394 On Aquatic Carnivorous Coleoptera or DytiscidcB. 



379. Hero2:)hydrus obscurus, n. sp. — Ovalis, convexus, fere sine pubescentia, 

 ferrugineus, thorace crebre distincte, elytris crebre fortiter punctatis ; clypei margine 

 medio breviter interrupto. Long, ih, lat. 21 m.ni. 



Mas, nitidus. 



Fern., opaca. 



This species is very close to Heroj:)hydrus oscillator and is just possibly a variety 

 of it, but the upper surface is nearly unicolorous, and the punctuation of the elytra 

 is rather denser. 



South Africa, (Cape Town). 187. 



380. Heroi)hydrus oscillator, n. sp. — Ovalis, convexus, nitidus, sine pubescentia, 

 ferrugineus, prothoracis inarginibus anterioribus et posterioribiis nigricantibus, 

 elytris testaceis siguaturis nigris, antennis pedibusque testaceis ; prothorace crebre 

 distincte, elytris crebre fortiter punctatis ; clypei margine medio breviter interrupto. 

 Long. 4^^, lat. 2f m.m. 



The markings on the elytra are the suture and a long line near it black, with 

 some shorter black lines outside these, all more or less confluent and confused. 

 The punctures on the elytra are of one size except close to the base where the 

 punctures are more distinct, and a few smaller ones are mixed with them. This 

 species is about intermediate in form between Hjdroporus musicus (No, 300), and 

 Dytiscus parallelogrammus, (No. 416). 



South Africa. (Atloo Lush, Caflraria). 18G. 



I. 35.— Genus CCELAMBUS. 



Ligula on inner face of elytra free and abrupt ; terminal joint of front tarsus not 

 very short in comparison with the third joint, although frequently concealed by the 

 deep fissure of the latter ; humeral area of epipleura limited behind by a well 

 marked line : mesosternal fork not connected with intercoxal process of metaster- 

 num. 



The numerous species* are usually pale in colour, with dark markings on the 



* In addition to tliose the characters of which are now given, the following should also be referred to 

 this genus: — Hydroporus Cleopatra;, Peyr. (No. 1351), near No. 390; Syria. — Hydroporus discoideus, Leo. 

 (No. 13G3), near No. 399; North America. — Hydroporus fractilinea, Solsky, (No. 1371); Turkestan. — 

 Hydroponis infacetus, Clk. (No. 1383), near No. -101 ; Mexico. — Hydroporus masculinus Crotch, (No. 

 1397), near No. 403; North America. — Hydroporus pectoralis, Motsch. (No. 1412); Siberia. — 

 Hydroporus sellatus, Lee. (No. 1429), near No. 401 ; North America. — -Hydroporus tauricns Motsch. 

 (No. 1439), near No. 420; Russia. — Hydroporus unguicularis. Crotch, (No. 1447), near No. 403 ; North 

 America. — Hygrotus impressifons, Motsch. (No. 1458); California. The generic position of the 

 following is doubtful Init probably is near, if not actually in, Coelambtis : Hydroporus inquinatus Boh. 

 (No 138G);Caffraria. 



