Ruteline Beetles from Indo-China. 379 
The genus Peperonota, belonging to the group, has not 
enlarged mandibles, but the male has instead an extraordinary 
prolongation of the hind margin of the pronotum. In a 
second species of Didrepanephorus here recorded there is 
a strange backward-pointing spike upon the metasternum, in 
addition to the sickle-like mandibles. This is certainly also 
a feature peculiar to the male. On the other hand, I described 
in 1889 a species of the related genus Parastasia (P. mirabilis) 
in which the female is characterized by the possession of a 
sternal process absent in the male. This is also the case, in 
a less marked degree, in P. sulcipennis, Gestro. 
Both the insects here described have been discovered by 
M. R. Vitalis de Salvaza. The types are in the British 
Museum, which is indebted to this collector for so many 
interesting species from the same region. 
Didrepanephorus mucronatus, sp. 0. 
(Pl. X. fig. 2.) 
Ferrugineus, capite et mandibulis nigris; breviter ovatus, totus 
fulvo-velutinus, scutello et elytrorum partibus posticis brunneis, 
horum margine apicali pallido: ¢, mandibulis porrectis, falcatis, 
extrorsum et sursum versus arcuatis, supra dente basali lato, 
apice acuto et curvato, munitis; pronoto dorso utrinque peni- 
cillato, lateribus medio fortiter ‘angulatis, angulisque posticis 
paulo productis; metasterni medio mucro compresso oblique 
retrorsum producto munito ; pedibus robustis. 
Long. (mandibulis exclusis) 21 mm.; lat. 11 mm. 
Indo-China: Laos (Rf. Vitalis de Salvaza, May). 
I have seen only a single male specimen. ‘The most 
striking differential feature of the species is the strong pointed 
process directed obliquely backward from the middle of the 
metasternum near its hind margin. This is represented in 
D. bifaleifer (Pl. X. fig. 1) by a very slight longitudinal keel, 
which is absent in the female, so that the remarkable spike 
of the present insect is no doubt peculiar to the male. It also 
differs from D. bifaleifer in the stronger and more uniform 
curvature of the mandibles, which, although shorter in the 
type-specimen than in that of the allied form, have a larger 
tooth near the base. In addition, the eyes are rather larger, 
the prothorax is more strongly angulated on each side, and 
both the front and hind angles are sharper. The thick 
velvety pile with which the body is clothed above is much 
longer on each side of the middle of the pronotum, where 
erect tufts are formed. The scutellum and elytra are clothed 
