DORCUS. 137 



front tibia is gently curved, the extremity palmate, the outer 

 edge serrate, with a few very tine prominent teeth. 



(^. Ojiaque above, with the middle line of the pronotum and 

 the elN-tral suture feebly shining. Rather depressed in form, 

 with the legs very slender. The head is finely and densely 

 granular, rather long, with the sides nearly straiglit and 

 parallel, the front angles very obtuse. The pronotum is short 

 and broad and densely granular. The front angles are bluntly 

 produced, the sides very feebly rounded to the lateral angles, 

 which are almost obsolete, and placed far back near the very 

 obtuse hind angles, with ^\■hich they are united by a short 

 straight line. The elytra are very finely and densely punctured, 

 except close to the suture, where the punctures are scattered, 

 The front tibia is very mhuitely serrate at the outer edge, 

 without any distinct outstanding teeth, and the middle and 

 hind tibiaj are without lateral spines. The clypeal process 

 is pentagonal. 



Variatioi of the male. The front of the head, sloping in 

 small specimens, is vertical in well-developed ones, the upper 

 margin sharply carinate. In small examples the mandibles 

 are as long as the head, simple, with the inner edge serrate in the 

 basal part only (Plate XI, fig 8). In larger specimens a gap 

 appears between a broad basal tooth and the succeeding 

 serrations. At maximum size they are little longer than the 

 head and relatively rather broad (Plate XI, fig 9). 



Constant phase (Plate XI, fig. 10. The mandibles assume 

 another form in certain full-sized specimens. The}' are long 

 and slender (about twice as long as the head), gently curved, 

 with an internal tooth at about f)ne-third of their length, 

 another at al)()Ut two-thirds and two teeth between the last 

 and the tip. 



^. Length (with mandibles), 23-44 mm ; (without man- 

 dibles) 19-28 mm. : breadth, H~\ 2 mm. 



$. Length, lH-22 mm. ; breadth, (>*5-lO mm. 



SiKKiM : Mangpu {E. T. Atkinson). Ass.\m. To.vkin. 



Type in the Royal Scottish Museum, Edinbiirgh. 



I have examined 1 1 specimens of the inconstant and 10 of the 

 constant phase, which are very sharply separated. There is 

 apparently no transition from one to the other. 



ti(). Dorcus nageli. (Plate XII, fig. 17.) 



JJorcujs nageli Arrow,* Trails. Ent. Soc. Lond. xxxviii, 1935, p. 1 IJ, 

 pi. 6, fig. 1. 



Brownish-black, with the elytra, lateral margins of the 

 pronotum and the lower surface chocolate- brown, the lower 

 surface of the tarsi and the inner edge of the four posterior 

 femora and tibite fringed with close-set short yellow hairs. 

 Opaque above and not very shining beneath, depressed, rather 



