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THE PERCY SLADEN TRUST EXPEDITION TO THE INDIAN OCEAN 

 IN 1905, AND 1907-1909, UNDER Mr. J. STANLEY GARDINER, M.A. 



DIPTERA: TABANIDAE. 

 By Major E. E. Austen, D.S.O. 



The material belonging to this family brought back by the expedition includes 

 representatives of only four species, one of which, however, is apparently new. 

 That three out of the four species obtained should belong to the Aegophagamyia- 

 Bouvierella group is not surprising, in view of the predominance of this group in 

 the Malagasy Subregion. 



Through the courtesy of the authorities of the Percy Sladen Trust, the type of 

 the new species described below has been placed in the British Museum (Natural 

 History). 



Pangoniinae. 



Genus Aegophagamyia, Austen. 



Ann. Mag. Nat. Hist. (8) ix, p. 12 (1912). 



Aegophagamyia terticeps, Austen. 

 T. cit., p. 15. 

 Three ? ?, from Astove I., 1907 ; four ? ? from Aldabra, 1908-9 (J. C. F. Fryer). 



The type and para-type of this species, in the British Museum (Natural History), 

 are from Astove I. (P. R. Dupont). 



In the female sex, at any rate, this species bears a superiicial resemblance to 

 Tahanus albipectus, Big., for which on casual inspection it might easily be mistaken. 

 The four specimens noted above as having been taken in Aldabra bear the same 

 number as that attached to the examples of Tahanus albipectus collected in the 

 same island, by Mr. J. C. F. Fryer, showing that the field note printed below under 

 the heading T. albipectus must be taken as applying to the present species also. 



Genus Bouvierella, Surcouf. 

 Bull. Mus. Hist. Nat., Paris, 1909, p. 17(). 



BouviereUa alluaudi, Giglio-Tos. 



Scione allauudi, Giglio-Tos, Ann. Soc. Ent. France, bdv, p. 357 (1895). 



Of this species, originally described from specimens from the Seychelles Is,, the 

 present collection includes no fewer than twenty-two examples, as foUows : — 

 One ^, one 9, from Mahe, Seychelles, v-xii. 1905 (J. S. Gardiner) ; eleven ^^, 

 five $P, from Mahe, Seychelles (5 ^JJ, 2 $$, from the Foret Noire district, x-xi. 

 1908, and 6 (J^J, 3 $ J, from Cascade Estate, at 800 to 1,000 feet or more above sea- 

 level, 1908-9) ; one Q, from Felicite, Seychelles, xii. 1908 ; 2 (J^J, from Praslin, 

 Seychelles, xi. 1908 ; and one ? from Cosmoledo Is., 1907 (//. P. T.). 



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