548 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



iigulis posterioribus bene acutis; elytris crebrius obsolete reticulatis, punctis 

 subseriatis minutis; thorace margine lateral! iiullo ; prosterni processu lato, apice 

 acuminato ; lineis coxalibus uullis. Long. S, lat. i\ m.m. 



The male has the basal joints of the front and middle tarsi distinctly incrassate, 

 and furnished beneath with rather short glandular hairs, and in the same sex there 

 are three or four striae on each side of the apical ventral segment. 



South America, (Peru). 825. « 



I. bl.—GenMs AGABINUS. 



Coxal lines deeply impressed, and very little sinuate so as to be subparallel, 

 the coxal border continued forwards to the posterior border of the metasternum. 

 The genus consists of a Californian species. 



777. Colymbetes glabrellus, Motsch., M.C. — Ovalis, sat convexus, pernitidua 

 fere Isevigatus, niger, antennis pedibusque rufis vel piceis ; thorace cum elytris 

 continuo, angulis posterioribus subrectis ; elytris punctis seriatis minutis ; tarsis 

 posterioribus gracilibus ; lineis coxalibus subparallelis, versus apicem nullo modo 

 extrorsum abductis. Long. 4f, lat. 3^ m.m. 



The male characters are very slight, there is scarcely any incrassation of the front 

 and middle tarsi, and their two basal joints only are furnished beneath with small 

 patches of glandular hairs. 



North America, (California). 833. 



L 52.— Genus PLATAMBUS. 



Epipleurae behind the middle comparatively broad. 



The three species are found in the European and Japanese regions. 



778. Dytiscus maculatus, Linn,, Agahus maculatus, M.C. — Ovalis, sat convexus, 

 ferrugineus, vertice, prothorace anterius et posterius elytrisque infuscatis, his 

 margine laterali signaturisque plus minusve extensis testaceis ; prothorace baud 

 brevi, margine laterali tenui, angulis posterioribus acutis ; elytris ad basin ssepius 



