299 NATURAL HISTORY SOCIETY OF DUBLIN. 
All along this river, in the month of October, dragonflies abounded, 
and all the species collected by me were met with here. One species 
only of several which I collected at Mahé, Libellula hemihyalina, sur- 
vived the ravages of the ants. Knowing that Mr. M‘Lachlan was in- 
terested in the study of the Neuroptera, I took the opportunity of 
sending him a few common species collected in the spring of 1868 at 
Syracuse, to send also the remnants of my Seychelles collection. These 
he forwarded to Baron HK. de Selys-Longchamps, who has most kindly 
not only named all the species, but in the following paper has described 
a new genus, Allolestes, and several new species. While it is a matter 
of regret that the material placed in the Baron’s hands was not suffi- 
ciently large to give him a fair idea of the number of species to be met 
with in the Seychelles 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 following 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 cor- 
recting my translation of it. The types of the species I have given to 
Mr. M‘Lachlan. 
List of Species and Description of a new Species of Dragonflies (Odonata) 
from the Seychelles, by the Baron E. de Selys-Longchamp. 
Professor E. Perceval Wright, of Dublin, forwarded to me, through 
Mr. M‘Lachlan, the Odonata which he had collected during the sum- 
mer 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 species there 
are several points of interest. Four of them are plainly of an African 
type, viz. Libellula hemihyalina, Desj.; L. Wrightii, sp. n.; Agrion 
Senegalense, Ramb.; Brachybasis glabra, Burm. ‘The other five species 
represent forms which inhabit India and Malasia. These are, Libel- 
lula trivialis, Ramb.; Allolestes M‘Lachlani, gen. et. sp. nov.; Zri- 
chocnemis cyanops, sp.u.; T. bivittata, sp. n.; Zygonyx (?) luctafera, 
sp. n. This latter species approaches the genus Cordulia. Lvbellula 
hemthyalina comes from Mahé; all the species including it come from 
Praslin, one of the most easterly of the islands. 
1. Libellula hemthyalina, T. Desjardins. 
L. disparata, Ramb.—Two males, quite like those from the Mau- 
ritius, from Natal, and from Senegal. It will be necessary to refer to 
this species L. separata, De Selys, from Algeria, which appears to be 
nothing more than a well-marked variety. 
2. Lrbellula Wrighti, sp. n. 
This species belongs to the African group, to which pertain also 
LL. brachialis, Beauvois, ZL. contracta, Ramb., and L. Marchal, Ramb. 
