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No. V.—THE ODONATA. 
By F. F. Lawwiaw, IA. 
(Communicated by J. Srantny Garviner, M.A., F.L.S.) 
Read 21st February, 1207. 
Mr. Garprner’s collection of Odonates includes no species hitherto undescribed. There 
is, however, I believe, no previous record of any Odonate from the Chagos Islands; 
whilst the considerable number of specimens collected in the Seychelles, together 
with the series already described from those islands, permit us to assume that our 
knowledge of their Odonata is fairly complete. 
_ The following is a list of the papers of which I have made use in dealing with the 
collection, together with the reference-marks employed :— 
[1869] pr Sxerys-Lonecuampes, E. List of Species and Description of a new Genus and Five new 
Species of Odonata from the Seychelles. Ann. Mag. Nat. Hist. (4)iii. pp. 272-277 (April 
1869). 
[1869 a] pr Srnys-Lonecuames, E. Enumération des Odonates de Madagascar et des Iles Comores et 
Mascareignes. In ‘ Recherches sur la Faune de Madagascar et de ses Dépendances, Pollen 
et Van Dam. 5° Partie, 1" livraison. Leyde, 1869. 
[1892] Caxverr, P. P. Preliminary Notes on some African Odonata. Trans. Am. Ent. Soe. xix. 
pp- 161-164 (1892). 
[1895] Catvert, P. P. East African Odonata, &c. Proc. U.S. Nat. Mus. xviii. pp. 121-142 (1895) 
[1896]. 
[1896] Marvin, R. Odonates des [es Seychelles. Mém. Soc. Zool. France, 1896, pp. 101-112. 
[1898] Carver, P.P. Odonata from the Indian Ocean, &. Proc. Acad. Nat. Sci. Philad. 1898, 
pp. 141-146. 
In this last paper a full list of the literature dealing with the subject will be found. 
Martin [1896] has given so full an analysis of the relationships of the species composing 
the Seychelles Odonate fauna that it is scarcely necessary for me to add much concerning 
this to my list. It is perhaps worth while to make a few remarks on the subject. The 
Oriental fauna appears to me to consist of at least two elements. One of these, which 
includes the “ dominant ” genera, has entered the region probably from the north and 
has pushed its invasion as far as Australia on the one side and into Africa on the other, 
meeting in Equatorial Africa an endemic fauna. Species belonging to this invading 
body appear to have reached the Seychelles by two routes—firstly, possibly in some cases 
by way of the Maldives, from Asia, and secondly from Africa. By the first route we 
may, I think, derive Tholymis tillarga, Pantala flavescens, Diplacodes trivialis, Ischnura 
senegalensis, and perhaps Anazr guttatus directly from Asia; and, secondly, from Asia by 
way of Africa, where the species have had time to differentiate, Ceriagrion glabrum and 
