272 Baron E. de Selys-Longchamps on new 



Allolestes, and several new species. While it is a matter of 

 regret that the material placed in the Baron's hands was not 

 sufficiently large to give him a fair idea of the number of 

 species to be met with in the Seychelle Islands, still it is a 

 source of some satisfaction to me to think that it has been the 

 means of obtaining so interesting a communication as the fol- 

 lowing from so very excellent an authority on the Odonata ; and 

 my especial thanks are due to Mr. M'Lachlan for his valuable 

 assistance in obtaining it, and in looking over and correcting 

 my translation of it. The types of the species I have given 

 to Mr. M'Lachlan. 



List of Sjjecies and Description of a new Genus and five new 

 Species of Dragonflies (Odonata) from the Seychelles. By 

 the Baron E. de Selys-Longchamps. 



Professor E. Perceval Wright, of Dublin, forwarded to me 

 through Mr. M'Lachlan the Odonata which he had collected 

 during the summer and autumn of 1867, in the little-known 

 islands of the Seychelles. 



The specimens, but fifteen in number, are very interesting ; 

 they belong to nine species, of which five are new. I give 

 below the characters of the undescribed species. 



With regard to the geographical distribution of these spe- 

 cies there are several points of interest. Four of them are 

 plainly of an African type, viz. Libellula hemihyalina, Desj. ; 

 L. Wrightiij sp. n. ; Agrion senegalense, Ramb. ; Brachybasis 

 glabra, Burm. The other five species represent forms which 

 inhabit India and Malasia. These are, Libellula trivialis, 

 Ramb. ; Allolestes M c Lachlani, gen. et sp. nov. ; Trichocnemis 

 cyanops,S]).n.', T.bivittata, sp. n. ; Zygonyx(?) luctifera, sp. n. 

 This latter species approaches the genus Cordulia. Libellula 

 hemihyalina comes from Mahe ; all the species, including it, 

 come from Praslin, one of the most easterly of the islands. 



1. Libellula hemihyalina, T. Desjardins. 

 L. diaparata, Ramb. 

 Two males, quite like those from the Mauritius, from Natal, 

 and from Senegal. It will be necessary to refer to this spe- 

 cies L. separata, De Selys, from Algeria, which appears to be 

 nothing more than a well-marked variety. 



2. Libellula, Wrightii, sp. n. 



This species belongs to the African group, to which pertain 

 also L. brachialis, Beauvois, L. contractu, Ramb., and L/. Mar- 

 chali. Ramb. 



