400 On Aquatic Carnworous Coleoptera or Dytiscide. 
397. Coelambus fumatus, n, sp—Ovalis, angustulus, testaceus, abdomine pectoreque 
nigricantibus, prothorace basi elytrisque infuscatis, his dense eequaliter subtiliter 
punctatis, stria punctorum impressa distincta; coxis posterioribus fere crebre 
punctatis. Long. 3%, lat. 2 m.m. 
The only individual I have seen is a female, it is extremely closely allied to 
Hydroporus lutescens (No. 398), but isa good deal smaller, the punctures on the 
coxa are not quite so close, and the tarsi are much smaller than in the individual 
described of that species. 
North America, (United States). 216. 
398. Hydroporus lutescens, Lec., M.C.—Ovalis, angustulus, elongatus, testaceus, 
abdomine pectoreque nigricantibus, prothorace basi elytrisque infuscatis, his dense 
equaliter subtiliter punctatis, stria punctorum impressa distincta ; coxis posteriori- 
bus crebre punctatis. Long. 4, lat. 2 m.m. 
This species is smaller than H. nubilus (No. 403), and more finely and closely 
punctured : I am not sure as to the sex of the only individual I have seen, the claws 
of the front tarsi being equal though the tarsi are rather broad ; the shape of the 
front and middle tarsi is however quite different from what it is in either sex of 
Hydroporus nubilus. 
The determination of the name is not certainly correct, as I have seen no typical 
specimen of this species. 
California, (San Francisco). 215. 
399. Hydroporus patruelis, Lec., M.C.—Ovalis, sat elongatus, sine pubescentia, 
sat nitidus, testaceus, pectore abdomineque nigris, elytris apicem versus vage infus- 
catis, prothorace basi obscuriore ; elytris minus fortiter, basi minus crebre sub- 
ineequaliter, apice fere dense punctatis ; coxis posterioribus crebre punctatis. Long 
AL levi, Ott inna, 
Mas, tarsis anterioribus fortiter dilatatis, unguiculo interno crassiore. 
Very closely allied to Hydroporus nubilus (No. 403), but less elongate with the 
male front tarsi rather broader and shorter, and the colour and sculpture not quite 
similar. 
According to Crotch, H. discoideus, Lec. (Proc. Ac. Phil. 1855. p. 299), isa male 
of this species. 
North America, (United States). 214, 
400. Hydroporus suturalis, Lec., M.C.—Ovalis, sine pubescentia, nitidus, testaceus, 
abdomine pectoreque nigricantibus, prothorace basi et in medio infuscato, elytris 
