37 2 Records of the Indian Museum. [Voi,. XXIV, 



Types of new species unless otherwise stated will be deposited 

 with the Zoological Survey of India (Indian Museum, Calcutta). 



Systematic Notes with description of New Species. 

 Series Hagenius Williamson. 



A small series characterized by the possession of a distinct 

 trigonal supplement ; that is to say, the boundary nerve between 

 the two rows of cells which follow immediately the triangles of fore 

 and hinder- wings is straightened out to form a single continuous 

 nerve and does not consist, as in other Gomphines, of a number 

 of separate nerves meeting one another in angular fashion. (Or in 

 other words, the cells immediately following the triangles are 

 rectangular.) 



The distal margin of the triangle posterior to the attachment 

 of this supplement, is distinctly concave. Triangles crossed by a 

 single nerve. Some reduction of the cross-nerves between M,_ 3 and 

 M 4 in hinder-wings. I^egs very long, hinder femora as much as 

 i y 5 mm. long in Sieboldius. Head relatively small, thorax robust, 

 wings rather pointed. 



Distribution : Holarctic and oriental. 

 i 



Genus Sieboldius Selys. 



Genotype : Sieboldius japponicus Selys. 



Head very small relatively, abdomen black with yellow rings ; 

 second segment of abdomen shorter than third. 



Sieboldius japponicus Selys. 



This fine species is chiefly Malayan in its distribution. Il 

 occurs in I,ower Siam, and I have entered it on my list as there 

 seems a possibility that it may turn up in Burma. In all probab- 

 ility it does not occur in Japan. Its only near allies are another 

 species of the genus, 5. albardae Selys from Pekin and the two 

 species of the closely related genus Hagenius, one, H. brevistylus 

 Selys, from N. America, the other H. gigas Martin, from Tonkin. 

 Kriiger's species, S. grandis from Sumatra, does not appear to be 

 separable from the Selysian species. 



Series Diastatomma Williamson. 



( = Iyegion Lindenia Selys.) 



Venation dense. The series " is unique by the presence of a 

 strongly developed sector (branch) of Rs and a usually less well 

 developed sector of M 4 ." Triangles of fore and hinder- wings 

 dissimilar. Outer side of triangle of hinder-wing slightly concave. 

 I.egs short. 



