364 On Aquatic Carnivorous Coleoptera or DytiscidcB. 



307. Bidessus dilutus, n. sp. — CljiJeo antice submarginato ; oblon;^o-ovalis, 

 brevis, minus latus, rufo-testaceus, elytris sordide testaceis obsoleteque parce fusco- 

 puactatis ; coxis posterioribus abdominisque segmentis basalibus utrinque fortiter 

 sat profunde punctatis. Long. If, 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, Aube, 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, if, 

 lat. 1 m.m. 



This species is variable, and it is possible I have mixed more than one under the 

 name ; but 1 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 fuscomaculatis, obsolete 

 punctatis; coxis posterioribus medio sparsim obsolete jjunctatis. Long. 2, lat. 1 m.m. 



Closely allied to Hydroporus pulicarius, but rather larger and more elongate, 

 and with the coxae more obsoletely punctured. 



Cuba. 144. 



310. Hydroporus chilensis, Sol., M.C. — Oblongo-ovalis, sat latus, subtus niger, 

 aiitennis pedibusque testaceis, capite thoraceque fusco-testaceis, hoc lateribus 

 dilutioribus, elytris testaceis, fusco signatis, dense sat fortiter punctatis; coxis 

 posterioribus fortiter punctatis. Long. 2, lat. li 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. 

 If, lat. 1 m.m. 



