480 Mr.C. 0. ay Merhonscts Descriptions of new 
a marked peculiarity ; an approach to this is met with 
in Sagridola in the Lepturine. 
The following is the description with which Mr. Bates 
has furnished me :— 
** Megacelus pectinicornis, n. 8. 
‘‘Hlongatus, niger, femoribus (basi exceptis) flavo- 
testaceis ; capite exserto, angusto ; palpis articulo termi- 
nali ovato, apice obtuso; antennis brevibus articulis 
8—10 apice productis, breviter pectinatis; thorace 
elongato, antice angustato, supra ineequali bituberculato, 
polito, lateribus unispinosis; elytris oblongis, lateribus 
parallelis apice late rotundatis, supra basi politis, versus 
apicem crebre alveolato-punctatis, tricostatis ; pedibus 
robustis, femoribus compressis, elongato-ovatis, tarsis 
latis, articulis 1—2 triangularibus, equalibus. 
“9, Ventri segmentis 1—2 maxime elongatis, hoc 
apice ciliato, ceteris segmentis omnino retractis. Long. 
Lin, 16 Tin, 
“‘T venture to refer this remarkable Longicorn to the 
genus Megacelus, from the similar structure of its abdo- 
men, and its evident affinity in other respects. It differs, 
however, in its pectiniform antenne and anteriorly- 
narrowed and prolonged thorax. The anterior coxe and 
prosternum are constructed as in Dorcasomus ; the eyes 
are also similar ; but the mandibles are long, robust, and 
falcate, and the palpi much longer, and the mesosternum 
is rather broader between the haunches. ‘The antenne 
are much shorter than in either sex of D. Delegorquei. 
‘* Hab. Mount Cameroons, W. Africa ; two examples.” 
H. W. Bares. 
I propose giving a figure of this species in part viii. of 
my ‘ Aid to the Identification of Insects.’ 
Plectogaster thoracica, n. 8. 
Nigra, sat nitida, tenuissime pilosa; thorace crebre 
punctato, tuberculis quatuor depressis nitidis, glabris, 
lateribus tuberculo parvo acuto instructis, elytris dense 
punctatis, nervis nonnullis nitidis. ¢. Long. 26 lin. 
This species differs from P. pectinicornis in having the 
femora black; the head is densely and finely rugulose ; 
the thorax is rather more produced over the head (the 
lateral tubercle is smaller), the whole surface is rather 
thickly punctured, somewhat strongly in front, more 
