203 SERUICORN1A. [CV. 



O. bidentatus, 01. Oblong, convex, very scantily pubescent, 

 pitchy black ; antennae ferruginous ; thorax convex, broader than long, 

 produced on anterior margin, with sides and base finely bordered, 

 closely and finely, but distinctly and not rugosely punctured, posterior 

 angles obtuse ; elytra as broad and twice as long as thorax, regularly 

 and distinctly punctured ; legs ferruginous. L. 2| mm. 



Male with the clypeus bidentate at apex, and with the thorax sinuate 

 at apex on anterior margin, and furnished on each side of the sinuation 

 with a distinct strong tooth. 



In boleti on old trees ; also in decayed stumps ; rather local, but not uncommon ; 

 London district, common ; New Forest ; Olanvilles Wootton ; Devon ; Somerset ; 

 Worcester j Salford Priors ; Cmnock Chase ; Cambridge ; Repton ; Sherwood Forest; 

 Nocton, near Lincoln; Scarborough; Northumberland and Durham district; Scot- 

 laud, local in Polypori, Clyde, Tay, and Moray districts ; it probably occurs not 

 uncommonly in Ireland. 



C. alni, Gyll. (betulce, Zett.). Elongate, shining, rather depressed 

 on disc, with very scanty pubescence, almost glabrous, of a dark pitchy 

 brown colour, often inclining to castaneous ; antennae ferruginous, with 

 the club darker ; thorax as long as, or a little longer than, broad, with 

 sides slightly rounded and rather finely, but very distinctly margined, 

 posterior angles obtuse, but well marked, upper surface closely but 

 distinctly punctured, with traces of a central channel often apparent; 

 the front part of the thorax is often lighter than the rest of the body ; 

 elytra rather long, two and a half times as long as thorax, usually with 

 a lighter patch at shoulders and another behind middle, distinctly and 

 regularly and not very closely punctured ; legs pitchy red or ferruginous 

 with the femora rather darker. L. 2-2f mm. 



In boleti on old stumps, &c. ; occasionally by sweeping ; as a rule rare, but not 

 uncommon in a few localities ; London district, Durenth, Ha\vkhur.-t, Caterlmm, 

 Rcigate ; New Forest; Mount Edgecnmhe Park, Plymouth; Quy Fen, Cambridge, 

 bred by Dr. Power ; Littlington ; Cannock Chase ; Needwood Forest ; Dunham 

 Park, Manchester, on decayed oak ; Scotland, very rare, Tay and Dee district* 

 (Ranndch, Ac.). 



C. nitidus, Herbst. (Eridaulus nitidus, Thorns.). A small short 

 and very convex species, shining, almost glabrous, of a pitchy brown 

 colour, inclining to castaneous; head very finely punctured, antennas 

 red with the club dark ; thorax a little broader than long, with anterior 

 angles acute and somewhat thickened, and the sides and base finely 

 margined, posterior angles rounded, upper surface finely but not very 

 thickly punctured with traces of a smooth central line ; elytra as broad 

 and twice as long as thorax, rather coarsely and shallowly punctured, 

 and with an intermixture of fine punctuation ; legs testaceous. 

 L. li-lf mm. 



Male with the clypeus emarginate at apex, and produced on each side 

 in a small tooth. 



In boleti, also in old stumps, fallen boughs, &o. ; locally common ; Chatham, Rich- 



