BY FRANK H. TAYLOR. 815 



Described from a single specimen, which was taken in con- 

 junction with other Tabanidae in light scrub-country. It is a 

 very distinct and easily recognisable species. 



SiLVius ALCOCKi Summers. 



Ann Mag. Nat. Hist., ser.8, Vol. x , p.227(1912). 



Specimens forwarded from Darwin, Northern Territory, by 

 Mr. Hill, show some discrepancies from Miss Summers' descrip- 

 tion; but until a specimen has been compared with the type, it 

 is better to leave them under the above name. 



I have been unable to determine S. mansoni and S. strangmani 

 of Summers, in the material sent by Mr. Hill. 



REFERENCES. 

 Walker (1848) — List of the Diptera in the British Museum. 



(1857) — Transactions of the Entomoloj^ical Society of London, 



Vol. iv. 

 Bkrgroth (1894)— Stett. Ent. Zeitschrift, Vol. Iv. 

 RiCARDO (1901)— Ann. Mag. Nat. Hist., (7) viii. 



(1915)— 0/). cit., (8) xvi. 



Sdmmkrs (1912)— Ann. Mag. Nat. Hist., (8) x. 



