On Aquatic Carnivorous Coleoptera or Dytiscidce. 501 



681. Agabus japonicus, Sharp, Tr. Ent. Soc. Loncl. 1873, p. 50. — Ovalis, sat 

 convexus, Isevis, nitidus, niger, capite thoraceque vix subsenescentibus, elytris fuscis, 

 basi humerisque vage rufescentibus, antennis tilnisque quatuor anterioribus, 

 femoribus pedibusque posterioribus piceis. Long. 7, lat. 41 in.m. 



The male has only an extremely slight incrassation of the front and middle tarsi, 

 and only a very narrow space on their underside clothed with glandular hairs ; and 

 the claws are simple. 



The species much resembles Dytiscus paludosus, but is rather broader, more oval, 

 and the elytra and the thorax have their outline very continuous: and the serial 

 punctures of the elytra are finer. 



Japan ; North C'liina. 780. 



682. Agabus sequalis, n. sp. — Ovalis, sat convexus, fere laevigatus, sat nitidus, 

 niger, capite thoraceque vix subsenescentibus, hoc ad latera indeterminate rufes- 

 ceute, elytris fuscis, basi margineque externo testaceis, antennis pedibusque testaceis : 

 elytris neque punctulatis, nee reticulatis. Long. 7, lat. 4 m.m. 



The male has the front and middle tarsi distinctly incrassate and furnished beneath 

 with short hairs, which bear minute palettes, the front claws are quite simple and 

 not elongate ; the hind tarsi have the two basal joints provided beneath with 

 swimming hairs. The female I have not seen. 



This species is very similar to Dytiscus paludosus (No. 680), but the colour is a 

 little more obscure, and the upper surface less shining, and the serial punctures of 

 the elytra are finer : the thorax is shorter behind the eyes, and its outline more 

 continuous with the elytra, and the legs are of a paler colour. It is also excessively 

 similar to Agabus japonicus, but the upper surface is less shining, the legs are 

 paler in colour, the male tarsi are more incrassate, and the anterior border of the 

 hind coxa is more arched so that the side wings of the metasternum are externally 

 more abbreviate. 



Eastern Siberia, (Transbaikal). 781. 



683. Agabus raffrayi, n. sp. — Ovalis, sat convexus, laevis, nitidus, niger, capite 

 anterius prothoracisque lateribus baud late rufescentibus, elytris fusco-rufis, basi 

 lateribusque dilutioribus, antennis tibiisque quatuor anterioribus rufis, femoribus 

 pedibusque posterioribus piceis. Long. 7h, lal. 4 m.m. 



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

 furnished beneath with short hairs which bear minute palettes, the claws are 

 simple : I think the two basal joints of the hind tarsus are provided beneath with 

 swimming hairs. 



The species is excessively similar to Dytiscus paludosus (No. 680), but is slightly 



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