On Aquatic Carnivorous Coleoptera or DytiscidcB. 527 



738. Agabus conspicuus, Sharp, Tr. Ent. Soc. Lond., 1873, p. 48. — Regulariter 

 ovalis, convexus, minus nitidus, niger, elytris fuscis ad latera minus discrete rufes- 

 centibus, antennis pedibusque anterioribus testaceis, his femoribus ex parte majore 

 nigricantibus, pedibus postei-ioribus nigris ; supra undique subtiliter sed nuUo modo 

 obsolete reticulatus, reticuHs subtransversis haud parvis. Long. 11, lat. 6i m.m. 



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

 incrassate but much compressed, and furnished beneath with rather long hairs 

 bearing large palettes, the fourth joint is rather elongate ; the anterior claws are 

 rather short, and the front one is thickened beneath, and is emarginate at the base, 

 while the hinder one is thickened at the base ; the claws of the intermediate feet 

 are leather long and stout, and simple : there is no sexual difference in sculpture. 



This large species is very regular in its outline, the thorax is laj'ge, and is sinuate 

 at the base near the hind angles, so that these are nearly acute, the hind legs are 

 short and stout, the sculpture of the elytra is more distinct than in Dytiscus sturmi, 

 and the meshes of the reticulation are larger and more transverse in their direction 

 than in that species The colour varies slightly ; when the elytra are expanded it 

 is seen that they are of an obscure yellowish colour, clouded with dense fuscous 

 blotches, which are nearly wanting on the outer part. 



Japan. 803. 



Group 19. 



Coxal lines in their anterior part hut little directed outwards. Prosternal process 

 rather broad, but always compressed ; wings of metasternum large or moderate ; 

 male front tarsi and claws variable. 



Nine species from both Old and New Worlds. 



739. Dytiscus chalconotus, Panz., Agabus chalconotus, M.C. — Ovalis, minus 

 convexus, nitidus, niger, supra a;nescens, prothoracis elytrorumque lateribus plus 

 minusve rufescentibus, antennis pedibusque anterioribus rufis, his femoribus pedi- 

 busque posterioribus picescentibus ; elytris dense subtiliter reticulatis. Long. 8, 

 lat. 4i, m.m. 



The male has the three basal joints of the front and middle tarsi a little incrassate 

 and furnished beneath with moderately long glandular hairs ; the claws of the front 

 feet are moderately long, simple, and very nearly equal : the apical ventral 

 segment is rugose towards the apex especially on each side of the middle. 



The species varies somewhat in size and colour. 



Europe, Sardinia, Algeria. (Sweden, Finland, Britain, Germany, France, Spain). 771. 



