On Aquatic Carnivorous Coleoptera or Dytiscide. 393 
cox, except their hind margin, bear very coarse punctures, as do also the latera 
parts of the metasternum ; the ventral segments are also rather coarsely punctured. 
Madagascar. 61. 
376. Herophydrus verticalis, n. sp.—Latior, parum elongatus, convexus, piceus, 
sat nitidus, prothorace transversim in medio elytrisque lateribus obscure pallido- 
signatis, antennis pedibusque fusco-testaceis; thorace elytrisque crebre fortiter 
sequaliter punctatis ; clypeo conspicue marginato, margine in medio parum interrupto. 
Long. 43, lat. 3. m.m. 
This species is remarkable for its appearance, which is quite that of a 
Hyphydrus, its tibiee and tarsi are slender, and the small size of the later suggest it 
as approaching Hydrovatus, but so far as I have been able to examine, it undoubtedly 
is allied to Herophydrus spadiceus and Hyphydrus guineensis, Aubé, (No. 378). I 
have seen but one individual which is very fragile and mutilated; and Ido not know its 
sex. It is much broader and a little longer than Hyphydrus guineensis, and its head 
and thorax are rather more regularly and strongly punctured ; the head has a trans- 
verse pale mark quite at the vertex ; the thorax is broadly pale at the anterior 
angles, and this pallid colour extends as an excessively obscure band across the 
middle of the thorax ; the elytra have a pale humeral mark, and their apical portion 
is marked with several irregular indistinct, longitudinal pale marks ; these marks 
ave ill defined and probably very variable. 
Interior of M adagascar. 1167. 
377. Herophydrus spadiceus, n. sp.—Sat angustus, convexus, nitidus, piceus, 
elytris rufo-signatis, crebre fortiter punctatus, antennis pedibusque rufis; clypeo 
utriique marginato, thoracis angulis posterioribus obtusis. Long. 43, lat. 2? m.m. 
Very similar to H. heros but a good deal smaller, and readily distinguished by the 
very distinct margin of the clypeus, which however is interrupted in the middle. 
The red marks on the elytra are smaller and more numerous, the punctuation is not 
quite so coarse, and the front legs are rather more slender. 
Madagascar. 62. 
378. Hyphydrus guineensis, Aubé, M.C.—-Sat angustus, convexus, nitidus, piceus, 
vel piceo-ferrugineus ; dense fortiter punctatus ; antennis pedibusque rufis ; clypeo 
utrinque marginato, thoracis angulis posterioribus obtusis. Long. 4}, m.m, lat. 
2¢ m.m. 
This species is very closely allied to Hydroporus spadiceus, but is rather smaller, 
is a little more densely punctured, and the elytra are without any distinct markings. 
Senegal, Arabia, Egypt, Algeria, Corsica. 63. 
