7 
might at first view be regarded as examples of “ mimicry.” 
Inasmuch, however, as they chiefly belonged to groups 
which are not protected, so far as is known, by possessing 
weapons of offence or defence, nor give out bad odours, they 
cannot be regarded as examples of “ mimicry,” as defined by 
Bates; for that theory requires that a non-protected species 
should mimic a species which is protected by having a sting, 
by being uneatable by birds, or otherwise. One example of 
true mimicry, however, was shown, namely, Microdus simu- 
latrix, Cara, which was an exact copy of the common wasp, 
Chartergus apicalis. 
Ordinary Meeting, October 11th, 1886. 
Professor Williamson, F.R.S., President of the Section, 
in the chair. 
Mr. P. Cameron showed a saw-fly, Nematus pcdlipes, 
Fallen, from Aviemore, which is new to Britain and majT- 
possibly be a new species. 
Mr. F. Nicholson exhibited a specimen of the fork- 
tailed Petrel, shot on the Lancashire coast between South- 
port and Formby. 
Under the microscopes were exhibited, by the Presi- 
dent, some young specimens of Drosera from Australia, 
which he had succeeded in raising in his greenhouse. 
By Mr. James Fleming, F.II.M.S., Alcyonella fungosa ; a 
polyzoan new to this district, and some other British fresh- 
water polyzoa, all in a living state. 
B}^ Mr. W. Blackburn, F.R.M.S., some beautiful arrange- 
ments of Diatoms, 
