270 On Aquaiic Carnivorous Coleoj^tera or Dytiscidcp. 



32. Canthydrus ovatus, n. sp. — Breviter ovalis, sat convexus, nitidus, ferrugineus, 

 elytris obscurioribus, crebre fortiter punctatis. Long. 2 1, lat. 1| m.m. 



This species is intermediate between Suphis gibbulus (No. 38) and Canthydrus 

 insularis (No. 35), it is smaller and shorter than the former, and has the coxal 

 laminas more sparingly punctured ; while it is less short and rotund than 

 Canthydrus insularis, and has the antennge shorter. I have seen only one female ; 

 it has the apical ventral segment impressed on each side so as to appear distinctly 

 carinate along the middle. 



BrazD, (Santa Eita, September, 1850, Dr. SaUberg). 513. 



33. Canthydrus grossus, n. sp. — Ovalis, posterius acuminatus, convexus, nitidus, 

 testaceus, elytris sordidis, cum thorace sat crebre fortiter punctatis. Long. 4 m.m., 

 lat, 2| m.m. 



In this species the thorax is even more closely and distinctly jjunctured than are 

 the elytra. The large size I'eadily distinguishes the species from its allies. The 

 only specimen I have seen appears to be a female, and has the apical ventral seg- 

 ment simple. 



Brazil, (Pemambuco, Brussels Museum). 512. 



34. Canthydrus I'otundatus, n. sp. — Subrotuudus, convexus, testaceus, nitidus, 

 elytris sordidis, obsolete punctatis ; prosterni processu profunde canaliculato ; 

 coxarum laminis parce punctatis. Long. 1| m.m., lat. ll m.m. 



I have seen but a single individual of this minute species, its very short rotund 

 form, and the diminished punctuation readily distinguish it. 



Brazil, (Pemambuco, Brussels Museum). 511. 



35. Canthydrus insularis, n. .sp. — Brevis, rotundato-ovalis, convexus, nitidus, 

 rufo-testaceus ; elytris obscurioribus, crebre, fortiter sed baud argute punctatis. 

 Long. 2, lat. li m.m. 



The male has the apical ventral segment nearly simple. Though I have seen 

 but a single individual I have no doubt it is distinct from though very closely 

 allied to the preceding, being larger, of more rotund and convex form. 



San Domingo, (Coll. Bouvouloir). 510. 



36. Canthydrus punctipennis, n. sp. — Ovalis, brevis, latiusculiis, sat convexus, 

 nitidus, ferrugineus, elytris crebre fortiter jDunctatis. Long. 2|, lat. If m.m. 



The sexual characters appear to be the same as in Noterus bicolor (No. 37) ; 



