256 Mr. C. J. Gahan on Longicorn Coleoptera 
Plocederus chloropterus of Chevrolat. Murray’s description of 
it is very complete. It will be sufficient therefore to point 
out the differences between it and other allied and very 
similar species. 
From viridipennis , Hope, and from chloropterus , Chevr., it 
is distinguished by the very close punctulation of the basal 
half or third of the elytra ; from chloropterus , Chevr., it is 
further distinguished by the oblique lines or grooves forming 
a tC crown-shaped ” impression on the disk of the prothorax. 
In P. chloropterus , Chevr., the prothorax is almost regularly 
transversely wrinkled above and the ridges are not interrupted 
by oblique impressions on the disk. The elytra, though 
more strongly punctulate towards the base, have not the 
punctures much more thickly spread on this region than 
towards the apex. 
In P. viridipennis , Hope, the sculpturing of the prothorax 
is almost exactly like that of hasalis ; the oblique lines are, 
however, somewhat more distinct and form a W-shaped 
impression on the disk. The elytra may be described as 
somewhat sparsely punctulate, with the punctures evenly 
spread over the whole surface and diminishing in size to the 
apex. The prosternal process is provided posteriorly with a 
more or less distinct median tubercle. 
It is difficult, from Hope’s short diagnosis, to identify his 
species with certainty. The characters just given are taken 
from a species from Sierra Leone which Adam White had 
labelled viridipennis , Hope, and which agrees with Hope’s 
description. 
Plocederus gabonicus , sp. n. 
Niger ; elytris metallico-viridis, fusco tinctis ; prothorace supra 
fortiter transversim rugoso, rugis anticis recte transversis, rugis 
pone medium sinuatis ; elytris subtilissime griseo-pubeseentibus, 
versus basin confertim punctulatis, versus apicem minutissime sat 
denseque punctulatis, apicibus truncatis, angulis dentatis ; an- 
tennis ( 2 ) corpore vix excedentibus, nigris (scapo badio excepto), 
articulis a quinto ad decimum apice interne denticulato-productis ; 
pedibus femoribus (basi apiceque exceptis) rufo-testaceis, tibiis 
basi nigris ; processu prosterni medio postice tuberculato. 
Long. 30, lat. 9| mm. 
Hob. Gaboon (W. Africa). 
The strong and almost quite regular transverse wrinkling 
of the prothorax uninterrupted by any oblique impressions on 
the disk, the very close punctulation of the basal part of the 
elytra, and the median tubercle to the prosternal process will 
