412 Records of the Indian Museum. [Vol. XXIV, 



Legs yellow, with black spines and tarsi. Anterior surfaces 

 of tibiae black. First pair ot femora with black antero-lateral 

 band, which is much reduced on the succeeding pairs. 



Abdomen. First segment yellow, second with yellow sides and 

 black dorsal marking enclosing a longitudinal median band of 

 yellow, meeting a narrow apical ring of the same colour. Third 

 segment yellowish-brown, its anterior margin finely marked with 

 black, and with a lateral baud of black not touching the anterior 

 and of the segment. (The remainder missing.) 



Length of hinder- wing 31 mm. 



Lastly the N. Burmese species circularis Selys, unknown to me 

 except from de Selys' account, is referred by its author to this 

 genus with doubt. 



Group Heterogomphus. 



Large insects (h.w. 40 mm. or more). Cross-nerves between 

 M t _ g and M + of fore-wing as specialized as those of hinder-wing, 

 sectors of arculus approximated at origin, curved, and nearly 

 parallel. Cu, and Cu 2 in hinder-wing parallel to wing-margin. M + 

 and Cu t divergent in the fore-wing. Brace of pterostigma occasion- 

 ally wanting. Wings long and pointed resembling rather those of 

 Ictinus. Hindermost femora when adpressed barely reaching base 

 of abdomen. Abdomen with basal rings on segments 3-7. Colour 

 in some species tending towards a uniform brown. Segments 

 8 and 9 of abdomen slightly dilated from side to side. Upper 

 anal appendages of male equal in length to the last two seg- 

 ments of abdomen ; well separated, parallel and nearly straight. 

 The two branches of the lower appendage also nearly straight, 

 parallel, each carrying an internal tooth near its apex ; each is 

 nearly as long as an upper appendage. 



Genus Heterogomphus Selys. 



Genotype : H. smithii Selys. 



Species studied : H. ceylonicus, sp. nov. 



Characters of the tribe. 



Distribution : Himalayas, Ceylon, Indo-China, S. China, Great 

 Sunda Islands. 



Heterogomphus ceylonicus, sp. nov. 

 i<$. Ceylon. Col. Yetbury. Brit. Mus. 



Head largely black. Upper lip yellow, margined with black, 

 and with a black projection in the middle line from the base. 

 Ante-clypeus yellow, post-clypeus black, with a lateral yellow spot 

 on either side. Vertical part of the irons black, horizontal part 

 yellow, with narrow black base. Vertex black, occiput black with 

 median yellow spot. 



Prothorax black with large lateral spot of yellow and a smaller 

 median paired spot of the same colour. 



