38 1 STAPHYLiNiDiE. [Raj'loderus. 



than thorax, rather strongly and thickly punctured; legs testaceous. L. 4 

 mm. 



Male with the seventh ventral segment of hind body deeply emarginate, 

 the emargination being feebly bisinuate with the central lobe hardly 

 marked. 



In dung, vogetal)le refuse, at roots of grass, in marshy places, &c. ; common and 

 widely distributed from the Midlands soutliwards ; rarer furtlier north ; Bold mentions 

 it as a rare hill insect only met with on the western borders of the Northumberland and 

 Durham district ; Scotland, Lowlands, rare, Forth and Tay districts. 



ANCVROPKORUS, Kraatz {OdliepUlus, Eey). 



This genus comprises about a dozen species from Europe, I^orth 

 America, and Central Asia ; they are rather peculiar in appearance owing 

 to their very long depressed elytra, which are much broader than the 

 thorax ; the tarsi are all 3-jointed ; our two British species are very local, 

 and are found at the sides of streams, or in damp moss in or near running 

 streams and waterfalls ; when disturbed they fold themselves into an S 

 and remain motionless ; the sexual characters are unimportant, the seventh 

 ventral segment being slightly rounded or subemarginate at apex in male 

 and feebly bisinuate in female. 



I. Form smaller and more slender; antennas not much longer 



than head and thorax, with joints 4-6 subtransverse .... A. OMALINUS, JEr. 



II. Form larger and more robust; antennas much longer than 



head and thorax, with joints 4-6 longer than broad .... A. aureus, Fauv. 



A. omalinus, Er. (vemistulus, Rosh., 2^'^'^fposih(s, Eey, procendu.% 

 Epp.) . Elongate, subparallel, rather depressed, black, more or less shining, 

 with the elytra more or less brown or pitchy-red ; head subtriangular, 

 almost as broad as thorax, with two deep furrows ; antennae mode- 

 rately long, blackish with base lighter, slightly thickened towards apex ; 

 thorax subtransverse, much narrower than elytra, finely and hardly visibly 

 punctured with two furrows on disc divided by a smooth central line, 

 which forms Avith the base, which is somewhat raised, an anchor-shaped 

 elevation ; elytra much longer than broad, about three times as long as 

 thorax, finely and tliickly punctured ; hind body finely and not thickly 

 punctured ; legs reddish-testaceous. L. 3 mm. 



On the sides of streams, &c., in damp moss ; very local ; Sawley, Lancashire (first 

 taken as British in this locality by Dr. Power) ; Bewdley, banks of Severn ; Clifton ; 

 Scarborough ; Northumberland district, banks of Irthing and Wansbeck ; Scotland, 

 common, Solway and probably other districts ; Ireland, Bray, co. Wicklow. 



A. aureus, Fauv. {longipennis, Wat., &c., nee Fairm.). Larger and 

 more robust than the preceding, aud evidently duller, with the antennae 

 much longer, and stouter, with the joints more elongate ; the elytra are 

 a little more distinctly punctured, and the legs are, as a rule, of a clearer 

 testaceous colour ; this species difiers from 0. lonr/ijyennis, Fairm., to which 

 it has usually been referred, l)y being a little larger and broader, with the 



