192 CARABID.E. BEMBIDIUM. 



also, but the latter are usually dull brassy green, or obscurely 

 bronzed. Head with a deep rough oblong fovea on each side, 

 and a transverse impression and ridge in front, palpi obscure 

 pitchy, antennse fuscous black, with the basal joint alone red. 

 Thorax somewhat quadrate, sides very little rounded from below 

 the anterior angles to behind the middle, then straight, and 

 forming, with the base, a right angle, which is very slightly 

 elevated, the disk rather depressed, having a deep central furrow 

 terminating in front in a small transverse impression, the base 

 very much depressed and furnished with a very large fovea close 

 to each angle, and extending more than half-way to the dorsal 

 furrow, the space between the two being finely strigose longitu- 

 dinally. Elytra oblong-ovate, broad, rather depressed, moderately 

 striated, stria? distinctly punctured, interstices flat, the third 

 stria with two deeper impressions, one about the middle, the 

 other nearer the apex ; underside bronzed, femora pitchy black, 

 tibiae and tarsi testaceous. Length 2f lines. 



The variety Peryphus atroc&ruleus, Steph., is smaller and 

 usually blue-black ; its thorax is rather more narrowed behind, 

 its elytra are less dilated and the stria? more slender and the punc- 

 tuation finer ; but none of these variations are to be relied upon 

 as constant, as they more or less blend into one another in a 

 long series of individuals. M. Jacquelin-Duval, to whom I 

 communicated some of my varieties, has connected atroc&ruleus, 

 the variety above mentioned, with cyanescens, Wesmael, and by 

 means of other links, with B. cteruleum, Dejean, and has, more- 

 over, united them all with Elaphrus fasciolatus, Dufts. (B.fascio- 

 latum, Sturm) as the type, but as that particular form has never 

 been found in Britain, I have retained the name tibiale for the 

 present species. 



This insect is extremely abundant on the gravelly beaches of 

 rivers in mountainous districts, especially in the north of En- 

 gland and Wales, Scotland and Ireland. 



24. B. prasinum : obscure viridi-aneum ; thorace brevi, subqua- 

 drato, angulis posticis prominulis ; elytris oblongis } di- 

 stincte striatis, striis integris impunctatis; antennarum 

 articulo primo plus minus rufo ; pedibus nigris. 



Elaphrus prasinus, Dufts. Faun. 2. 201. 



Bembidium prasinum, Sturm, D. F. 6. 146. Dej. Spec. 5. 129 ; 

 Icon. 4. 394. pi. 215. Jacq.-Duv. Ann. Soc. Ent. 10. 104. 

 B. olivaceum, Gyll. Ins. Suec. 4. 408. 

 Peryphus olivaceus, Steph. Maud. 2. 16, et Manual, p. 56. 

 P. Leachii, (Spence) Steph. Mand. 2. 16, et Manual, p. 55. 



