264 On Aquatic Carnivorous Coleoiotrra or Dytiscidce. 



]. 5.— Genus SYNCHORTUS. 

 Anterior tibipe with indefinite outer apical angle, with elongate curved spur; 

 antennas slender ; hind tibia) broad and flattened. 



The six species* occur in Madagascar and tropical Africa. 



14. Synchortus simplex, n. sp. — Ovalis, sat convexus, castaneo-testaceus, nitidus, 

 fere Isevis, elytris punctis 25aucis subtilissiniis. Long. 2l, lat. 1| m.m. 



The single male individual, which is all I have seen of the species, has the basal 

 joints of the front and middle tarsi dilated, the latter furnished underneath with a 

 very large cupule. 



Africa, (Gaboon). 516. 



15. Synchortus aciculatus, n. sp. — Ovalis, sat convexus, castaneo-testaceus, 

 nitidus, Isevis, sed elytris versus apicem et exterius punctis imbricatis sat approxi- 

 matis. Long.' 2s, lat. ll m.m. 



The only individual I have seen is a female, and differs from Synchortus simplex 

 only by the tarsi and the elytral sculpture, so that I believe the two are probably 

 the sexes of one species. 



Africa, (Gaboon). 517. 



IG. Synchortus sparsus, n. sp. — Ovalis, sat convexus, castaneo-testaceus, nitidus, 

 Isevis, sed elytris apicem versus et exterius punctis parvis sub-asperatis, baud 

 numerosis. Long. 3s, lat. ll m.m. 



The single female I have seen of this species differs from Synchortus aciculatus, 

 by its rather larger size, and the much smaller punctures on the elytra. 



Africa, (Gaboon). 518. 



17. Synchortus duphcatus, n. sp. — Ovalis, sat convexus, castaneus, nitidus, laevis, 

 elytris punctis paucis subtilissimis. Long. 3^, lat. 2 m.m. 



I have seen only males of this species, they are extremely similar to Synchortus 

 simplex but are twice the size. 



Madagascar. 519. 



18. Hydrocanthus asperatus, Fairm. Ann. Soc. Fr. 18G3 p. 199.— Ovalis, sat 



* The following also belongs to Synchortus :—Noterus imbricatus, King, (No. 1,498, hiij. op.), near 

 No. 18; Eastern Africa. 



