18 CLAVicORNiA. [Agathtdium. 



thorax about as broad as elytra, broadest behind middle, narrowed in 

 front, exceedingly finely punctured ; elytra inipunctate with a distinct 

 sutural stria reaching to about the middle ; legs reddish-brown. L. 

 1|- 2 mm. 



Male with the left mandible sometimes considerably developed, 

 female with all the tarsi 4-jointed. 



In vegetable refuse, rotten wood, at the damp bottoms of old woodstacks, &c. ; not 

 uncommon, but somewhat local. Darenth Wood, Shirley, Croydon, Caterham, &c. ; 

 Glanvilles Wootlou ; Knowle ; Needwood ; Repton ; Ripon ; Lincoln ; Liverpool and 

 Manchester district ; Northumberland district, not rare, in fungi growing on decaying 

 trees ; Scotland, rare, Solway and Forth districts. 



The colour and impunctate elytra will easily distinguish this species 

 from its allies. 



A, g-lobosum, Muls. {convexuni, Sharp). This species is allied 

 to A. inarghiatum, but at once distinguished by the presence of a sutural 

 stria on the elytra which reaches from apex to about middle, and by 

 the female tarsi ; the antennae also are unicolorous red, whereas in 

 A. marginatum the first two joints of the club are almost always dark ; 

 it is also allied to A. 7-otundatum, but is larger than that species and less 

 pointed at apex, and may further be easily distinguished by the colour 

 of the antennae which in A. rotundatum always have the club dark, 

 L. If-ll-mm. 



In the male the left mandible is sometimes very much developed ; 

 in the female the tarsi are 5- 4- 4-jointed. 



In dead leaves, moss, &c. ; rare; Shirley, Esher, Bexley, Chatham, Barenth, 

 Hainault, Birch Wood, Loughton, Miokleham, Highgate (Champion, Power, &c.) ; 

 Hopwas Wood, Tamworth (Hlatch); Drinkwater Park, Manchester ; Repton ; Scot- 

 land, rare, Lowlands, Highlands, Solway, Tay, and Dee districts (Sharp). 



A. rotundatum, Gyll. One of the smallest, if not the smallest, of 

 our species ; deep black, shining, with the extreme margins of thorax, 

 and apex of elytra obscurely pitchy ; form globose but rather longer and 

 not quite as broad as in other species ; head finely punctured, antennae 

 reddish with club dark (often lighter at apex) ; thorax fully as broad 

 as elytra, very finely punctured, the punctuation being scarcely visible 

 except at sides; elytra with a sutural stria reaching to about middle with 

 punctuation, as in thorax, visible at sides ; legs reddish or reddish- 

 brown. L. 1-|— 1| mm. 



Male with the left mandible often produced or furnished with a horn ; 

 female with tarsi 5- 4- 4-jointed. 



In fungoid growth on dead trees, under bark, &c. ; rare in England ; Esher, Cater- 

 hrtm, Darenth Wood, Cobham Park, Chatham; Cannock Chase ; Sherwood Forest ; 

 Wallasey; Bowden Park, Manehpster ; Northumberland district; Scotland, under 

 b:ii k, not rare, Solway, Tay, Dee, Sutherland, and probably other districts. 



This species is closely allied to A. marginatum, but is easily dis- 



