270 DTXASTIITyi:. 



245. Eupatorus gracilicornis. 



Eupatorus gracilicoruis, Arrow,* Trans. Ent. Soc. Lond, 1008, 

 p. 351. 



Black, with the elytra straw-coloured except at the sutural and 

 extreme outer margins, which are dark. The form and colouring 

 are almost those of E. hardwicl:ei , but the body is rather more 

 elongate and the elytra are normally lighter in colour and without 

 a paler border. 



S . The armature is similar to that of E. Jiarchvickei, but all the 

 horns are more slender, that of the head in the largest specimens 

 reaching a length of 40 mm. The anterior thoracic horns are 

 much longer, being fully as long as the posterior pair, strongly 

 curved, and arising farther back than in the other species, giving 

 the prothorax the appearance of being more produced in front. 



2 • This is extremely like that of the older species, but besides 

 the greater elongation and paler elytra, the latter are minutely 

 pubescent only at the posterior part and the pronotum is more 

 strongly sculptured and closely rugose at the sides. 



Length 48-70 mm. ; breadth 25-35 mm. 



Assam : Jaintia Eills ; Buema : Shan States ; Siam : Chengmai; 

 Tonkin : Dong- Van. 



Type in the British Museum. 



The curvature and direction of the horns of the male vary 

 very much. The ceplialic horn is sometimes very strongly and 

 sometimes only slightly curved backwards, and the anterior 

 thoracic horns generally diverge considerably, but may slightly 

 converge. In small specimens the dorsal horns may completely 

 disappear. 



I have seen a considerable number of examples, most of them 

 males. 



246. Eupatorus birmanicus. 



Eupatorus bu-mauicus, Arroic,* Trans. Ent. Soc. Lond. 1908, 

 p. 352. 



The colovir is a very dark chestnut, approaching black, and the 

 form convex and moderately elongate. The upper surface is 

 coriaceous and scarcely shining, the scutellum and elytra quite 

 opaque, and the pygidium and propygidium finely rugose and 

 minutely setose. The lower surface is very scantily furnished 

 with tawny hairs. 



cJ . The head is bidentate in front and bears a long slender and 

 sharply-pointed horn, strongly curving backwards in the basal half 

 and afterwards almost straight. The prothorax is about as long 

 as it is broad, with the sides nearly parallel behind and strongly 

 tapering in front, the margins produced into a sharp point on each 

 side just behind the front angle and the dorsal i)art bearing a pair 



