Erotyliche.] clavicornia, 183 



The three British genera may be distinguished as follows : — 



I. Tarsi distinctly 5-jointed Dacne, Latr. {Engls, Pajk.) 



II. Tarsi apparently i-joiiiteil (the fourth joint being 

 very small and connate with fifth). 

 i. Thorax margined at base; form oblong . . . Triplax, Pay^. 

 ii. Thorax not margined at base ; form ovate . . Ctetotriplax, Crotch. 



{Triioma, ¥.). 



DACNZ:, Latreille (Enr/is, Paykull). 



This genus contains rather more than a dozen species from Europe, 

 South Africa, North America, Japan, &c. ; they may he known by their 

 5-jointed tarsi ; two of these occur in Britain. 



I. Thorax red D. hitmeralis, F. 



II. Thorax pitchy-black D. bufifeons, F. 



The larva of J). r;(^j-0H.9 is described and figured by Westwood (Classif., Vol. I., 

 p. 147, Figs. 11, 13); it is narrow, somewhat cylindrical and scaly, with six short 

 legs, and two strong short cerci at the extremity of the body, which is sparingly 

 clothed with scattered hairs, except on head ; it is found in boleti iu company with 

 the perfect insect. 



I>. humeralis, F. Oblong, black, shining, with the head, thorax, 

 antenna?, and legs red, and a spot at each shoulder reddish-yellow ; head 

 rather broad, antenna? rather short, with joints 4-8 rounded and trans- 

 verse, 9-11 forming a distinct club; thorax broader than long, convex, 

 finely and rather diffusely punctured ; elytra finely punctured in rows ; 

 legs rather stout, tibite angularly dilated at apex. L. 2|-3 mm. 



In boleti on beech and elm trees ; rare ; Dulwich ; Westerham and Eastry, Kent ; 

 Shecrness ; Wicken Fen, Cambridge ; Hunstanton, Norfolk ; Suftblk ; Bristol ; 

 Llangollen ; Bretby Wood, near P^epton, Burton-on-Trent ; Needwood, Staffordshire. 



D. rufifrons, F. Very like the preceding, but easily known by its 

 colour, which is black or pitchy-black, with the head, antenna?, and legs 

 ferruginous, and a more or less distinct spot at shoulder reddish or 

 reddish-yellow ; it is also on the average rather smaller, but there 

 appears to be very little difference of structure or sculpture between the 

 species : immature examples are of a lighter colour, and are sometimes 

 entirely testaceous or reddish-testaceous. L. 2|-2|- mm. 



In fungoid growth on trees ; locally common ; London and Southern districts, 

 generally distributed ; South Wales ; Cambridgeshire; Salford Priors ; Bretby Wood, 

 near Repton ; Hunstanton, Norfolk ; Scarborough; neither of the species appears to 

 ojcur in the Northern counties of England or in Scotland. 



'&* 



TRIPIiAX, Paykull. 



Upwards of fifty or sixty species are contained in this genus ; they are 

 widely distributed, but a larger proportion occur iu temperate and even 

 cold countries than is usually the case with genera belonging to the 

 family ; thirteen are found in Europe, but six of these are assigned in 

 the catalogue of Heyden, Pteitter, and Weise to the genus Ischyrus, Lac, 

 which is included by them under Triplax ; the geims Isclnjms, according 



