juoRcus. 149 



advanced stage the head is very large, the two lateral carinac 

 form a black semicircle, interru})ted in the middle, and the 

 mandibles are slender, though scarcely longer than the head, 

 strongly curved, witii a broad bil()l)ed basal lamina, and trifid 

 at the end. In very well-developed males tlie mandibles are 

 about twice as long as the head, bifid at the tip, with an oblicjue 

 tooth at a short distance from the end and another a sliort 

 distance from the base. In the largest specimens the preapical 

 tooth is bifid. 



^. Length (with mandibles), 22 '5-37 mm. ; (without man- 

 dibles) 19-30 mm. : breadth,! -^-I'l'^ mm.. 



$. Length, 17-21 mm. ; breadth,! '5-^' b mm. 



Tenasserim. Andaman Is. Malay Peninsula. Borneo. 

 Philippine Isles. 



Type in the Hope Dept., Oxford University Museum ; 

 tliose oimarginatHS and roepMorffi in the British Museum. 



hi the Andaman Is. the dark sutural stripe of the female 

 dilates, whether invariably or not it is not yet })ossible to say, 

 into an oval patch of variable size. The name rcepfitorffi was 

 given to this form. The type is a male of low developmcJit in 

 wliicli the female coloration appears. A weU-developed maU; 

 from the same islands has the tj-pical male coloration found 

 in continental localities. 



75. Dorcus henryi. (Plate XII, fig. 5.) 



Dorcus henryi Arrow,* Trans. Ent. Soc. Lond. Ixxxiii, 1935, p. 110, 

 pi. 6, fig. 5. 



Entirely black, with the head and pronotum shinmg, excej)t 

 at the sides, and the elytra rugosely ])imctured and dull, except 

 near the suture ; subcylindrical in shape, with the l(*gs short ; 

 the prosternal process vertical in front, not distinctly com- 

 pressed or pointed. 



(J. The head is lightly coriaceous, fairly strongly but not 

 closely punctured, a little depressed in front, with the front 

 angles roimded and a strong pointed process on each side beliind 

 the eye. I'lie clyjieal process is tongue-like, a httle broader than 

 long. The mandibles are short, stout and laterally comjiressed, 

 each with a strong pointed tooth beneath, directed forward 

 and inward, the extremities of the mandibles obli(juely 

 truncate, co-ada])ted and closely serrate. The pronotum is 

 shining, minutely and sparsel}^ punctured, except at the sides, 

 w hich are strongly and c-losely punctured and opaque, with a 

 marginal depression near the middle on each side. The front 

 angles are blunt, tlie lateral margins rounded and not distinctly 

 angulate, and the hind angles completely obsolete. The 

 Kcutelluin is well punctured. The elytra are closely punctured, 

 rather fin(^ly t\(\ir the suture, but the puncturation becoming 



