On Aquatic Carnivorous Colcoptera or Dytiscidce. 393 



coxse, except their hind niai-gin, bear very coarse punctures, as do also the latera 

 parts of the metasternum ; the ventral segments are also rather coarsely punctured. 



Madagascar. Gl. 



376. Herophydrus verticalis, n. sp. — Latior, parum elongatus, convexus, piceus, 

 sat nitidus, prothorace transversim in medio elytrisque lateribus obscure pallido- 

 signatis, antennis pedibasque 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 tibice 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, Aube, (No. 378). I 

 have seen but one individual which is very fragile and mutilated ; and I do not know its 

 sex. It is much broader and a little longer than Hyphydrus guineensis, audits 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 

 are ill defined and probably very variable. 



Interior of Madagascar. 11G7. 



377. Herophydrus spadiceus, n. sp.— Sat angustu.s, convexus, nitidus, piceus, 

 elytris rufo-signalis, crebre fortiter punctatus, antennis pedibusque rufis ; clypeo 

 utriuque marginato, thoracis angulis posterioribus obtusis. Long, i}, lat. 2if 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, A.ube, M.C. — Satangustus, convexus, nitidus, piceus, 

 vel piceo-ferrugineus ; dense fortiter punctatus ; antennis pedibusque rufis ; clypeo 

 utrinque marginato, thoracis angulis posterioribus obtusis. Long, il, m.m, lat. 



2f 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. G-3. 



