444 DR. F. LEUTHNEE ON THE ODONTOLABINI. 



Var. Lucanus cumingi, Hope, Cat. Luc. Col. p. 17. 



Var. Lucanus dux, Westw. Anu. Nat. Hist. viii. p. 124 (1841) ; Cab. Or. Ent. p. 17, pi. viii. fig. 1 



(telodout ; good figure) . 

 Odontolabis dux, Parry, Traus. Ent. Soc. Lond. (3) ii. p. 76. 



Male. Uniform dull black, elytra less shining than in the other species, head large, 

 longer than the prothorax, front edge strongly emarginate ; the sides straight, or 

 oblique in front ; canthus narrow ; spine behind the eyes obtuse ; the lower parts of 

 the cheeks coarsely wrinkled or pitted ; prothorax twice as broad as long, its front 

 edge strongly emarginate on each side ; the sides trispinose (with two deep con- 

 cavities) ; the middle spine never so prominent as in 0. belUoosus ; in the smallest 

 priodont specimens the front spine is obsolete ; prosternal and mesosternal processes 

 very prominent ; elytra long, oval, slightly shining ; front tibiae long, with one or two 

 spines above the terminal fork. 



Mandibles. 



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

 rounded, convex within, and curved downwards, with only four apical teeth (figs. 1, 2). 

 Head with raised crest. — [0. dux, Westw.) 



2. Forma mesodonta. — Mandibles shorter, rounded, with four apical teeth, and a 

 strong tooth beyond the middle, projecting downwards: — a. With no basal teeth 

 (fig. 2) {0. alces, Fabr., type); h. One or two basal teeth (fig. 4). 



3. Forma ampModonta. — Mandibles rather longer than the head, broad, flattened, 

 with four or five apical and three obtuse basal teeth of equal size separated from the 

 former by a semicircular gap (fig. 5). — (0. cvmingi, Hope.) 



4. Forma j^riodonfa. — Mandibles as long as the head, flattened, similar to those of 

 0. IcUicosus, with eight or nine crowded teeth, without gaps, on the inside of the 

 mandibles (figs. 6, 7, the latter with prothorax like the female). 



Female. Uniform deep black ; mandibles, head, and sides of prothorax obsoletely 

 shagreened. Elytra dull, extremely finely punctured ; head broad ; upper side mode- 

 rately convex ; canthus broad ; mentum wrinkled, slightly expanded on each side ; 

 mandibles with three or four irregular teeth on the inside ; prothorax very convex, 

 strongly emarginate in fiont, the front angle generally obtuse, the sides slightly 

 S-shaped as far as the middle spine, and then emarginate ; hind margin waved ; 

 prosternal process variable, generally round, but often flattened ; front tibiae with 

 four or five obtuse spines above the slightly developed terminal fork; elytra convex 

 long, oval ; the shoulders acute, or somewhat obtuse. 



Ilahitaf. Luzon (Manilla). 



Number of specimens examined : 320. 223 specimens (112 males and 111 females) 

 in a single consignment. 



