DICRA-TfOCEPnALUS. 35 



]n the 2 the head is coarsely punctured above, and the clypeus 

 is only sharply angular on each side. The prothorax is shorter 

 and less convex, the scutellum and pygidium are naked, and the 

 yellow clothing of the remaining surface is liable to disappear 

 partially or entirely. The legs are black and quite shoi't. 



Length \ 20-28 mm. ; breadth 11-16 mm. 



Nepal ; Sikkim : Darjiling ; Assam : Khasi Hills, Shillong. 



Type in the British Museum. 



Colonel Bingham, who observed this very striking insect in 

 various parts of Sikkim, told me that it is very sluggish and is 

 generally found clinging to the trunks of trees, in which situation 

 it is very inconspicuous. After heavy rains they become active 

 and may be cauglit in large numbers. The males do not appear to 

 fight nor to make any use of their large antlers, which seem, on 

 the contrary, to be rather inconvenient to them. 



Group 2. Macronotideh. 



This Group consists of insects rather gracefully, not compactly, 

 built, and generally much flattened above or even depressed along 

 the middle hue of the back. The pronotum is always more or 

 less produced over the scutellum but leaves a considerable part of 

 it exposed ; and the scutellum itself is moderately long and sharp, 

 but not extremely acute as in the Oxtthteetdes and Loma- 



PTERIDBS. 



The sexes are sometimes quite similar but often differ very 

 strikingly and the differences may appear in almost any part of 

 the external anatomy. 



Table of the Genera. 



1 (6) Body more or less clothed with hair, 



setae or opaque bloom : mesonotum 

 not produced into a long process. 



2 (3) Olypeus of the male produced into a 



horn or horns : that of the female 



bidentate Mycteristes, Cast., p. 36. 



a. Clypeus of the male bearing two 



horns subg. Prigenia, Mohn. 



b. Clypeus of the male bearing a 



single horn subg. Cepiialocosmus, Kr. 



3 (2) Clypeus similar in the two sexes, 



rounded or gently hilobed. 



4 (5) Elytra not excised at the outer 



margins Gnorimidia, Lansb., p. 40. 



5 (4) Elytra excised at the outer margins Macronota, Hoff., p. 41. 



6 (1) Body entirely smooth and shining : 



mesosternum produced into a long 



process Clerota, Burm., p. 66. 



t All length measurements are taken from the front of the clypeus, exclusive 

 of horns or processes ; the breadth is always the maximum breadth unless 

 otherwise stated. 



D 2 



