404 Mr. C. O. Waterhouse on new Genera 
angustato, marginibus reflexis ; elytris capite thoraceque paulo 
longioribus, leevibus ; antennarum articulis quatuor basalibus nu- 
dis, rufescentibus. Long. 52 lin., lat. 2 lin. 
The general colour is pitchy; the base of the antenne and 
the parts of the mouth are reddish, the apex of the mandibles 
black. The head is large, impunctate, with a slightly im- 
pressed fovea on the forehead. The thorax is a little broader 
than the head, one quarter broader than long, impunctate, 
truncate in front and behind, the anterior angles nearly right 
angles; the sides in front very slightly rounded, behind the 
middle very strongly sinuated, thus making the thorax much 
narrower behind than in front; the posterior angles are very 
slightly diverging, scarcely acute. The elytra are a little 
broader than the thorax at its broadest part, a little longer than 
the head and thorax taken together, gently convex, depressed 
on the back, impunctate and without strie. Anterior tibie 
somewhat strongly flexuous, the internal incision very strong, 
and tooth very acute. Antenne as long as the thorax and 
head (without the mandibles), stout; the basal joint large, the 
second joint about half the size, the third and fourth a trifle 
longer, the fifth to tenth becoming a little broader and slightly 
transverse ; the eleventh elongate, with the apex rounded.. 
Hab. Madagascar. B.M. 
LAMELLICORNIA. 
Hybosoride. 
ARHOTANYPUS, gen. nov. 
Mentum quadrate, slightly rounded at the base, the anterior 
angles obliquely truncate ; labium only slightly visible at the 
sides, on account of the angles of the mentum being truncate. 
Labial palpi very stout; the penultimate joint small, as long 
as broad; the apical joint large, ovate, scarcely truncate at the 
apex. Lobes of the maxille membranous, thickly clothed 
with stiff hair. Maxillary palpi with the apical joint four 
times as long as the preceding joint, subfusiform, with the apex 
very slightly truncate. Labrum transverse. Mandibles stout, 
much curved, with the apex acute; these with the labrum 
visible from above. Antennze composed of eleven (?) joints ; 
the first joint large, stout; the second nearly globular; the 
third nearly as long as the first, but comparatively slender, 
subcylindrical; the fourth, fifth, and sixth shorter, the sixth 
obliquely truncate at the apex; the seventh transverse, nar- 
rowed at its base; the eighth very short, and almost con- 
founded with the first joint of the club; the ninth, tenth, and 
