Oil Aquatic Carnivorous Coleoptcra or Di/tiacidce. 465 



marginibus anguste ferrugineis, elytris nigro-fuscis, guttis sat numerosis testaceis, 

 pedibus rufis, antennis fusco-testaceis, basi testaceo ; elytris crebrius subtiliter sed 

 evideiiter punctatis ; coxis posterioribus crebrius sat fortiter punctatis ; abdomine 

 dense sed subobsolete punctate, fere opaco. Long. 3|, lat. 2 m.m. 



This species resembles Hyphydrus pubescens (No. 568) but the elytra have yellow- 

 spots which almost form a transverse band at the base and in front of the middle, 

 and there are other such spots near the apex at the sides, and the ventral seo-ments 

 are densely punctured ; the third joint of the front tarsus is quite small. I am 

 not able to see any sexual characters. 



Corsica, Sardinia. 409. 



580. Hydroporus decipiens. Sharp, Ann. Soc. Belg. XV, p. 113. — Ovalis, evidenter 

 pubescens, sat nitidus, niger, elytris fusco-nigris ad basin signaturis testaceis, pedibus 

 rufis, antennis fusco-testaceis, basi testaceo; elytris crebrius subtiliter sed evidenter 

 punctatis; coxis posterioribus crebrius sat fortiter punctatis; abdomine dense sed 

 subobsolete punctate, fere opaco. Long. 4, lat. 2i m.m. 



Closely allied to Hydroporus analis but more elongate and with the colour of 

 the upper surface less variegate, the testaceous markings of the elytra being 

 limited to their base ; the third joint of the front tarsus is very small ; by this the 

 species may be distinguished from Dj^tiscus planus (No. 575) to which it has a 

 great similarity ; the dense sculpture of the ventral segments distinguishes it from 

 Hyphydrus pubescens (No. 568). I have seen but three individuals, and notice no 

 sexual characters. 



Spain, (Guadarrama, Monchique). 410. 



581. Hydroporus venator, n. sp. — Ovalis, sat convoxus, subtilissime pubescens, 

 subopacus, niger, pedibus sordide rufis, antennis fusco-riifis, basi rufo ; elytris 

 fuscis, basi indistincte rufescente, omnium dense subtilissime punctatis ; coxis 

 posterioribus dense subtiliter punctatis ; abdomine subtiliter baud dense punctato, 

 sub-nitido. Long. Sh, lat. 2 m.m. 



This species resembles Hyphydrus pubescens (No. 568), but may be distinguished 

 at a glance by the extremely fine punctuation of the elytra ; in this character it 

 resembles Dytiscus marginatus (No. 582), but the smaller size, more obscure 

 colour, and less densely punctured undersurface will not allow it to be mistaken 

 for a variety of that species : the punctuation on the two basal ventral segments 

 at the sides is here comparatively coarse and distinct, while in D. marginatus it is 

 obsolete. Accoi'ding to the few specimens before me, the red or yellow marks on 

 the basal portions of the wing-cases show a good deal of variation in the extent of 

 their development, they consist of two or three irregular dashes or spots, with a 



