MR. F. BALFOUR BROWNE ON AQUATIC COLEOPTERA. 2Q5 
exception of October. In other words, with the exceptions 
mentioned, there was a greater distribution of individuals 
during last season than during 1904. 
If we now turn to Charts 1 and 2 we shall see at a glance 
that as far as the Hydradephaga are concerned the curves for 
