222 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



^. — Narrower in the prothorax (4 x 4^ mm.), the elytra hardly so 

 ■wide at the shoulders, the stria next the suture marked. 



]g;ah. — Adelaide (Rev. T. Blackburn), and western parts of 

 Victoria. 



From P. anthracinus, IMac]., to which it is closely allied, it 

 difiers in its more robust and convex form, the prothorax in the 

 (^ is much narrower in proportion to the elytra, and the elytra are 

 proportionately wider, more convex, and much more declivous to 

 the peduncle. 



I cannot think that P. snturalis, Casteln., is anything more than 

 at most a variety of P. concolor. 



Promecoderus insignis, n.sp. 



Of a bronzy olive colour, shining ; (a narrow edging of green 

 extends along the lateral channel of both elytra and prothorax) 

 underside brighter, of a greenish or bluish black ; legs black, 

 tarsi dark brown, palpi dark with apex reddish ; antennae dark 

 brown, first joint reddish-brown, three first joints glabrous, seven 

 last densely cinereo-pilose. Head smooth, large ; frontal impres- 

 sions broad, shallow, extending behind the clypeal suture (this 

 lightly marked) ; the vertex with a broad and strongly marked 

 transverse impression ; eyes prominent ; post-ocular prominences 

 small. Prothorax smooth, hardly as broad as long (4| x 4| ram.), 

 convex, truncate in front and behind, narrowed and somewhat 

 constricted behind, a strongly marked transverse impression 

 across the posterior part ; sides lightly rounded ; anterior angles 

 very little narrowed with the border not widened ; the marginal 

 border narrow, entire on the base, sinuate before the basal angles, 

 these right angles ; the median line distinctly marked. Elytra 

 smooth, oval (9| x 5| mm.), convex, rounded on the sides, widest 

 a little behind the middle (thus appearing a little narrower to the 

 shoulders) ; the marginal border narrow, a little wider behind ; 

 the sutural stria complete, distinctly marked, but rather obsolete 

 towards the apex, second rising from an impressed puncture not 

 reaching the apex. Four last ventral segments with a strong 

 round fovea on each side. Prosternum very lightly impressed 



