DORCUS. 131 



at the base, the outer and })osteiior j)arts. The front tibia 

 is broad, strongly tootlied laterally and shortly l)ilol>ed at 

 the end. 



J. Long and narrow, with very slender legs, the u])j)er sin-faee 

 opaque. The head antl pronotuni are hnely and densely 

 granular, the front angles of the head are very obtuse, the 

 canthus narrow, extending to about the middle of the eye, 

 the head })roduced behind and gently rounded behind the 

 eye. The front angles of the pronotuni are j)roduced, the 

 sides gently rounded to far beyond the middle, where they are 

 acutely angulate, and slightly eoncave to the blunt hind angles. 

 The elytra are entirely opaque and the shoulders are acutely 

 angular. The front titna is slender, finely toothed externally, 

 narrowly forked at the extremity, and is tufted beneath at its 

 inner extremity. 



Variation of the male. Small si)ecimens are redder in c(jlour 

 and the upper surface is less dull than in larger ones. The 

 head, pronotuni and elytra are also distinctly and finely 

 punctured, the el^'tra rather strongly and densely in the anterior 

 part. The mandibles in the smallest s])ecimens are as long 

 as the head and feebly serrate internally from the base almost 

 to the apex. In larger examples the teeth are stronger, the 

 basal one broad, the last a little detached from the rest. Well- 

 developed males have the mandibles twice as long as the head, 

 gently and evenly rounded, the teeth unevenly s])aced, the 

 basal one bifid and the apex shortly and equally forked. 



(J. Length {vi'\i\\ mandibles), 20-39 mm. ; (without mandibles) 

 17-28 mm. : breadth, 7-11 mm. 



?. Length, 22-26 mm. ; breadth, 9-10 mm. 



Assam: Naga Hills (If. Doherty) ; Kiiasi Hills, Sylhet, 

 Shillong ; Manipur {W. Doherty). 



Type in tlie Rene Oberthiir collection. 



01 Dorcus histrio. (Plate XI, fig. 10.) 



Dorcus histrio Arrow,* Trans. R. Ent. Soc. Lonfl. Ixxxiii, 15)3.'), 

 p. 109, pi. 6, fig. 4 ; Ann. Mag. Nat. Hi.st. (11) ii, 1938, p. 54. 



Head, lower surface and legs dark reddish-black, the sides 

 of the metasternum anteriorly marked with a triangular 

 orange patcli ; the ])ronf)tinn of the male bright yellow, with 

 three longitudinal black stripes, the elytra yellow, with a 

 black sutural stripe; the female with bright yellow elytra, 

 decorated with a large common black triangle extending 

 fiom the slioulders to tlie eiul of the suture. The prosternum 

 })rominent behind but not ]>ointed. 



2. The body is oval and convex, not long, glossy above 

 and beneath. The head and pronotuni are dark, the latter 

 with three rather indefinite reddish marks on each side, the 



k2 



