2o8 Mr. C. J. Gahan on Longicorn Coleoptera 



This species resembles P. denticornis, Fabr. ; but in the 

 latter the elytra are brownish black without any reddish tint ; 

 the third and fourth joints of the antenna are each furnished 

 at their inner apex with a sharp and strong spine standing 

 out at right angles, and the remaining joints up to the tenth 

 are produced into sharp spine-like processes. P. Eminii, 

 recently described by Mr. Waterhouse, has been compared by 

 him with the present species. 



Plocederus facatus ^ Thoms. 



Thomson "was certainly in error in quoting this species as 

 the fucatus of Dejean's collection. From his description I 

 have been able to identify three specimens from the Gaboon 

 as belonging to his species, and they are very distinct from 

 the species just described. With a strongly wrinkled and 

 somewhat densely pubescent prothorax, a rather dense yel- 

 lowish-grey silky pubescence on the elytra, and a rather short 

 and stout form, the species may be easily enough recognized. 

 It is most nearly allied to P. spinicornis, Fabr., but may be 

 distinguished by the denser pubescence of the prothorax and 

 elytra. The third joint of the antenna is moreover very 

 feebly spined or almost unarmed at the apex, whereas iu 

 spinicornis this joint is distinctly spined at the apex, 



Plocederus spinicornisj Fabr. 



Lamia spinicornis, Fabr. Spec. Ins. torn. i. p. 224. 

 Cerambyx denticornis, Oliv. Ent. iv. no. 67, p. 60. 



This species, described from specimens in the Banksian 

 cabinet, has apparently been omitted from the Catalogue of 

 Gemminger and Harold. Olivier altered the name for a 

 reason — at the time perhaps valid enough, but now no longer 

 good. It is w^ell to mention that, though Olivier's descrip- 

 tion is that of Fabricius's species, his figure accompanying it 

 represents a quite different species, which appears to me to 

 be Prosphilus pilosicollis, Thoms. P. puhipennis^ White, is 

 merely a slight variety of P. spinicornis^ Fabr. 



Plocederus consocius. 



Ceramhyx consocim, Pasc. (^Pachydissus in Cat. Geram. and Harold). 



This species is very nearly related to P. Iiumeralis, White, 

 and the latter again to P. j^)tdestris, White. In all three the 

 prothorax is irregularly transversely wrinkled above and 

 armed on each side with a rather short and somewhat blunt 



