110 Mr. C. 0. Waterhouse on new 



acutis retrorsum directis ; elytris thorace haud angustioribus at 

 duplo longioribus, humeris obtusis, lateribus arcuatis, angulis 

 apicalibus extcrioribus bene rotuiidatis, apicibua arcuatis. Long. 

 H lin. 



Peob^enus, gen. nov. 



Mentura somewhat transverse, suddenly narrowed in front, 

 tlie extreme apex truncate ; on either side of the narrow por- 

 tion (but on a lower plane) there is a somewhat triangular 

 projection ; the ligula is not prominent, but its anterior angles 

 are produced into two delicate, subcjlindrical, slightly curved 

 projections, nearly as long as the palpi. Labial palpi short 

 and thick 5 the basal joint round, scarcely visible ; the second 

 and third equal, slightly elongate, subcylindrical. Lobe of the 

 maxilla slender, ciliated, with a distinct sharp tooth nearly on 

 a level with the basal joint of the palpus. Maxillary palpi 

 with the second joint twice as long as broad, narrowed at its 

 base ; the third joint a little shorter, a little longer than broad, 

 the apical joint one third longer than the previous one, slender, 

 a little narrowed at the apex. Mandibles very prominent, 

 completely visible from above, impressed, broad at the base, 

 narrow and pointed at the apex. Head transverse, slightly lobed 

 over the base of the antennae ; eyes prominent. Antennae 

 very long, basal joint very large ; second joint elongate, cylin- 

 drical, inserted near the apex of the basal joint ; the third to 

 eighth joints a little longer than the second, of the same form ; 

 the ninth rather shorter and broader than the previous joint, 

 the tenth scarcely transverse, the eleventh oblique truncated. 

 Thorax transverse, broader behind, scarcely narrowed in front. 

 Elytra oblong. Pygidium visible from above. Legs robust ; 

 tarsi short, the basal joints slightly dilated, strongly ciliated. 

 Pro- and mesosternum constructed as in Mystroj)s. 



This genus is closely allied to Mystrops^ from which it 

 differs in the form of the mandibles, the form of the head, the 

 basal joint of the antennse, and in the elytra nearly covering 

 the abdomen. 



I am unacquainted with Mystrops dispar from Madagascar, 

 except from description ; but I think it probable that it may 

 have to be transferred to the present genus. 



Prohcenus longicornis, sp. n. 



P. oblongus, leviter convexus, testaceus, nitidus, crebre distincte 

 piinctatus ; capite sat magno transverse, leviter convexo, antice 

 impresso, utrinque supra antennarum basin parum elevate ; oculis 

 prominentibus, nigris ; mandibulis porrectis, leviter curvatis, 

 apice acuminatis, basi supra parum concavis ; antennarum arti- 



