112 LUCANID^. 



tlie prosterniim is very flat behind and not at all elevated. 

 In small si)eciniens, however, and in the female this is elevated 

 exactly as in the tyjjieal form. Occasionally, as in the type- 

 specimen oi castelnaudi Deyr., the elytra are not quite black, 

 but, at least in part, very dark red or l)rown, probably owing 

 to slight immaturity. 



In my o])inion, the Borncan Eurytrach(dvs prosti Boil., 

 will also he found inseparable from this form. 



I have seen examples of tliis form from Assam, Burma, 

 Siam, Yunnan, Sumatra and Borneo. 



4"). Dorcus hyperion. (Plate VIll, lig. 10.) 



Dorcns hyperion Boil., Bull. Soc. Ent. France, 1899, p. 177. 



Black, smootli, not very shining, the elytra deeply- striate 

 in females and small males, the sides clothed beneath with 

 very fine inconspicuous yellowish pubescence. The eyes 

 very small, almost divided by the narrow canthus. The 

 metasternum coarsely granular at the sides. The legs are not 

 long, the front tibia has a short terminal fork and is sharply 

 and regularly toothed externally and the four ]iosterior 

 tibiae have each a lateral sjiine. 



9. Rather narrowly elongate, moderately convex. The head 

 is rugosely ])unctured, with a pair of small tubercles not far 

 apart in the middle, the canthus is obliquely rounded and 

 extends far back but is only slightly j^rominent. The pronotuni 

 is dull but very smooth, with the sides narrowly but strongly 

 and closely punctured. The front angles are strongly produced, 

 the lateral margins gently rounded, the lateral angles feebly 

 indicated and the hind angles obsolete. The dytra are fairly 

 long and very deeply striate, with large confluent punctures 

 in the stiia>, the intervals between the stria- shining, the inner 

 ones fairly broad, the outer ones very narrow, the striae 

 obliterated at the sides and a])ices, which are densely rugose. 

 The shoulders are sharply angular. The nienfurti is closely 

 rugose. The prosternum is elevated and rounded hehlncl. 

 The front tibia is fairly stout and the middle and hind tihia^ 

 have each a strong lateral spine. 



(^. Broad and depressed, with the elytra rather short, 

 tapering behind. The head and jjronotum are broad and flat, 

 minutely granular and opaque, finely ])unctured in small 

 specimens. The sides of the head are rather })arallel, the 

 eyes minute and almost divided by the very narrow canthus, 

 the sides with a slight bluntly angular process far behind the 

 eye. The clypeal ])rocess is very short and has two slight 

 cusps. The pronotmn is short, the front angles are bluntly 

 pointed, the sides a little excised in front, leaving a distinct 

 angle behind the excision, almost from this to the obtuse lateral 



