ss PERCY SLADEN TRUST EXPEDITION. 
Agriocnemis evilis, and perhaps Rhyothemis hemihyalina and Tramea continentalis. 
These are all of them species that one associates with cultivation. Less certainly 
belonging to this invading fauna we may put Zyxvomma seychellarum and Orthetrum 
wrighti, the latter derived through Africa. 
The remaining species, except Hemianax epphipiger, are peculiar to the islands and are, 
I believe, a fragment of the same fauna as that which is presumably being slowly 
displaced in the Oriental Region by the invading fauna already spoken of. Another 
fragment of this fauna is, I believe, to be found in Madagascar, where it has succeeded 
in holding its own toa greater extent than elsewhere, save in the Malayan Subregion, 
though it is perhaps possible to trace some relationship with the Australian fauna in the 
island of Madagascar. In concluding these scanty notes, which I have added rather 
with the intention of attracting further notice to the relationships of the land-fauna of 
the Seychelles than with the expectation that they are likely to furnish an adequate 
explanation of the difficulties that the study of that land-fauna presents, I venture to 
point out what a valuable source of information on the subject of zoogeography the 
Odonata are likely to offer. Probably no group of insects is in so satisfactory a condition so 
far as its classification goes, thanks largely to the splendid work of Selys and McLachlan ; 
few are less unwieldy or more easily collected, preserved, and examined ; and, lastly, 
their dependence on fresh water renders their accidental carriage from country to country 
less probable than in the case of most other orders. It will prove to be no exaggeration 
to say that they will afford as much information to the student of zoogeography as any 
group of vertebrate animals. 
The following species, recorded by Martin [1896], are not included in Mr. Gardiner’s 
collection :— 
CorpuLInazZ. Hemicordulia delicata, Martin. 
JESCHNIDE. Hemianax epphipiger, Burm. 
Gynacantha stylata, Martin. 
AGRIONIDE. Hemicnemis cyanops, Selys. 
Telebasis alluaudi, Martin. 
Libellulide. LIBELLULIN. 
1. Pantala flavescens (abr.). 
Localities. Seychelles: Mahé, 76,12; Praslin, 1¢6,19; St. Anne,1¢. 
2. Rhyothemis hemihyalina (Desjardins), 
Localities. Seychelles: Mahé, 1¢; Praslin, 1¢,29; Coetivy,43,29. 
3. Tramea continentalis, Selys. 
Localities. Seychelles; Mahé, 24; Praslin, 1¢; Coetivy, 54; St. Anne, 3¢, 192. 
Chagos: Diego Garcia, 32. 
¢ 
4. Tholymis tillarga (Fabv.). 
Localities, Seychelles; Mahé, 1¢,19; Praslin, 16,22. 
ae 
