DRAGONFLIES FROM BANGKOK. 237 



The appendages are very similar to those of the related forms, 

 the superior being foliate, triangular as seen from behind and direct- 

 ed downward between the inferior, blackish above. In riibiae the}?- 

 lie either directly above or outside the inferior. The inferior are 

 triangular as seen from the side and rapidly taper before the apex 

 which is tipped with black. They are directed almost directly up- 

 ward. 



25. PSEUDOCOPERA TROTTERI, sp. nov. 



2 pairs. Sept. 2. 21. 



Male. Length of abdomen 36 mm., hind wing 21 mm. 



This species closely resembles a pair of dragonflies, — Pseudo- 

 copera arachnoides Fras. (Mem. of Pusa), collected by Mr. Bainbrigge 

 Fletcher at Margherita, Assam, 14-19.5.1920 which I had the 

 opportunity of examining this year. It is a curious coincidence that 

 another species, closely allied, should be reported so soon and from 

 a locality far distant. 



The genus is closely akin to Coeliccia from which it differs, 

 however, by the shorter petiolation of the wings, this ceasing 

 proximal to ac instead of at ac. The two hinder pair of tibiae are 

 also dilated, the hindermost enormously so. Lastly the anal append- 

 ages are strongly generic and differ markedly from any found in 

 Goel iccia. 



The male of this new species differs from P. arachnoides by 

 the much shorter length of the abdomen, 36 mm. as against 41 mm. 

 in arachnoides, by the fewer postnodal nervures, 13/11 as against 

 15/13, by the longer and narrower stigma and its darker colour, 

 sepia, and lastly by the 9th abdominal segment being entirely pale 

 blue instead of blue marked with black, 



The females of the two species differ rather more markedly 

 and this may be better shown in tabulated form as follows : — 



VOL. IV, NO. 4, 1922. 



