both sexes, clypeal suture wanting or very faint, sides of clypeus 
scarcely (or very feebly) sinuous, mandibles visible in repose, 
labrum not prominent, front marginal furrow of prothorax not ~ 
angulated hindward in the middle, organs of  stridulation 
wanting; claws of male simple. 
The following is a tabulated statement of the distinctive 
characters of the Semanoptert known to me. S. (Phileurus) 
subcostatus, Cast., might be almost any Semanopterus but is 
probably Adelaide, Hope. 8S. subequalis, Hope, is probably the 
insect for which I propose the new generic name Asemantus. I 
have seen no Semanopterus that agrees with the description of 
S. depressus, Hope, or depressiusculus, Macl. S. convexiusculus 
might possibly be identical with my S. punctiventris, but as the 
brief description of it implies that the hind corners of the pro- 
thorax are not excised, I think its identity very improbable. 
A. Sides of prothorax not (or scarcely) sinuate nor 
strongly incurved in front of base. 
B. Pygidium (at any rate near its base) opaque 
through the presence of fine close strigosity. 
C. Punctures of the pygidium near its apex 
quite isolated and very sparse ... Adelaide, Hope. 
CC. The whole surface of the pygidium opaque 
through close strigosity in the female, 
rather closely and coarsely punctured 
near apex in the male meridianus, Blackb. 
BB. Pygidium not opaque through close strigosity longicollis, Blackb. 
AA. Sides of prothorax not or scarcely sinuate, but 
strongly rounded, and strongly incurved in 
front of base. 
Bb. Pygidium pilose. 
C. Sculpture of pygidium concentric in male ... concentricus, Blackb. 
CC. Sculpture of pygidium not concentric in 
male om Ae: ... angustatus, Blackb. 
BB. Pygidium not pilose ee = ... minor, Blackb. 
AAA. Hind corners of prothorax (viewed from 
above) strongly excised. 
B. Hind excavation of prothorax very lightly 
impressed. 
C. The elytral costz quite feebly developed. 
D. Puncturation of prothorax much finer and 
sparser near the hind excavation than 
on the sides carinatus, Blackb. 
DD. Puncturation of prothorax evenly dis- 
tributed and comparatively strong ... persimilis, Blackb. 
CC. The elytral costz very elongate and well 
elevated ... tricostatus, Blackb. 
BB. Hind excavation of prothorax “deep and 
elongate-foveiform. 
C. Anterior ventral segments not punctured in 
the middle... rectangulus, Blackb. 
CC, Anterior ventral segments punctured i in the 
middle baa af ah ... distributus, Blackb. 
S. meridianus, sp. nov. Convexus; nitidus; piceus vel rufescens, 
