440 On Aquatic Carnivorous Coleoptera or Dytiscide. 
punctatus; subtus fortiter punctatus, coxarum punctis densis. Long. 43, lat. vix 
2+ m.m. 
I have seen only two individuals of this species, they are males in bad condition 
and have the front tarsi not very broad, their claws short. Though very close to 
H. undulatus, they appear to me to indicate a distinct species, for they are rather 
smaller and narrower, the punctuation of the upper surface is rather coarser, and the 
front tibize and tarsi are narrower than in the corresponding sex of H. undulatus ; 
the elytra have no distinct markings. It is more similar in colour to H. lynceus 
(No. 506), but it is very much more elongate, and the punctuation and pubescence 
of the upper surface are more developed. 
North America. 274. 
505. Hydroporus scrutator, n. sp.—Ovalis, dense subtiliter pubescens, opacus, 
obsolete punctatus, ferrugineus, prothorace anterius et posterius elytrisque fuscis, 
his signaturis indistinctis rufis, stria suturali minus distincta ; prothorace sat crasse 
marginato; coxis posterioribus fortiter fere dense punctatis ; antennis extrorsum 
fuscis. Long. 4, lat. 23 m.m. 
I do not know the sex of the only two individuals I have seen; they have the 
front tarsi rather slender. 
Ega? Although the specimens are labelled Ega, I believe them to be North American. 295. 
506. Hydroporus lynceus, n. sp.—Ovalis, sat latus, brevior, evidenter pubescens, 
rufus, elytris fuscis vage rufo-signatis, prothorace in medio vix obscuriore, antennis 
tenuibus extrorsum fuscis, prothorace sat tenuiter marginato; subtus fortiter 
punctatus. Long. 34, lat. 2 m.m. 
The male has the front and middle tarsi a good deal broader than in the female, 
the front claws short ; the upper surface in the male is a little shining and is distinctly 
and closely, but not densely nor coarsely, punctured ; in the female it is quite dull 
and the punctuation is very obsolete. 
The species is of much shorter form than H. undulatus (No. 503), and the tarsi 
of each sex are more slender. 
North America, (Mus. Murray). 1144. 
507. Hydroporus peltatus, n. sp.—Ovalis, sat latus, convexus, postice acuminatus, 
brevissime pubescens, subnitidus, leete rufo-testaceus, elytris nigricantibus, conspicue 
testaceo-signatis, prothorace sat tenuiter marginato, lateribus oblique rectis, nullo- 
modo rotundatis; elytris crebre sat fortiter punctatis, coxis posterioribus 
abdomineque basi utrinque fortissime punctatis. Long. 4, lat. vix. 22m.m. 
