480 DE. F. LEUTIWER ON THE ODONTOLABINI. 



with large scattered punctures on the sides behind the eyes ; mandibles shorter than 

 the head, coarsely punctured, strongly curved, with a series of four or five apical teeth, 

 separated by a gap from a small bifid tooth at the base ; prothorax as long as the 

 head, and broader, crescent-shaped, front edge deeply emarginate on each side, front 

 angles acute, the sides rounded behind ; hinder edge emarginate in the middle ; 

 elytra oval, strongly convex, smooth and shining ; front tibiae broad in front, with two 

 spines above the terminal fork. 



Measurements. 



Habitat. Siam (Cambodia), collected by M. Mouhot. Three males and one female 

 (Westwood's types) in Pariy's collection ; one paii', male and female, in the British 

 Museum. 



It appears that both Major Parry and Prof. Westwood have mistaken a small male 

 for a female, as is sho-svn by their measurements, and also by their plates (pi. x. fig. 6, 

 pi. xi. fig. 3 a). The mandibles of the type in Major Parry's collection are difi'ereutly 

 formed on the left side, and it agrees with the description and figure in the small and 

 inconspicuous quadrate clypeus, which is wanting in the female. If Prof. Westwood 

 had known the real female, he would certainly have mentioned the characteristic form 

 of the female mandibles. 



2. Heterochthbs andamanensis, Westw. (Plate LXXXIV. figs. 9-11, S ; fig. 12, ? .) 

 Heterochthes andamanensis, Westw. Trans. Ent. Soc. Lond. 1874, p. 359, pi. iii. fig. 2, cJ (good figure) . 



Male. Much larger than H. hrachypterus ; head comparatively shorter, and difiiering 

 in the various forms of the male mandibles ; entirely black, or dark nut-brown ; man- 

 dibles and prothorax dull, elytra shining, head quadrangular, front margin often with 

 two projections in the middle ; canthus oblique, narrow ; spine behind the eyes gene- 

 rally distinctly visible ; strongly punctured above and behind the eyes ; prothorax 

 broader than the head and elytra, front edge more emarginate on the sides ; the 

 sides rounded; elytra broadly oval, flattened, shining; front tibiae long, with three or 

 four spines above the terminal fork. 



Mandibles. 



1. Forma telodonta. — Mandibles as long as the head and prothorax, flattened, with 

 a small rudimentary tooth behind the incui-ved tip (fig. 9). 



2. Forma mesodonta. — Mandibles as long as the head, much compressed, with two 



