DE. F. LEUTHNEE ON THE ODONTOLABIXI. 479 



(3) Heteeochthes. 



(erepos, different ; oxdrj, elevation.) 

 Heterochthes, Westwood, Trans. Ent. Soc. Lond. (3) 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 antenna 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 tibiae elongated, spined on the outer side ; the four hind 

 tibiae unarmed. 



Female. Head comparatively large, broad, quadrangular, scarcely differing from that 

 of the smallest males ; emarginate in front ; epistoma not distinctly rounded, as in 

 Odoiitolahis ; 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 — //. hrachypterus, Westw., 

 from Cambodia, and H. andmnanensis, Westw., from the Andaman Islands. 



1. Heteeochthes BKACHYPTEEUS, Westw. (Plate LXXXIV. figs. 5-7, cJ ; fig. 8,?.) 



Heterochthes brachypterus, Westw. Trans. Ent. Soc. Lond. (3) ii. p. 18, pi. x. fig. 6, ^ (not ? ), 

 7, (J,pl. xi. figs.l-3,J ?. 



Male. Uniform black, head and mandibles variable, smooth, dull or shining ; pro- 

 thorax very short and broad, scarcely eiaarginate in front on the sides, fi-ont angles 

 acute, sides straight, rounded behind, hind margin straight, or slightly emarginate ; 

 elytra convex, scarcely as broad as the prothorax, dull ; front tibiae 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). b {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 tibiae rather short and broad, with 

 two spines above the terminal fork (fig. 7). 



Female. Uniform pitchy black, shining. Head convex, broad, quadrangular, smooth. 



