DR. F. LEUTHNER ON THE ODONTOLABINI. 479 
(3) HereRocuTHEs. 
(Erepos, different; 60, elevation.) 
Heterochthes, Westwood, Trans. Ent. Soc. Lond. (8) ii. p. 17 (1864). 
Male. Head large, broad, quadrangular, sides very slightly swollen behind the eyes; 
eyes small, entirely enclosed by a narrow canthus; clypeus narrow, quadrate; mentum 
short, broad; club of the antenne broad, three-jointed, clothed with fine hair; man- 
dibles polymorphic; prothorax shorter than the head, and broader than the elytra, 
crescent-shaped, hinder angles rounded off, prosternal process rounded, carinated ; 
elytra short, broad, oval; front tibiz elongated, spined on the outer side; the four hind 
tibie unarmed. 
Female. Head comparatively large, broad, quadrangular, scarcely differing from that 
of the smallest males; emarginate in front; epistoma not distinctly rounded, as in 
Odontolabis; canthus broad, mentum short, very broad; mandibles amphiodont, with 
four or five apical teeth, separated by a gap from two small basal teeth; prothorax 
broad, crescent-shaped, entirely rounded off at the sides; elytra broad, oval. 
Only two species of this genus are known at present—JH. brachypterus, Westw.., 
from Cambodia, and H. andamanensis, Westw., from the Andaman Islands. 
1. Hurerocutuss BRacuyprerus, Westw. (Plate LX XXIV. figs. 5-7,4; fig. 8,2.) 
Heterochthes brachypterus, Westw. Trans. Ent. Soe. Lond. (3) ii. p. 18, pl. x. fig. 6, g mot 2), 
7, 3, pl. xi. figs. 1-3, 5 9. 
Male. Uniform black, head and mandibles variable, smooth, dull or shining; pro- 
thorax very short and broad, scarcely emarginate in front on the sides, front angles 
acute, sides straight, rounded behind, hind margin straight, or slightly emarginate ; 
elytra convex, scarcely as broad as the prothorax, dull; front tibize long, with two 
spines above the terminal fork. 
Mandibles. 
1. Forma telodonta.—Mandibles flattened, as long as the head and prothorax, with 
a single small tooth behind the recurved hook-shaped tip; base projecting inwards, 
head twice as long as the prothorax, crested in front, and with a small spine rather far 
back behind the eyes (fig. 5). 
2. Forma amphiodonta.—a. Mandibles scarcely as long as the head, sickle-shaped, 
with two apical teeth and a bifid tooth at the base (fig. 6). 6 (gynoides). Mandibles 
very small, as in the female, with a broad irregular series of apical teeth, separated 
by a gap from a tooth-like projection at the base. Head scarcely longer than the 
prothorax, sides behind the eyes punctured; front tibie rather short and broad, with 
two spines above the terminal fork (fig. 7). 
Female. Uniform pitchy black, shining. Head convex, broad, quadrangular, smooth, 
