BY THOMAS G. SLOANE. 191 



Form rather narrow, varying from very depressed — ^as in 

 P. brunnicornis, Dej., — to very convex — as in P. concolor, 

 Germ., — body pedunculate. Head small, usually transversely 

 impressed behind the eyes ; the eyes inclosed behind, the 

 post -ocular prominences often greatly developed. Clypeus 

 with a setigerous i)unctiform impression on each side ; forehead 

 often with a shallow impression on each side behind the clypeus. 

 Mandibles strong and slightly hooked at the end; the scrobe having 

 a longitudinal stria in the centre and a setigerous puncture towards 

 the front. INIaxillse narrowly and sharply hooked at the apex, 

 clothed on their inner side with a single row of closely set fine 

 hairs. Labrum transverse, truncate, (in the Tasmanian species of 

 the P. hrunnicor7iis group the labrum has a longitudinal sulcus in 

 the middle). Palpi : the last joint of both maxillary and labial 

 elongate, oval, truncate ; the penultimate joiut of the labial equal 

 to the ast in length, of the maxillary triangular, and only half 

 the length of the last. Mentum short, deeply excised in the 

 middle, normally with a short triangular median tooth or eleva- 

 tion (in P. degener, Guer., the median tooth is obsolete). Pro- 

 thorax usually a little broader than long, lightly rounded to the 

 anterior angles, narrowed behind, not lobate ; the posterior angles 

 not decidedly marked ; the marginal border very narrow, not 

 reflexed, continued on the base at each side (sometimes entire on 

 the base) ; two conspicuous marginal punctures on each side, the 

 posterior placed about one-third the length of the prothorax in 

 front of the basal angles. Elytra oval, wider than the prothorax, 

 about twice the length ; they may be either striate, or hevigate ; 

 the lateral margins with four impressions on each side, one close 

 behind the shoulders (in this the marginal channel rises), and three 

 placed towards the apex, of which the first and last are 

 punctiform, the middle one elongate. The thighs are short, and 

 thickened in the middle. The anterior tibiae not dilatate at the 

 apex, nor having the apex produced externally ; the rough spinous 

 part below hardly extending above the upper internal spur. The 

 joints of the tarsi triangular ; the posterior tarsi much more 

 elongate and narrow than the others ; usually the ^ has the first 



