On Aquatic Carnivorous Coleoptera or Dytiscide. 527 
738. Agabus conspicuus, Sharp, Tr. Ent. Soc. Lond., 1873, p. 48, —Reegulariter 
ovalis, convexus, minus nitidus, niger, elytris fuscis ad latera minus discrete rufes- 
centibus, antennis pedibusque anterioribus testaceis, his femoribus ex parte majore 
nigricantibus, pedibus posterioribus nigris ; supra undique subtiliter sed nullo modo 
obsolete reticulatus, reticulis subtransversis haud parvis. Long. 11, lat. 62 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 rather long and stout, and simple: there is no sexual difference in sculpture. 
This large species is very regular in its outline, the thorax is large, 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 but 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 enescens, prothoracis elytrorumque lateribus plus 
minusve rufescentibus, antennis pedibusque anterioribus rufis, his femoribus pedi- 
busque posterioribus picescentibus ; elytris dense subtiliter reticulatis. Long. 8, 
lat. 44, 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, 
