TRIGONOSTOMUM. 289 



$ . In addition to the differences already enumerated, the 

 female is more thinly setose and more shining than the male. 



Length, 7-8 mm. ; breadth, 3'5-4'5 mm. 



MADE AS : Pondicherry (Perrottet). 



Type in the Paris Museum ; co-type (female) in the British 

 Museum. 



Genus TRIGONOSTOMUM. 



Trigonostomwn, Burin., Handb. Ent. iv, 1, 1844, p. 466. 

 TYPE, Triyonostomum mucoreum, Burm. (Madagascar). 



Range. Madagascar, Malay Archipelago, Ceylon. 



Rather narrowly elongate, with the head small, the eves very 

 prominent, and the clypeal margin rounded and strongly reflexed. 

 Antennae 10-jointed. Labrum (fig. 59 a) rather short, serrated at 

 the sides and produced to a sharp point in the middle. Mandible 

 blunt at the tip. Maxilla armed with four teeth at the end; the 

 palpi moderately slender, the last joint elongate- oval. Mentum 

 longer than broad, almost parallel-sided, deeply notched behind the 

 palpi, the front margin narrowed and sharply bidentate ; palpi 

 short, with the last joint oval. Legs slender, the front tibia armed 

 with two sharp teeth and a feeble upper one ; claws very unequal, 

 the longer one cleft on the front and middle feet. 



J . The body is distinctly arched beneath, and the club of the 

 antenna is rather long. 



The females of this genus appear to be more rarely found than 

 the males. 



Only one Indian species is known. 



310. Trigonostonmm ursus. (Plate V, fig. 1.) 



Adoretus ursus, Arrow, Ann. Mag. Nat. Hist. (8) viii, 1911, 



p. 365. 

 Trigonostomum ursus, Ohaus, Deutsche Ent. Zeits. 1912, p. 411. 



Yellowish, with the inner and outer 

 margins of the elytra rather darker, and the 

 head and pronotum dark brown, suffused 

 with a metallic lustre. 



Elongate in shape and somewhat shining, 

 but clothed with rather coarse greyish setae, 

 which are dense upon the scutellum and 

 moderately close upon the sides and ends of 

 the elytra and the pygidium, but elsewhere 

 rather scanty. The elytra bear also a few 

 longer erect hairs placed far apart upon the 

 costae. The head is not large, but the eyes 

 Fig. 63. Trigono- are prominent, the clypeus rugose, with the 

 stomum ursus, tf . margin semicircular and very strongly re- 

 flexed, and the forehead very coarsely punc- 

 tured. The pronotum is very shining, very strongly punctured, 



