464 Four new species of the Coleopterus Family 



ceras, but the clava is shorter and more rounded towards 

 the apex of the cavity than in P. denticulatus, the anterior 

 edge or keel is deeper, and is obsoletely corrugated. The 

 denticulations of the lower posterior edge of the excavation 

 are setigerous as in the two allied species, and the setre are 

 black. The anterior apical angle is more rounded than in 

 P, nauceras, and the base is less lengthened towards the 

 penultimate joint; the termination of the base being square 

 in P, naucerasy and oblique in P. ploiophorus. 



The head has an emarginate clypeus, with a slight chan- 

 nel running up to a papilla placed in the centre rather in 

 advance of the eyes. It is shagreened like the anterior part 

 of the prothorax, which is slightly emarginate in the centre, 

 nearly as broad as the posterior portion, and with the angu- 

 lated ridge not running transversely across the broadest part 

 as in P. denticulatus, but behind it ; whence it results that the 

 ridge is shorter. There is a deep and broad depression in 

 the middle fore-part of the hinder portion of the thorax, of 

 which the sides are elevated, broad and piceous, the poste- 

 rior part has a short channel bounded on either side by 

 an elevated ridge. The basal portion of the prothorax and 

 the elytra are polished and devoid of hair ; in P . nauceras 

 the elytra are dull and hairy. 



The castaneous margin round the central common square 

 patch on the elytra, is broad in P. ploiophorus ; while it is very 

 narrow in P. nauceras, and in the former it is beset all round 

 with thickly set pale rufous hairs projecting backwards. 



Abdomen elongate with a tuft of short straight black hair 

 on each side, near the angle, quite unlike the long threads 

 of loose curved hairs at the extremity of my specimen of P. 

 nauceras. 



The tibiae are broader and shorter in proportion than 

 in P. denticulatus, and the tarsal joints are more closely 

 set, and more indistinct in the basal ones than in that 

 species. 



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