BY MALCOLM CAMERON. 435 



longer than the tliorax, . distinctly longer than bi'oad, longi- 

 tudinally impressed by the scutellum and at the shoulderB. 

 finely, very sparingly irregularly punctured. Abdomen 

 moderately finely and moderately closely punctured, coriaceous, 

 pubescence long, yellow, sparing. 

 Lio Matu, 16 specimens. 



OSORIUS BICORNITTUS n. sp. 



Differs only from the preceding in the smaller size (7 mm.), 

 testaceous more slender antennae, the penultimate joints of 

 which are not longer than broad, the fine distinct and close 

 striation of the vertex, less transverse thorax and lighter red- 

 dish-testaceous legs. From 0. hicornis Heller by the distinct 

 striation of the vertex, longer penultimate antennal joints 

 and much more distinctly punctured abdomen. 



Baram district, 8 specimens. 



OSORTUS BIDENTATUS n. sp. 



Very near the preceding but differs as follows : the frontal 

 horns are stouter and rather shorter, the vertex on either side 

 is not striate but presents only a few fine elongate punctures, 

 the antennae and legs are pitchy black, the penultimate joints 

 of the former slightly transverse. I^ength 6.5 mm. 



Baram district, a single specimen. 



OSORTTTS PLANIFRONS n. sp. 



Black, shining; front of head feebly longitudinally strigose. 

 at the sides sparingly, asperately, punctured ; supra-ocular 

 region finely strigose ; vertex smooth in the middle, at the 

 sides with some fine interrupted strisp ; occipital region finely 

 punctured (especially towards sides), coriaceous. Thorax at 

 the sides in front finely strigose, the rest of the surface very 

 finely and sparingly punctured. Elytra finely, irregularly 

 wrinkled, not punctate. Abdomen finely and sparingly 

 punctured. Antennae pitchy-testaceous. Legs brownish-red. 

 Length 8.5 mm. Build of 0. rugifrons Er. ; differs in the 

 much less strongly sculptured head, broader and differently 

 sculptured thorax, impunctate elytra and much less punctured 

 abdomen. Head moderately shining, very finely wrinkled and 

 coriaceous on the declivous front, at the sides with a few 

 asperate punctures, between the antennal tubercles scarcely 



