Glassificdtioii of the Coleopterous family Di/nastidie. 351 



and which really consists of the bidentate clypeus together 

 with the tips of the mandibles. As the extent to which 

 the mandibles of different individuals are opened is not 

 regarded by competent entomologists as a character of 

 weight in the separation of species, and as application to 

 the author for assistance in resolving the matter has not 

 been successful, the name J^. Atkinsoni must be regarded 

 as a synonym of E. Harchoichci, Hope. The locality seems 

 to preclude its reference to the species which is here 

 described. 



E'upatorus gracilicornis, n, sp. 



Crassus, elongatus, niger, elytris flavis, sutiira, marginibiisque 

 externis angustissime nigris : 



$, nitidus, cajiite longissime et gracilissime coruuto, protliorace 

 sat longe 4-cornuto, cornubiis omnibus fere cequalibiis, curvatis, duo- 

 bus lateralibus prope angulum medianum, duobusque dorsalibus : 



9 , inermis, prothorace creberrime punctato, lateraliter rugose, 

 elytris subtiliter coriaceis, punctatis, postice paulo pubescentibus. 



Long. 48-70 mm. Lat. max. 25-35 mm. 



Hah. Assam, Jaintia Hills ; Burma, Shan States ; Siam, 

 Chengmai ; ToNKiN, Dong- Van. 



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. Hardwiclxi, but 

 the body is rather more elongate, and the elytra are 

 normally lighter in colour and without a paler border. 



^. The armature is similar to that of E. Hardund'ei, 

 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 forther 

 back than in the other species, giving the prothorax the 

 appearance of being more protluced in front. 



^. 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. 



The curvature and direction of the horns of the male 

 vary very much. The cephalic horn is sometimes very 

 strongly and sometimes only slightly curved backwards 



