On Aquatic Carnivorous Coleoptera or Dytiscide. 271 
but I think the specimens indicate a distinct species, as besides being pale in 
colour, they are larger and a good deal broader, and have the hind legs more 
elongate. 
North America, (Carolina). 509. 
37. Noterus bicolor, Say. Suphis bicolor, M.C.—Ovalis, brevis, latiusculus sat 
convexus, nitidus, ferrugineus; elytris nigricantibus, crebre fortiter punctatis, 
corpore subtus nigro-rufo. Long. 22, lat. 1: m.m. 
This species scarcely differs from Suphis gibbulus (No. 38) except by the sexual 
characters, and that it generally has the elytra and under surface darker in colour. 
In the male the apical ventral segment is without evident impressions, but in the 
female it is rather deeply impressed on each side so as to appear somewhat carinate 
along the middle. 
United States, (Carolina). 508. 
38. Suphis gibbulus, Aube, Spec. p. 414.—Ovalis, brevis, latiusculus sat con- 
vexus, nitidus, ferrugineus, elytris crebre fortiter punctatis. Long. 23, lat. 
vix 13 m.m. 
In each sex the apical ventral segment is depressed on its middle portion, so 
that the sexes are difficult to distinguish, the depression however is a little greater 
in the male than it is in the female. 
North America. 507. 
39. Hydrocanthus tenuicornis, Chev. M.C.—Ovalis, sat convexus, nitidus, 
ferrugineus, crebre fortiterque punctatus. Long. 2¢ m.m., lat. 12 m.m. 
This species is very close to Suphis gibbulus (No. 38), but is more elongate 
and the punctation of the elytra is deeper. I have seen but one individual, which 
is a female, and has the apical ventral segment rather deeply impressed on the 
middle. 
Cuba, (Brussels Museum). 506. 
40. Canthydrus subsignatus, n. sp.—Ovalis, sat convexus, haud curtus, nitidus, 
castaneus ; elytris fusco-castaneis, vage testaceo-signatis, crebre fortiter punctatis ; 
prosterni processu canaliculato; coxarum laminis parcius punctatis. Long. 2%, 
lat. 1¢ m.m. 
The marks on the elytra are ill-defined; the lateral margin is yellow, as are 
also two spots on the middle of each, and some indistinct marks near the suture. 
