162 PERCY SLADEN TRUST EXPEDITION 



much indebted to Mr E. E. Austen of the British Museum for examining and determining 

 the material. 



PSEUDOLFERSIA, Coquillet. 



3. Pseudolfersia spinifera (Leach). 



Feronia spinifera Leach, Eprobosc. Ins., ii. 1818, p. 557, pi. 26, figs. 1 — 3. 



Pseudolfersia spinifera Speiser, Zeitschr. Hym. Dipt., ii. 1902, p. 146 ; Austen, Ann. 

 Mag. Nat. Hist., ser. 7, xii. 1903, p. 265, 



It is not attempted here to give the complete synonymy of this very wide-spread 

 species. Its association with the Frigate-bird, which is found on the islands and coasts 

 of all the warmer parts of the world, both tropical and subtropical, is discussed by Speiser 

 (I.e.), and mentioned again by Austen (I.e.). The latter writer also refers to some other 

 species of birds on which the fly has been found. 



The collections of the Percy Sladen Trust Expedition' include seven specimens. 

 Four examples from Aldabra are very much larger than three from the Cargados Islands, 

 but the disparity in size is no greater than that visible among the specimens of the 

 British Museum series. 



Loc. Aldabra : 1907 (Thomasset). Cargados Carajos Islands, 26 and 28. VIII. 1905. 

 Hosts unrecorded. 



Lynchia, Weyenbergh. 



4. Lynchia maura (Bigot). 



Olfersia maura Bigot, Ann. Soc. ent. France, ser. 6, v. 1885, p. 237. 

 Lynchia maura Speiser, Zeitschr. Hym. Dipt., ii. 1902, pp. 155, 163. 



A single specimen has been determined by Mr Austen as belonging to this species, 

 which, he informs me, is a parasite of domestic pigeons in all subtropical and tropical 

 parts of the world. 



Loc. Seychelles: Mahe, 1908 — 9 (no further data recorded). 



Nycteribiidse. 



No members of this family of bat-parasites were found in the Seychelles, nor, so far as 

 I am aware, have any previously been recorded from the group. It must be confessed, 

 however, that very little search was made for Nycteribiidae. A specimen of the flying-fox 

 Pteropus edwardsi was shot in Silhouette in August 1908, and one of Goleura seychellensis 

 was shot at night at Cascade, Mah6, by Fryer, on March 1st, 1909. Neither of these 

 specimens bore any Nycteribiidae : but no further search was made, and the resting-places 

 of bats were not discovered. This branch of the entomology of the Seychelles, there- 

 fore, should decidedly be further investigated. 



As regards Aldabra and the neighbouring coral-islands the case is different. There 

 Fryer did search for Nycteribiidse, and he succeeded in finding one interesting species. 

 The bat-fauna of those islands is mentioned in his work on the "formation of Aldabra," 

 etc. (Trans. Linn. Soc. London, ser. 2, Zool., vol. xiv. 1911, pp. 416 — 7). There is 

 an endemic flying-fox, Pteropus aldahrensis True, confined to Aldabra, i.e. not occurring 



