Iviii 



to above, and the collection itself, strongly confirm Dr. Dixey's 

 hypothesis (Proc. Ent. Soc, 1906, pp. Ixix, Ixx), brought 

 forward many years ago, of mimetic association between 

 Pseudopontia and Nychitona medusa, as also Dr. Neave's 

 previously published observations (Proc. Ent. Soc, 1908, 

 p. xiii), amplified in his section of this communication. 



From Mr. C. A. Wiggins, November 27, 1921.— " Psetwio- 

 pontia [described as common in a letter of July 31] certainly 

 occurred with other Pierines and especially N. medusa. The 

 flight is very slow and very like N. medusa. I don't think 

 I saw it settled. It was a perfect nuisance in the net as it 

 bent its wings over so, bending them in the middle as I've 

 never seen any other butterfly do, thus " 



The accompanying sketch showed the wings bent over 

 ventrally so far as to be nearly parallel, the bend or false 

 hinge being near the base but separated by a considerable 

 interval from the true hinge. 



From Dr. G. D. H. Carpenter, July 30, 1921.—" Pierines 

 also seem scarce. The commonest is Belenois solilucis Butl., 

 next Leuceronia thalassina Boisd., of the large ones, but 

 Nychitona medusa Cr., and Pseudopontia are fairly abundant. 

 The latter I had not met before, and quite overlooked it 

 (probably not distinguishing it from medusa), until I found one 

 in one of the boy's papers and was at once struck by the 

 transparent appearance and curious venation. I have soon 

 learnt to distinguish it from medusa, but its manner of flight 

 closely resembles that of the other. It looks, however, 

 much more transparent and slightly green. Leuceronia pilaris 

 Boisd., and a few Pinacopteryx and Phrissura also occur." 



November 6, 1921. — " Pseudopontia in every way was much 

 like Nychitona. It flies with it and settles with wings 

 apposed. I don't think I have found it in position of per- 

 manent rest." 



[Received from Dr. Carpenter since the meeting.] 



June 10, 1922. — " I do not think that anyone who had 

 often seen Pseudopontia alive could have much doubt as 

 to its butterfly nature." 



The table on p. Ix, recording all the examples of the three 

 species of this association, contained in the collection, proved 



