440 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



punctatus ; subtus fortiter punctatus, coxarum punctis densis. Long. 41, lat. vix 

 2i 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 mo to indicate a distinct species, for they are rather 

 smaller and narrower, the punctuation of the upper surface is rather coarser, and the 

 front tibiae 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 upjjer surface are more developed. 



North America. 274. 



505. Hydroporus scrutator, n. sp. — Ovalis, dense subtiliter pubescens, opacus, 

 obsolete punctatus, ferruginous, prothorace anterius et posterius elytrisque fuscis, 

 his signaturis indistinctis rufis, sti'ia suturali minus distincta ; prothorace sat crasse 

 marginato ; coxis posterioribus fortiter fere dense punctatis ; antennis extrorsum 

 fuscis. Long. 4, lat. 2i m.m. 



I do not know the sex of the only two individuals I have seen ; they have the 

 front tarsi rather slender. 



Ega 1. 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 foi'titer 

 punctatus. Long, o'i, lat. 2i 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, loete 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 fortissimo punctatis. Long. 4, lat. vix. 2" m.m. 



