NEW BRITTSH SPECIES, ETC., IN 1864. 47 



There avouM appear to be some frrounds for suspicion 

 about S. hrunnipes, as Dr. Sebaum {loc. cit.), after his 

 description, adds a note that he cannot allow Erichson's 

 diagnosis as to the hinder angles of the thorax being some- 

 what blunter, and more rounded, and the elytra longer, than 

 in S. doi'salis. 



3. CoLYMBETES {Ihjhius) SEX-DENTATUS, Schiodte ; G. R. 



Crotch, Cat. Brit. Col.; id. Zool. 8999 (1864); 

 F. Archer, Jun., Zool. 8973 (1864). 



Mr. Crotch states this insect has been hitherto confounded 

 with C. obscuvus, Marsh., from which, and from all other 

 members of the genus, it is at once distinguished by the 

 dentate claws of the intermediate tarsi of the male. 



Mr. Crotch has obtained numerous specimens at Cam- 

 bridge, and found others in several collections. 



Mr. Archer records the capture of one specimen (named, 

 as he informs me, by Mr. Crotch) in a brook running to the 

 shore at Little Brighton, near Liverpool. 



4. Agabus sexualis, Reiche; G. R. Crotch, Cat. Brit. 



Col. ; id. Zool. 8999 (1864). 

 *' Peterhead, Aberdeen." Mr. Crotch, in addition to this 

 locality, states that he is informed by Dr. Schaum that this 

 is a variety of A. SoUeri, Aube, a species abundant in 

 Iceland. 



5. AuTALiA PUNCTicoLLis, Sharp, Proc. Ent. Soc. Lond. 



3 Oct. 1864, Zool. 9335 (1864), deHcrihecl 

 Taken by Mr. D. Sharp last August at Rannoch, Perth- 

 shire ; there is also a specimen in Mr. Janson's Collection, 

 taken some years since in Scotland by the late H. Squire. 

 With the facies of A. rivulaTis, but the size of A. im- 



