BORNEA.N DRAGOJSTFLIES. 



315 



[T. plagiata type), the other with costal stripe only {2\ vittata 

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

 Structurally the females of tlie 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. jjlagiata Waterh. 

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



[Tetracanthagyna vittata McLach.] 



Tetracauthaygna vittata McLachlan, Trans. Entomol. Soc. 

 London, 1898 ; Martin, Cat. Coll. Selys, .Eschn. pp. 144-145 

 (fig. 143) ; Ris, Ann. Soc. Entomol. Belg. Iv. 1911, pp. 243-244. 



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



See remarks under T. jylagiata. 



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., h. 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, Cat. Coll. Selys, 

 ^]schn. p. 147. 



15. *Tetracanthygna waterhousei McLach. 



Tetracanthagyna loaterhousei McLachlan, Trans. Entomol. Soc. 

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

 Martin, Cat. Coll. Selys, ^schn. pp. 143-144 (fig. 142). 



16. Tetracanthagyna brunnea McLach. 



Tetracanthagyna hruunea McLachlan, Trans. Entomol. Soc. 

 London, 1898 Martin, Cat. Coll. Selys, .'Eschn. pp. 146-147 

 (fig. 141). 



Tetracanthagyna i)lagiata Laidlavv (nec 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. 66 mm., abd. 55 mm. 



17. Gynacantha demeter Ris. 



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

 pp. 245-246 (fig. 12). 



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



18. Gy^v^acantha dohrxi Kriiger. 



Gi/nacantha dohrni, Kriiger, Stettin. Entomol. Zeitg. 1898, 

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



