530 TRANSACTIONS OF THE 



ber. The body is slightly larger than in that species. It ap- 

 pears to be rare. 



[This is perhaps E. cicafricosus Lee. — Leg.] 



2. E. RUSCARius. — This species I described in the Trans. 

 Amer. Philos. Sec, with a mark of doubt, as the E. riparius 

 Fabr., but having recently compared it more accurately with nu- 

 merous European specimens, I think it may, with propriety, con- 

 stitute a distinct, but certainly very closely allied species. In 

 comparison with the riparius, it is rather more robust, of a darker 

 color, more deeply sculptured, as well on the thorax as on the 

 elytra, and the discoidal impressions are somewhat larger and 

 more obvious. 



In these characters my specimens all agree, and I possess more 

 or less mutilated specimens from Pennsylvania, Mississippi, Ar- 

 kansaw, Missouri and the Rocky Mountains. I therefore have 

 ventured to separate it as a distinct species. 



NOTIOPIIILUS Dumer. 



1. N. SEMISTRIATUS, Say. — Closely allied to i\^. aqnaiicus F., 

 and hif/uttatus F., partaking of the characters of both. Dejean 

 states that it " ne differe peut-etre pas de I'une des esp(5ces 

 d'Europe," but he does not inform us which of the species ; in- 

 deed they are all so closely [418] allied, that considerable exam- 

 ination is required to detect permanent differences. The elytral 

 puncture is small, and like that of aquaticus, placed nearer the 

 base than that of the hifjuttafus, but the striae like those of the 

 latter, are not obsolete towards the tip; the four basal joints of 

 the antennae are rufous, &c. 



2. N. PORRECTUS Say. — N. scmistriatm, var. h, Say. Trans. 

 Amer. Philos. Soc. On close examination I am convinced that 

 this deserves to rank as a separate species. In comparison with 

 either of the species above mentioned, the thorax is much more 

 contracted behind, and the labrum is more advanced. The feet 

 are entirely rufous, even including the thighs. The head is 

 larger than that of the semutriafus, and the striae are not so deep- 

 ly impressed, but the impressed point of the elytra is similarly 

 situated, though perhaps a little further back. The length is 

 much the same. The color is tinged with violaceous. 



[Previously described as Elaphrus seneus Ilerbst. — Lec] 



[Vol. IV. 



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