52 Mr. H. W. Bates on the Longicorn Coleoptera 
I found only one example of this singularly coloured species. 
It was met with at Ega, on an old stump in the forest, and was 
mistaken at first for an Erotylien, especially a species of Prio- 
telus, which is almost identical in colours with this Longicorn, 
and which was often seen in similar places when the fallen trees 
were covered by fungi. 
3. Oxathres muscosus, ni. sp. 
O. oblongus, cinereo-olivaceus, nigro conspersus: antennis, pedibus 
elytrisque longe setosis, his apice sinuato-truncatis, angulis externis 
breviter mucronatis. Long. 23-23 lin. 9. 
Head olivaceous, vertex with two dusky spots. Antenne with 
all the joints except the basal one furnished with a few longish 
and straight bristles, placed both above and beneath; they are 
blackish in colour, with the bases of the joints (from the fourth) 
pallid. Thorax rather narrow; lateral spines thick, conical, 
and placed near the hind angles; surface olivaceous, with dusky 
marks and four rather darker spots on the disk. Elytra oblong, 
apex sinuate-truncate ; sutural angle obtuse, external one pro- 
duced into a short tooth; surface clothed with long black bris- 
tles, punctured towards the base, partly in lines, ashy olivaceous, 
with numerous black spots, some of which are united near the 
middle and form an imperfect flexuous belt. Body beneath 
ashy. Legs hirsute, dingy ashy; tarsi reddish testaceous. 
2 Apical abdominal segment with the dorsal plate lanceolate, 
the point prolonged and acute; ventral plate simply truncated. 
Ega; on dead branches in the forest. 
Genus TRICHONIUS, nov. gen. 
Body oblong, setose. Antenne about twice the length of the 
body in both sexes, furnished with numerous longish sete. 
Thorax broad, widening in a curved line from the front to the 
tips of the lateral spines, which form thick conical protuberances 
situated near to the hind angles. Elytra setose, not much nar- 
rowed behind, with their tips obtusely truncated or rounded. 
Legs stout, bristly; thighs clavate ; tarsi much shorter than the 
tibiz, but the basal joint slender and elongated. Apical abdo- 
minal segment in ¢ not elongated, with tips of both dorsal and 
ventral plates broadly rounded; in @ slightly prolonged as a 
sheath to the very short ovipositor, which scarcely passes the 
tips of the elytra; its dorsal plate flattened and rounded at the 
tip, its ventral plate truncated. 
In the shape of the thorax and setose clothing of the body and 
limbs this genus resembles Probatius and Oxathres. It differs 
from both in the obtuse apices of the ventral and dorsal plates 
of the terminal abdominal segment in both sexes. There is a 
