has a much more scanty punctuation, and the under 

 surface is shining ; it is equally near to Coelamhus chi- 

 nensis, but is more closely punctate, and has black lines 

 on the wing-cases. 



This is apparently rare, only four examples having 

 been met with. Junsai, August 29th, 1880 ; Uyeno, 

 Tokio, in the latter part of autumn. 



Deronectes anchoralis. 



Oblongo-ovalis, subdepressus, subopacus, subtus nigricans, 

 capite in medio prothoracisque lateribus testaceis, supra testaceus, 

 capitis vertice prothoraceque anterius et late in basi nigris, elytris 

 nigro-lineatis, lineis confluentibus liic iude maculis interruptis 

 testaceis ; antennis pedibusqne testaceis, illis extrorsuni, his tarsis 

 nigricantibus. Long. 5 — 5^ mm. 



Mas, tarsis anterioribus fortiter dilatatis, ungniculis longissimis, 

 fere rectis. 



This species belongs to Group 4 A of my monograph, 

 and may be placed near Dytiscus depressus, Fab., though 

 not closely allied to any other species ; the male is very 

 remarkable on account of its elongate claws, which are 

 quite as long as all the rest of the tarsus. The punctua- 

 tion of the surface is excessively dense, and the sutural 

 series of punctures on each wing-case is very distinct ; 

 the thorax is rounded at the sides and narrowed behind, 

 and the denticle near the extremity of each elytron is 

 very evident in each sex. 



A good series of this species was found at Chiuzenji 

 the fourth week in August, 1881 ; they were found 

 amongst weeds in the very strong-running stream which 

 feeds the lake there. 



Deronectes simpUcipes. 

 Oblongo-ovalis, nitidus, testaceus, prothorace anterius nigiicante, 

 basi maculis duabus plus minusve conjunctis nigris, elytris lineis 

 confluentibus nigi-is, hie inde maculis testaceis interruptis ornatis ; 

 prosterno, pectore abdomineque nigris, antennarum palporumque 

 apicibus fuscis ; prothorace lateribus obliquis baud rotundatis, 

 angulis posterioribus rectis. Long. 4 mm. 



This species should be placed next Hydroporus sardiis, 

 Har. Its surface is very nearly smooth ; there is, how- 

 ever, a punctuation along the anterior margin, and more 



