532 Mr. C. O. Waterhouse on 
the labial palpi is enlarged, globose, and without any 
impression. The mandibles in Horonotus are described 
as being obtusely bidentate at the apex; in both genera 
I find a slight impression at the apex, but I think it can 
scarcely be said to be bidentate. The cilia to the edge 
of the truncature of the posterior tibie are extremely 
fine, their length in the largest specimens of Dipelicus 
(21 lin.) not exceeding thatina small Horonotus (10 ln.) 
1. Dipelicus Cantori, Hope. (Pl. XXVII. fig. 2, ¢). 
(Trans. Hint...S0c.1V.. 45 pl. 1.219. 1,9:). 
g. Oblong-ovate, convex, pitchy-black or fuscous ; 
underside paler. Head triangular in front, surmounted by 
a gradually attenuating and but little curved horn, 
rising to a level with the back of the thorax. Thorax 
convex, with the sides rounded, thickly and irregularly 
punctured, with gently reflexed margin ; anterior angles 
not prominent ; posterior angles rounded ; a deep, some- 
what circular, glossy excavation occupies rather more 
than half the width of the thorax, and extends to the an- 
terior margin; the posterior margin produced in the 
middle into a lobe, which is raised above the level of the 
elytra; it projects over the scutellum, where there is a 
small incision, and has a flat summit, somewhat thickly 
and deeply punctured; the fore part of the lobe armed 
with two projecting tubercles ; above each of the anterior 
angles, at the front of the excavation, is a broad flat horn, 
acuminated above the middle. Scutellum punctured. 
Elytra very little enlarged posteriorly, with four shghtly 
irregular oblique striz formed of double rows of punc- 
tures, and one sutural punctate stria; mterstices strongly 
and irregularly punctured ; shoulders and suture smooth. 
Propygidium produced triangularly over the pygidium, 
with the central part occupied by the stridulating organs ; 
pygidium granulose. Underside very httle punctured. 
Anterior tibiz tridentate, rugosely punctured on the out- 
side. Posterior tibie in the form of an elongate triangle, 
with two ciliated carinee on the outside, the basal one small ; 
apex semicircular, furnished with about thirty very small 
blunt teeth on the outer edge, with a very short hair or 
bristle between each; spurs elongate, lamelliform. 
Anterior tarsi long, slender ; posterior, with the basal joint 
very large, with a small notch above, near the apex. 
Long. 21 lnes. 
