O.Cl/J)ada.] STAPHYLINID.!;!. 27 



]\Iale with the vcntriil plate of seventh abdominal segment produced iii 

 the middle in a hlunt and wide angle. 



In dead liavos, fiiiiui, canion, &c. ; occasionally bj' swooping; New Krompton 

 (Surrey), Hit^ligate, Mickloliam ; North Devon, Marnstaple; Sherwood Fonst ; 

 Studley Royal, Kipon ; Harilopool; Scalby (Yorkshire); Northtunborland district, 

 very rare, in fungi, Gosft)rth Woods and Wooler, October; Scotland rare, Forth, 

 Clyde, and Solway districts (Cheviot Hills, Eccles, Eahnuto, &e.). 



This species is larger than any of the other British members of the 

 genus, and is different in colour : from all the others except O. Ion;/ /pes it 

 differs in having the posterior tarsi more elongate with the first joint 

 shorter than the three following united : from 0. luwjipes its much larger 

 and broader size and longer penultimate joints of the anteimse will serve 

 to separate it. 



O. long-ipes, ]\Iuls. et Eey, Smaller and narrower than the preced- 

 ing, pitchy black, with the elytra reddish brown (the region round 

 scutellum and the postero-external angles being usually darker) ; antennae 

 moderate Avith the second and third joints about equal, 4-6 gradually 

 a little less longer than broad, 7-10 about as long as broad, eleventh 

 very long ; thorax much as in the preceding species ; elytra longer than 

 thorax, strongly sinuate near postero-external angles, finely, thickly, and 

 rugosely punctured ; hind body strongly narrowed and setose behind, 

 very finely shagreened ; legs testaceous, posterior tarsi elongate with 

 first joint shorter than the three following united. L. 3^-3f mm. 



Male with the dorsal plate of seventh segment of hind body produced 

 in rather a strong angle in the middle of posterior margin. 



Scotland, Forth district ; a single specimen taken at Aberlady : the species is rare 

 in France near Lyons and Beaujolais in trunks of old trees in company with Formica 

 fuliginosa. 



O. lividipennis, jNEann. (Juteipennis, Er.) Of a dull pitchy black or 

 brownish colour, very finely and thickly pubescent, with the thorax 

 sometimes lighter than head, and the elytra except the region around 

 scutellum and the postero-external angles testaceous ; the apex of the 

 segments of the hind body is also lighter ; antenna rather long, fuscous 

 with basal joint testaceous, and one or two following reddish brown, with 

 joints 4-10 gradually a little thicker and shorter but none of them 

 transverse, the last joint long sharply narrowed at apex; thorax 

 transverse, narrowed in front ; sides sometimes lighter than disc ; el3'tra 

 plainly longer than thorax, with base strongly sinuate near posterior 

 angles, very closely and finely and rugosely punctured; hind body 

 plainly and gradually narrowed to apex, very finely shagreened ; leo-s 

 rather long, testaceous, posterior tarsi with the first joint elongate, equal 

 to the three following united : the colour is somewhat variable, and 

 several species were founded by Stephens on its differences. L. 4 mm. 



]\Iale with the ventral [jlate of seventh segment oi hind body produced 

 in middle of apical margin. 



