48 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



to warrant being regarded as even a variety); var. /'. lucidicollis, 

 Casteln., = P. ohlongus, Casteln. 



I have specimens of a small Promecoderus, from the Namoi 

 River, which is so closely allied to P. lucidicollis, Casteln., that I 

 cannot find characters to separate them. Had I been able to 

 maintain P. lucidicollis as a good species, I should still have 

 regarded the Namoi form as entitled to rank as a variety ; I now 

 have to include it under P. concolor, and propose for it the name 

 var. namoyensis ; the following is a description : — 



P. namoyensis, $. bronzed black, shining, undersurface black 

 with a metallic tinge, legs piceoas black, tarsi, palpi and 1st joint 

 of antennae piceous. Head smooth, with a broad shallow im- 

 pressioQ across vertex behind the eyes ; eyes prominent, inclosed 

 buhind ; post-ocular prominences weak. Prothorax smooth, sub- 

 convex, a little flattened on the disc, about as long as broad 

 (3|-x3^ mm), truncate in front and behind; sides I'ounded, 

 somewhat dilatate in middle, narrowed behind ; marginal border 

 narrow, not crossing middle of base ; median line lightly im- 

 pressed. Elytra oval (6-|^ x 4 mm.), subconvex, a little flattened 

 on the disc, smooth, with the stria next the suture lightly marked- 



o. More parallel ; the prothorax and elytra more convex ; the 

 elytral striae more distinctly marked. 



Length 11|, breadth 4 mm. 



Hah. — 'New South Wales ; Narrabri (Musson), Gunnedah 

 (Sloane). 



The ^ diff'ers from P. lucidicollis, Casteln., in having the pro- 

 thorax and elytra more depressed ; the $ has, however, almost 

 exactly the same facies. Both sexes are duller coloured, and 

 have the elytral striae more noticeable than P. hccidicollis ; the 

 marginal border does not cross the middle of the base as it does, 

 with rare exceptions, in that species ; the transverse impression 

 behind the eyes is a noticeable feature in the present variety, but 

 is wanting in P. lucidicollis. The tarsi and the fovere of the 

 ventral segments are similar in both. 



