Coleoptera from India, Japan, and Africa. 429 
This species, by its green elytra, is at once distinguished 
from all its allies. It is nearest to M. absurdwm, Newm. 
The head below has a ridge within each eye; these two 
ridges converge posteriorly. The prosternal process is 
narrow, convex and parallel. The third joint of the 
antenne is concave above, and more strongly so below ; 
the basal joint is concave below, both sparingly scabrous ; 
the ninth, tenth, and eleventh joints are dull and longi- 
tudinally furrowed. 
Hab. §.E. India. B. M. 
CERAMBYCIDA. 
PLECTOGASTER, N. g. 
@. Head not much narrowed behind the eyes, which 
are strongly emarginate. Antenne short and thick; a 
little more removed from the eyes than in Dorcasomus ; 
the first joint rather flattened, elongate-triangular ; the 
second very small; the third to tenth with the mner 
apical angle strongly and acutely produced ; the eleventh 
joint irregularly fusiform. Thorax impressed at the 
base, and strongly so before the front, constricted 
anteriorly, the front margin raised and produced over 
the back of the head; with four obtuse swellings on the 
back, a tubercle about the middle of the side, and with a 
lateral oblique ridge before the posterior angle and before 
the anterior angle. Elytra somewhat flattened dorsally, 
slightly narrowed towards the apex, which is obtuse ; 
the shoulders are very obtuse; each elytron has three 
fine raised lines. The prosternal process is very narrow 
and arched. The mesosternum is moderately broad. 
The metasternum is very large, but not so long as broad. 
The first abdominal segment is very large, and as long 
as the metasternum; the second segment is nearly 
as long, fringed at the apex; the following segments are 
retracted, laminated, and densely pubescent. The 
femora are very compressed ; the tarsi narrow. 
I propose this genus for a most remarkable insect in 
Mr. H. W. Bates’s collection from the Camaroons. Mr. 
Bates referred it to the genus Megacelus, a genus which 
was only known to him from having seen it some years 
ago in this Museum collection. I think, however, that 
the structure of the antenne and thorax are so different 
that it is desirable to separate it generically. The 
elevated and produced front margin of the thorax is 
