118 lt7canti);e. 



Variation of the male. In a small example [crenicolli'i Thoins. , 

 type) the mandibles are of rather triangular sliape and the 

 inner edge is finely and closely serrate beneatli almost from 

 base to apex, with a single small basal tootli on a higher level. 

 In a larger male (the type of laticeps ^loll.) the gap between 

 the basal tooth and the serrate edge is wider, there is a large 

 rounded basal lobe externally, a ridge extends from the basal 

 tooth to near the tip upon the upper face and the anterior 

 half of the mandible curves upward. The type of spcnrn 

 Hope represents the very different constant phase, of wliich 

 it is the only known siJecimen. In this the mandibl(>s are 

 slender, twice as long as the head, strongly and evenly romuled, 

 forked at the tij) and smooth, with a single small tooth at the 

 inner edge a little distance from the base. 



The female is unknowai to me. 



<^. Length (with mandibles), 31-44 mm. ; (without mandibles) 

 25-36 mm. : breadth, 10-5-15 mm. 



Assam : Shillong, Khasi Hills. Burma : iMyitkyina (I*<j 

 Yone, November) ; Nam Taniai Valley, 3000 ft. (B. KnvWack, 

 August). 



Typ<' of I), spencei in the Hope Dept., Oxford, those of 

 crenicollis and laticeps in the Oberthiir collection, that of 

 niordax in Dr. Didier's collection. 



D. spencei is closely related to D. htdboHUs but, in the normal 

 (variable) phase, the mandibles are broader, with the inner edges 

 meeting for almost their entire length, and, in the constant 

 jjhase, the erect tooth found upon the mandible of the corre- 

 sponding phase of D. hulbosus is absent. The line joining 

 the submentiun and mentum is without the jjrominent lobe 

 seen there in large males oi D. bulbosus. 



51. Dorcus bulbosus. (Plate X, figs. 3, 4.) 



Lucanus bulbosus Hope,* Trans. Linn. Soc. xviii, J S4 1 , j). .")Sit, pi. 11, 



fig. 2 ; Parry, Trans. Ent. Soc. Lond. 1870, p. S4. 

 ProNOpocceins btdbosvs Boil., Trans. Ent. 8oc. Lond. ill 13, p. 229. 

 Lucunus punctiger Hope, Tran.s. J^inn. iSoc. x\iii. 1S41, p. .")!)2. 



]3ark chocolate -brown, with the femora of the male red. 

 iiather narrowly elcmgate, with the head broad in the male. 

 The lateral edges of the jjronotum finely serrate, with a 

 spiniform lateral angle far behind the middle, and rather 

 concave from the angle to the blunt hind angle. The jwo- 

 steriunn right-angled, rather compressed and not produced 

 behind. 



$. Long and nariow, with the pronotum and the scutellar 

 region and suture of the elytra shining. The head is strongly 

 and closely rugose. The pronotum is finely ])uiu-tured in the 

 middle, broadly, strongly and closely at the sides. The 

 scutellvm is well punctured. The elytra bear a line of close 



