438 PERCY SLADEN TRUST EXPEDITION 



[6. Zyxomma petiolatum Ramb. 



Zyxomma petiolatum Ramb., Ins. N^vr,, p. 30, pi. 2, fig. 4d (1842). 



Zyxomma sechellarum Martin, Mem. Soc. Zool. France, ix. p. 103 (1896) ; Laidlaw, 

 Trans. Linn. Soc. London, ser. 2, Zool., xii. p. 89 (1907). 



Loc. Seychelles and Chagos Islands, 1905. 



Not represented in the present collection. 



Concerning this species Dr Ris has written to me as follows : — " I cannot find 

 any appreciable difterence between specimens from the Seychelles and a series from 

 Borneo and another from Cape York which I possess. Tlie differences are in size, which 

 is variable, and in colour of wings, which is variable according to maturity." I may 

 add that I had arrived independently at the conclusion that Martin's insect could not 

 be separated specifically from Rambur's.] 



7. Tholymis tillarga (Fabr.). 



Libellula tillarga Fabr., Ent. Syst., Suppl., p. 285 (1798). 



Loc. Seychelles. Mahe: 1 $ (Dupont). Praslin, 1905. 



A common East-Indian species, recorded, inter alia, from Mauritius and Reunion. 



8. Pantala Jlavescens (Fabr.). 



Libellula Jlavescens Fabr., Ent. Syst., Suppl., p. 285 (1798). 



Loc. Seychelles. Mah^ : 2 $ (Dupont) ; 2 ^, 1 $, Long Island, VII. 1908 ; Praslin, 

 1905. Aldabra : 10 ^, 3 ? (Fryer). Assumption : 4 ^, 8 ? (Dupont), 1910. 



" In Aldabra this species began to be seen in December, beginning of wet season " 

 (Fryer). 



A Dragonfly of exceptionally wide distribution, occurring in all the warmer parts of 

 the world, but not in Europe. 



9. Rhyothemis semihyalina (Desj.). 



Libellula semihyalina Desj., Rapport Soc. Maurice, i. (1832). 



Loc. Seychelles. Mah^ : 2 ^, 8 ? (Dupont); Praslin, 1905; Coetivy, 1905. 

 Assumption Island : 1 $ (Dupont), 1910. 



A species described from Mauritius, and known also from various parts of Africa. 



10. Tramea basilaris (Pal. de Beauv.). 



Libellula basilaris PaL de Beauv., Ins. Afr. Am^r., p. 171, t. 2, f 1 (1805). 



Log. Aldabra: 1 ^ (Fryer). Assumption Island : 1 ? (Dupont), 1910. 



This Afiican species has been recorded from Madagascar and the Glorioso Islands, 

 and the British Museum Collection contains specimens from Bechuanaland, Mashonaland, 

 Natal, the Congo, and the Gold Coast. There are certain other specimens in the same 

 collection, from Ceylon, which I consider should be referred to this species, rather than to 

 the Indian form, T. burmeisteri Kirby. 



