258 Mr. C. J. Gahan on Longicorn Coleoptera 
This species resembles P denticornis , F abr. ; but in the 
latter the elytra are brownish black without any reddish tint ; 
the third and fourth joints of the antennae 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 fucatus, 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 antennae is moreover very 
feebly spined or almost unarmed at the apex, whereas in 
spinicornis this joint is distinctly spined at the apex. 
Plocederus spinicornis , Fabr. 
Lamia spinicornis , Fabr. Spec. Ins. tom. 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 well 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. pubipennis , White, is 
merely a slight variety of P. spinicornis , Fabr. 
Plocederus consocius. 
Cerambyx consocius, Pasc. ( Pachydissus in Cat. Gemm. and Harold). 
This species is very nearly related to P. burner alis 7 White, 
and the latter again to P. pedestris , White. In all three the 
prothorax is irregularly transversely wrinkled above and 
armed on each side with a rather short and somewhat blunt 
