DE. F. LEUTHXER ON THE ODONTOLABINI. 475 



moderately convex, very finely punctured, smooth and shining, or frequently clothed 

 with fine brown hair ; front tibiae long, straight, or slightly incurved, forked at the tip 

 both on the outside and inside, finely punctured, the tip clothed with brown hair; 

 inside of the four hind legs thickly clothed with silken hair. 



Mandibles. 



1. Forma telodonta. — Mandibles as long as the head and prothorax together, mode- 

 rately curved, flattened, resembling 0. castelnaudi, the tip forked, or with three small 

 teeth, followed by a small branch projecting inwards, which is often forked ; base 

 without teeth (nineteen examples). 0. cingalensis, Parry. 



2. Forma mesodonta. — Mandibles as long as the head, strongly curved, upper side 

 channelled; four or five apical teeth, followed by the middle tooth, which projects 

 strongly downwards ; an obtuse basal tooth ; head in front narrower, canthus slightly 

 emarginate, spine behind the eyes slightly prominent ; prothorax apparently broader, 

 owing to the narrower head ; fi-ont tibise straight, or slightly curved (eight specimens). 

 0. nigritus, Deyr. 



3. Forma ampModonta. — Mandibles as long as the head, strongly curved, with three 

 or four apical teeth, an obtuse basal tooth ; prothorax broader than the head or elytra. 

 0. carinatiis (type). 



4. Forma priodonta (irregularis). — Mandibles shorter than the head, the right side 

 more strongly developed than the left, with from five to seven irregular teeth ; a small 

 triangular epistoma above the mandibles. 



Female. Black, upper side dull, underside shining. Head broad, flattened, dull, 

 the firont strongly punctured, canthus straight, narrow, mandibles coarsely granulated ; 

 prothorax long, broadest in the middle, front edge strongly emarginate on each side 

 and clothed with reddish-brown hair, the sides nearly straight in front, strongly emar- 

 ginate behind, hind margin nearly straight, with brown hair ; elytra flattened, with only 

 the middle shining ; front tibiae with two spines above the terminal fork, hind tibiae 

 but slightly curved. 



Number of specimens examined : eighty males and twenty-three females. 



Habitat. Ceylon. The British Museum also possesses specimens from Madras and 



Calcutta. 



Measurements. 



Total length, 

 millim. 

 ^ . British Museum (telodont) .... 66 

 c^ . British Museum (mesodont) .... 42 

 cJ . British Museum (amphiodont) . . 48 

 iS . British Museum (priodont) .... 39 



$ . British Museum 32 



$ . British Museum 22-5 



