386 



Records of the Indian Museum. [Vol. XXIV, 



other sex. The lateral markings on the first three segments form 

 a more definite band, reaching to the middle of the third segment. 

 In general the colouring is not quite so bright as in the male, but 

 the female specimens are all more mature and in worse preserva- 

 tion. 



Iyength of abdomen of o» 35 + 1*5 mm. (approx.), of hinder- 

 wing 33 mm. ; length of abdomen of 9 41 mm., of hinder-wing 

 37 mm. 



Antenodal cross-nerves on fore- wing 17, post-nodals 13 ; 

 antenodal cross nerves on hinder-wing 14, post-nodals 14. 



Two of the six females examined have the triangles of the 

 hinder-wing free. One female has three cross-nerves in the sul>- 



F:g. 8. — Venation of Perissogomphus stevensi, sp. now (I'lioto by l«. \V. 



Campion.) 



median space of the fore-wing the other specimens have two 

 apiece. 



Series Gomphus (Williamson). 



" Associated with uncrossed triangles, supra-triangles, and 

 sub-triangles is a reduction and specialization in the cross-veins 

 between M,_ 3 and M 4 . This last character is unique in the 

 Anisoptera." The forking of M^o and M» is approximately 

 symmetrical. 



The difficulty of defining genera in a satisfactory way, and 

 of indicating their proper systematic position in grouping them 

 with their allies, obvious enough in all the larger series of Gom- 

 phines, is especially so in the case of this large and dominant 

 series which contains, as Williamson remarks, not less than thirty 

 genera and two hundred and fifty species. 



