BY MALCOLM CAMERON. 427 



Table of the Bornean species of the sub-genus Triacantho- 



CHTRTTS BeRNH. 



1. Anf.ero-external angles of the under surface of the head 



produced into a process distinctly visible from above. 2 



The angles not so produced. 4 



2. The process long and sharp. 3 

 The process short and blunt ; the penultimate joints of the 



antennae longer than broad. moitltoni Bernh. 



3. Larger (13--16 mm.) and more convex, sides of thorax more 



coarsely punctured ; penultimate joints of the antennte 

 moderately transverse. iinicolor Cast — (1) 



Smaller (10--11 mm.) and less convex : side of thorax less 

 coarsely punctured; penultimate joints of antennas 

 strongly transverse. gutturalis Bernh. 



4. Middle tooth well developed. 5 

 Middle tooth very small. Length 8 mm. parvidens n. sp. 



5. Legs entirely red. Length 10.5 mm. mjobergi n. sp. 

 Legs black. 6 



6. Base of thorax completely bordered. 7 



Base of thorax not completely bordered. Length 10 mm. 



dorice Heller 



7. Disc of thorax very distinctly uniformly alutaceous. Length 



il.5--13 mm. poseidon Bernh. 



Disc of thorax not or only feebly alutaceous in patches. 8 



8. Thorax feebly irregularly alutaceous. Size larger. Length 



10.5 mm. bomeensis n. sp. 



Thorax not at all alutaceous. Size smaller. Length 



9 mm. difficilis n. sp. 



PRiocHiRirs (Cephalomerur) BOROLTNOIDES n. Bp. 



Black, shining, subdepressed ; bead 4 — dentate, tbe inner 

 long, stout, parallel, conical, considerably produced beyond 

 tbe level of the apices of tbe outer, these much smaller, 

 acute, dentiform; frontal impression as long as the sulcus of 

 the vertex — (2) and but little wider than it. longer than the 

 free inner border of tbe internal born, inter-cormial border 

 truncate. Thorax very slightly transverse, the sides parallel, 

 moderately coarsely, biserially punctured, the base not 

 completely bordered, feebly alutaceous. Elytra a little longer 

 than the thorax, scarcely alutaceous, tbe sides with a row 

 of rather close punctures. Abdomen with a row of fine 

 punctures at the base and apex of each segment, except 



(1) — Becorded by Fauvel (Mitt. Nat. Hist. Mus. Hamb. xxii, 1904, 

 p. 77.). I have not seen specimens from Borneo. 



(.2) — Measured from the point where the sulcus begins to ^^^iden in 

 this and following species. 



