394 On Aquatic Carnivorous Coleoptera or Dytiscide. 
379. Herophydrus obscurus, n. sp.—Ovalis, convexus, fere sine pubescentia, 
ferrugincus, thorace crebre distincte, elytris crebre fortiter punctatis ; clypel margine 
medio breviter interrupto. Long. 43, lat. 27 m.m. 
Mas, nitidus. 
Fem., opaca. 
This species is very close to Herophydrus 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. Herophydrus oscillator, n. sp.—Ovalis, convexus, nitidus, sine pubescentia, 
ferrugineus, prothoracis marginibus anterioribus et posterioribus nigricantibus, 
elytris testaceis signaturis nigris, antennis pedibusque testaceis ; prothorace crebre 
distincte, elytris crebre fortiter punctatis ; clypei margine medio breviter interrupto. 
Long. 42, lat. 2% 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 Hydroporus musicus (No, 390), and 
Dytiscus parallelogrammus, (No. 416). 
South Africa. (Adoo bush, Caffraria). 186. 
I. 35.—Genus CH/LAMBUS. 
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 
* Tn addition to those the characters of which are now given, the following should also be referred to 
this genus :—Hydroporus Cleopatre, Peyr. (No. 1351), near No. 390; Syria.—Hydroporus discoideus, Lec. 
(No. 1363), near No. 399; North America.—Hydroporus fractilinea, Solsky, (No. 1371); Turkestan.— 
Hydroporus infacetus, Clk (No. 1383), near No. 401; Mexico.—Hydroporus masculinus Crotch, (No. 
1397), near No. 403; North IA eek ae et pectoralis, Motsch. (No. 1412); Siberia.— 
Hydroporus sellatus, Lec. (No. 1429), near No. 401; North America.—Hydroporus tauricus 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 but probably is near, if not actually in, Coelambus : Hydroporus inquinatus Boh. 
(No 1386) ; Caffraria. 
