io8 
E. & H. Drabble. 
TABLE SHOWING SYRPHID VISITORS TO THE FLOWERS OF 
It is evident from these tables that the plants attracting most 
species were Rubus (39), Heracleum (29), Leontodon (16), Hieracium 
(14), and Aster (13). It is necessary, however, to consider the 
number of individuals visiting the flowers and not merely the 
number of species. When this is done it is found that Rubus is 
by far the most attractive, much more so indeed than is indicated 
by a mere list of species visiting this flower. Next to Rubus come 
Hcracleiuu Sphondylium and Aster, and far below these in order 
come Leontodon and Hieracium. The number of Syrphids visiting 
Convolvulus arvensis was rather unexpected, as it does not strike 
one as a “hover-fly” flower. We have convinced ourselves, how¬ 
ever, that these flies do actually and regularly take the nectar 
