XXV. ODONATA. 

 By F. F. IvAiDLAw, F.Z.S. 



(Plate xvi.) 



Introduction. 



Only a few of the specimens discussed below were taken 

 actually on the Abor Expedition, but the collections combined are 

 all from the northern and eastern frontiers of Assam and Burma, 

 and may conveniently be considered together. In addition to 

 those taken in the north-eastern part of Assam and the Abor foot- 

 hills in 191 1- 12, and those collected by Mr. F. H. Gravely in the 

 former year in the Amherst district of Tenasserim between Moul- 

 mein and the Siamese border, there are two lots of specimens, one 

 collected by Mr. H. Stevens in the N, Lakhimpur district, Assam, 

 and one obtained in 191 1 by Capt. G. Topin in the course of an 

 expedition to the north-east frontier of Burma With the excep- 

 tion of Mr. Stevens' collection, of which type specimens will be 

 presented to the Indian Museum, the specimens are the property 

 of that institution. Some 50 or 51 species are represented. 



In all probability the numbers at present recorded from that 

 part of Asia which includes Assam and Burma represent a bare half 

 of the whole Odonate fauna. Available lists show these numbers 

 to amount to about 100 species. 



Accounts dealing especially with the dragonflies of further 

 India are : 



1. " Odonates de Birmanie," de Selys Longchamps. Ann. Mus. 



Genov., (2) x (xxx), 1891, pp. 433-518. 

 de Selys gives a list of 88 species for Burma. His account is 

 based chiefly on material collected by the late vSignor Fea in the 

 neighbourhood of I.eitu and Bhamo. 



2. " Iviste des Neuropteres de I'lndo-China. " Par M. Rene 



Martin, Mission Pavie. 

 Martin comments on the richness of the fauna of Tonquin. 

 It seems likely that this fauna is tolerably distinct from that of 

 the district under consideration here, and not improbably richer. 

 Martin's list contains no fewer than 139 species. 



3. " The Dragonflies of Burma and Lower Siam." (I) Caloptery- 



ginae. Proc. U.S. Nat. Mus., xxviii, pp. 165-187. (II) 

 Cordulegasterinae, Chlorogomphinae and Gomphinae. 

 Proc. U.S. Nat. Mus.^ xxxiii, pp. 267-317. By E. B. 

 Williamson. 

 In these two papers Williamson gives a critical and valuable 



