364 On Aquatic Carmvorous Coleoptera or Dytiscide. 
307. Bidessus dilutus, n. sp.—Clypeo antice submarginato ; oblongo-ovalis, 
brevis, minus latus, rufo-testaceus, elytris sordide testaceis obsoleteque parce fusco- 
punctatis ; coxis posterioribus abdominisque segmentis basalibus utrinque fortiter 
sat profunde punctatis. Long. 14, lat. 1 m.m. 
Closely allied to Bidessus perforatus but a good deal smaller and rather narrower, 
and with the punctuation of the under surface less developed. 
Siam, (Bangkok). 107. 
308. Hydroporus pulicarius, Aubé, Spec. p. 494.—Oblongo-ovalis, subtiliter 
pubescens, supra opacus, testaceus, elytris obscurioribus obsolete punctatis; coxis 
posterioribus medio sparsim sat fortiter sed minus profunde punctatis. Long. 14, 
lat. 1 m.m. 
This species is variable, and it is possible I have mixed more than one under the 
name; but I do not see any characters sufficient to distinguish the two Brazilian 
from the two North American individuals I have seen. 
America, North and South, (Florida ; Santa Rita, Brazil). 143. 
309. Hydroporus caraibus, Chev., M.C.—Oblongo-ovalis, subtiliter pubescens, supra 
opacus, testaceus, elytris obscurioribus, externe indistincte fusco-maculatis, obsolete 
punctatis ; coxis posterioribus medio sparsim obsolete punctatis. Long. 2, lat. 1 m.m. 
Closely allied to Hydroporus pulicarius, but rather larger and more elongate, 
and with the coxee more obsoletely punctured. 
Cuba. 144. 
310. Hydroporus chilensis, Sol., M.C.—Oblongo-ovalis, sat latus, subtus niger, 
antennis pedibusque testaceis, capite thoraceque fusco-testaceis, hoc lateribus 
dilutioribus, elytris testaceis, fusco signatis, dense sat fortiter punctatis; coxis 
posterioribus fortiter punctatis. Long. 2, lat. 1} m.m. 
The male is more shining than the female, and has the punctuation of the upper 
surface deeper and more distinct, and the front and middle tarsi are slightly broader. 
Chili. 101. 
311. Hydroporus flavofasciatus, Steinheil, Atti. Soc. Ital. Sci. Nat. XII, p. 249.— 
Oblongo-ovalis, minus latus, sine pubescentia, sat nitidus, subtus niger, antennis 
pedibusque sordide testaceis, supra fusco-niger, prothoracis lateribus obscure 
dilutioribus, elytris fascia lata sub-basali plus minusve interrupta testacea ; thorace 
elytrisque dense profunde punctatis ; coxis posterioribus fortiter punctatis. Long. 
1#, lat. 1 m.m. 
