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A COLLECTION OF DRAGONFLlES FROM BANGKOK- 



By Major F. C. Fraser, i. m. s. 



With Plate 10. 



The collection, which contains five new species, consists of a 

 little over a hundred specimens, and was made during the month of 

 September 1921 by General E. W. Trotter. 



I have included also a small collection, sent me in the pre- 

 vious year by Dr. Malcolm Smith. 



Of interest is a new species of Pseudoc opera, the type of the 

 genus being P. arachnoides Fraser, collected by Mr. Bainbrigge 

 Fletcher this year at Margherita, Assam. The males of the new 

 species and P. arachnoides are almost indistinguishable, but the 

 females vary so much that I have preferred to give the new insect 

 specific rank. The genus will probably be found to be widely spread 

 between the two localities cited. Another insect until now only des- 

 cribed from India (Nagpur and Gauhati) is Agriocnemis d'abreui 

 Fras., which is represented by two females in the collection. (The 

 latter insect and Pseudocopera are described in MS. in the Memoirs 

 of Pusa.) 



No notes have been furnished on the list of dragon-flies which 

 follows : — 



Sub-family Libellulinse. 



1. POTOMARCHA OBSCURA Karsch. 



2. Lathrecista asiatica asiatica Kirby. 



3. Orthetrum sabina Drury. 



4. Diplacodes trivialis Ramb. 



5. Brachvthemis contaminata Fabr. 



6. Crocothemis servilia Drury. 



7. Neurothemis fluctuans Fabr. 



8. Neurothemis tullia tullia Drury. 



9. ACISOMA l'ANORPOIDES PANORPOIDES Ramb. 



10. Brachydiplax malcolmi, sp. nov. 

 Several males and a female from Bangkok, 26.9.21. 



VOL. IV, NO. 4, 1922 , 



