294 DyxASTiyiE. 



pygidmm is densely punctured, and the punctures, at least at the 

 sides, tend to coalesce tpansverselj. 



c5' . The cephalic horn is sliort and nearly straight. The anterior 

 halt' of the prothorax is scooped out and divided by two smooth 

 oblique carinse into three areas which are coarsely rugose. The 

 elevated dorsal part ends abruptly in front and is sometimes 

 slightly produced, but it never extends nearly as far as the front 

 margin. 



5 . There is a rudimentary excavation at the front margin of 

 the pronotum and two slight tubercles behind it. 



Length 21-29 mm. ; breadth 11-15 mm. 



Andaman Is. ; Buema ; Penang. 



Tyj^e in the British Museum. 



Genus HETERONYCHUS. 



Heteronychus, Bunn., Ilandh. Ent. v, 1847, p. 90; Lacord., Gen. 

 Coleopt. iii, 1850, p. 406 ; Kolhe, Ent. Nachr. 1900, p. 163. 



Type, Geotrupes arator, F. (8. Africa). 



Rawje. Africa and Southern Asia. 



Form shortly cylindrical, not very convex, smooth and shining, 

 and without armature or excavation. Clypeus tapering and 

 generally minutely bideutate in front. Mandible bluntly pro- 

 minent in front, deeply notched at the outer margin. Maxilla 

 very strong, not hairy, armed wdth three pairs of strong sharp 

 teeth. Mentum long and narrow, slightly tapering to the end. 

 All the palpi slender. Pronotum very smooth, impunctate, 

 strongly and regularly rounded at the sides and scarcely narrowed 

 to the front. Prosternum forming a free columnar process behind 

 the front coxa3. Propygidium bearing near the middle two longi- 

 tudinal tiles composed of short stridulatory ridges. Legs not long, 

 with rather broad and flat tibiae, the front ones armed with three 

 broad teeth and smaller ones between, the middle and hind tibiae 

 strongly car'nate externally, truncate and fringed with stout spines 

 at the end. 



(S . Front tarsi very short and thick, with the claw-joint enlarged 

 and the inner claw broadly dilated, bent inwards and cleft or 

 lobed. 



Key to the Species. 



1 (4) Pygidium strongly and uniformly 



punctured. 



2 (3) Punctures of the pygidium very coarse 



and conflueut Uoderes, Redt., p. 295. 



3 (2) Punctures of the pygidium separate . . annulatus, Bates, p. 295. 



4 (1) Pygidium not, or little, punctured. 



5 (8) Elytra punctate-striate. 



6 (7) Sides of the elytra evenly punctured . . subleevis, Fairm., p. 296. 



7 (0) Sides of the elj-tra almost smooth in 



the middle robitstuf!, sp. u., p. 29(5. 



8 (5) Elytra smooth sacchari, Arrow, p. 297. 



