(DIPTERA). 
ws Be 
FRED. VW THEOBALD, B.A., F.E.S. 
CAMBRIDGE UNIVERSITY Are NSION LECTURER IN INJURIOUS INSECTS, ETC. 
. t 
VOL. fT. 
* 
oe 
LONDON: 
ELLIOT STOCK, 62, PATERNOSTER- ROW, E.C. 
1892. 
