396 On Aquatic Carnivorous Coleoptera or Dytiscide. 
383. Hydroporus hydropicus, Jec., M.C.—Brevis, convexus, sat latus, sine 
pubescentia, ferrugineus, prothorace basi apiceque elytrisque fuscis, his signaturis 
vagis pallidioribus ; elytris dense fortiter inzequaliter punctatis; corpore subtus 
dense fortiterque punctato. Long. 3, lat. 2 mm. 
This species is very like Dytiscus ineequalis, (No. 381), but the punctuation of the 
elytra is denser and more uneven, consisting on the basal portion of coarse and 
fine punctures mixed together ; the species is however readily distinguished by the 
dilated tarsi of the male. The female I have not seen; according to Crotch it is 
opaque. 
California, (San Diego’. 177. 
384. Hydroporus farctus, Lec., M.C.—Subrotundatus, convexus, opacus, sine 
pubescentia, ferrugineus; prothorace dense subtilissime punctato; elytris dense 
subtiliter reticulatis, punctis adspersis parvis ; pectore dense sat subtiliter rugoso- 
punctato ; abdomine haud punctato sed alutaceo, opaco. Long. 28, lat. 14 m.m. 
I have seen of this species only a typical individual transmitted to me by Leconte, 
and which has lost its head; according to Crotch the clypeus is not margined, the 
species may be easily recognized by its rotund form and peculiar sculpture. The 
individual I have examined has the front and middle tarsi, short and rather broad, 
but I am in doubt as to its sex. 
North America, (Massachusetts, New Jersey). 179. 
385. Coelambus discedens, n.sp.—Ovalis, convexus, nitidus, subtilissime pubescens, 
brunneo-ferrugineus, prothoracis marginibus elytrisque signaturis vagis pallidioribus ; 
elytris crebre fortiter punctatis, punctis ad apicem obsoletis ; pectore abdominisque 
lateribus basi grosse punctatis. Long. 32, lat. 2 m.m. 
Antenne slender and elongate. Thorax rather sparingly punctured about the 
middle, but more closely at the margins. Elytra at the shoulders and base with 
a large irregular pale mark and another near the extremity; their punctuation is 
rather coarse and not dense, at the apex the punctures are nearly wanting; the 
elytra bear a sparing, very fine pubescence. The sternum and coxe and the sides 
of the abdomen at the base with excessively coarse deep punctures. 
The only individual I have seen, has the three basal joints of the front tarsi 
elongate, but scarcely or not at all dilated ; I am in doubt as to its sex. I am not 
sure that it is rightly placed in Ceelambus. 
China, (Kiu Kiang, found by Mr. George Lewis). 180. 
