480 DR. F. LEUTHNER 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 tibie broad in front, with two 
spines above the terminal fork. 
Measurements. 
Total length. Head. Mandibles. Prothorax. Elytra. 
millim. millim, millim. millim, millim. 
3. Type (telodont).... 36 6-5 by 11 12 5:0 by 10 12 by 10 
do. (amphiodont) .... 22:5 5:10\,, 8 4 40, 85 10 ,, 8:5 
od. (gynoides)........ 20 40 ,, 5:5 3 40, 8 10,, 8 
Eee Sena OM OTe 21:5 AD eS 4:5 4-5. ,, 9:5 125, 10 
Habitat. Siam (Cambodia), collected by M. Mouhot. Three males and one female 
(Westwood’s types) in Parry’s collection; one pair, 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 shown by their measurements, and also by their plates (pl. x. fig. 6, 
pl. xi. fig. 3a). The mandibles of the type in Major Parry’s collection are differently 
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. HETEROCHTHES ANDAMANENSIS, Westw. (Plate LX XXIV. figs. 9-11, 4; fig. 12,2.) 
Heterochthes andamanensis, Westw. Trans. Ent. Soc. Lond. 1874, p. 359, pl. ii. fig. 2, f (good figure). 
Male. Much larger than H. brachypterus; head comparatively shorter, and differing 
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 tibie 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 incurved tip (fig. 9). 
2. Forma mesodonta.—Mandibles as long as the head, much compressed, with two 
