BOENEA.N DRAGONFLiES. 315 



(T. plagiata type), the other with costal stripe only {T. vittata 

 type). No male with transverse bands has been recorded. 

 Structurally the females of the two forms are identical, and 

 Ris's view is in all probability correct. In this case T. vittata 

 McLach. will be a synonym of T. 'plagiata Waterh. 

 2 . Abd. 68 mm., h. w. 80 mm. 



[Tetracanthagyna vittata McLach.] 



Tetracauthaygna vittata McLachlan, Trans. Entomol. Soc. 

 London, 1898 ; Martin, Oat. Coll. Selys, .5^]schn. pp. 144-145 

 (fig. 143) ; Ris, Ann. Soc, EntomoL Belg. Iv. 1911, pp. 24.3-244. 



1 cT , 1 $ . Kuching, iv. 99. 



See remarks under T. plagiata. 



The female of this pair is possibly the largest and bulkiest indi- 

 vidual of all living Odonata on record. The pair in full flight 

 must have afforded a splendid sight to any entomological 

 enthusiast. 



S . Abd. 70 + 7"5 mm., h. w. 72 mm. 



9. • Abd. 70 mm., li. w, 83 mm. 



14. *Tetracaxthagyna degorsi Martin. 



Tetracanthagyna degorsi Martin, Bull. Soc. Enbom. France, 

 1895 ; McLachlan, Trans. Entomol. Soc. London, 1898; Kriiger, 

 Stettin. Entomol. Zeitg. 1898, p. 288 ; Martin, Oat. Coll. Selys, 

 ^schn. p. 147. 



15. *TETRACANTHyGNA WATERHOUSEI McLach. 



Tetracanthagyna ivaterhousei McLachlan, Trans. Entomol. Soc. 

 London, 1898 ; Martin, Mission Pavie, Nevropteres, (sep.) p. 14 ; 

 Martin, Oat. Ooll. Selys, .'Eschn. pp. 143-144 (fig. 142). 



16. Tetracanthagyna brunnea McLach. 



Tetracanthagyna hrunnea McLachlan, Trans. Entomol. Soc; 

 London, 1898 ; Martin, Cat. Ooll. Selys, ^schn.- pp. 146-147 

 (fig. 141). 



Teh^acanthagyna plagiata Laidlaw (nee Waterhouse),' Proc. 

 Zool. Soc. London, 1902, p. 79. 



(The specimen recorded by me, loc. cit. 1902, from the Malay 

 Peninsula belongs here and not to T. plagiata.) 



1 9 . Sarawak : h. w. 66 mm., abd. 55 mm. 



17. Gynacantha demeter Ris. 



Gynacantha demeter IRls, Ann. Soc. Entomol. Belg. Iv. 1911, 

 pp. 245-246 (fig. 12). 



1 cJ, 1 ?. Matang Rd., 22. ii. 20. 



18. Gynacantha dohrni Kriiger. 



Gynacantha dohrni, Kriiger, Stettin. Entomol. Zeitg. 1898, 

 pp. 277-287, fig. p. 280;" Martin, Oat. Coll. Selys, ^schn. 



