DE. r. LEUTKNER ON THE ODOXTOLABINI. 477 



I had had only this specimen to guide me, I should have supposed that 0. intermedius, 

 Deyr., 0. carinatus, Linn., and the middle-sized specimen of 0. ciiigalensis, Parry, were 

 all distinct. But this species varies to such an extent that it is difficult to find two 

 males which are exactly alike. 



I have done my best to do justice to my predecessors ; but it is difficult even to 

 divide this species into two, as attempted in PI. XCVII., for we find large and hairy as 

 well as hairless specimens ; the front tibiae are sometimes straight, sometimes curved, 

 and the mandibles of the mesodont form vary to any extent. The striking difference 

 in the prothorax of the male (figs. 7-9), which appears much broader in the middle, 

 arises only from the front margin of the prothorax being narrower. The question of 

 specific distinction can only be decided if the Cingalese race shows constant differences 

 when compared with Indian specimens ; but we have not a sufficiently large series of 

 the latter for this purpose. In the meantime it may be best, simply as a matter of 

 convenience, to separate two races, both of which are found in Ceylon : — 



(a) 0. carinatus, Linn. (figs. 7-9, cT; fig. 10,?). — Mandibles strongly curved, deeply 

 channelled on the upper surface ; prothorax broadest in the middle, and rather nar- 

 rower in front. Head, prothorax, and elytra shining in the middle, and hairless. 



(b) 0. cingalensis. Parry (figs. 11-13, d; fig. 14,?). — Much larger than form a, man- 

 dibles generally longer and more slender, prothorax as broad in front as in the middle, 

 elytra dull, or clothed with fine brown hair (Calcutta, Madras, Ceylon), 



Species incertce sedis. 

 30. Odontolabis striatus, Deyr. (Plate XCVII. figs. 1, 2,d; fig. 3,?.) 



cJ ? . Odontolabis striatus, Deyr. Ann. Soc. Ent. France (4) iv. p. 313 (1864), pi. iv. fig. 3,^ 

 (admirable figure) ; Westw. Trans. Ent. Soc. Lend. 1874, p. 360 (^Jvar.), pi. iii. fig. 4. 



Male. Entirely clothed with fine brown hair, as in 0. dalmani. Head flattened, 

 canthus narrow, straight; spine behind the eyes sloping obliquely backwards and 

 downwards ; prothorax broader than the elytra, fi-ont edge strongly emarginate on 

 each side, the sides moderately curved as far as the central spine, and then deeply 

 emarginate ; hind margin waved ; elytra flattened, the shoulders angulated, clothed with 

 brown hair, and with four smooth longitudinal stripes on each side, which unite before 

 the tip ; front tibiae rather broad, with five or six spines above the terminal fork ; man- 

 dibles as long as the head and prothorax together, flattened, not much curved at the 

 tip, and bifurcate ; base broader, with two teeth on the inner side. 



Female. Size and appearance of 0. carinatus, and entirely clothed with brown hair, 

 as in the male. Head flattened, canthus broad, emarginate in front, and then pointed ; 

 mentum with a crescent-shaped crest; prothorax with the front edge deeply emar- 

 ginate on each side ; front angles acute, the sides slightly convex, and deeply emargi- 

 nate behind, hind margin strongly waved ; elytra pubescent, with four- parallel smooth 



