( Ixxiii_ ) 
seemed to favour the supposition of a Miillerian element in 
this series of resemblances, which interpretation was also 
suggested by the cases of “secondary mimicry ” already 
referred to. The striking aposeme, peculiar to African 
butterflies, constituted by dark marginal spots on a pale 
ground, was a predominant feature of the whole series, and, 
though especially characteristic of Mylothris, appeared in some 
instances to exist independently of that genus. Another 
prevalent aposeme was the orange or scarlet basal flush well 
seen in Mylothris riippellii. It was significant that both these 
warning marks tended to be better developed on the under- 
surface. 
Dr. Dixy concluded by drawing attention to the fact that 
these colour-assemblages were by no means isolated clusters, 
On the contrary, they passed into one another in many direc- 
tions, though this was not easily observed in an exhibit 
arranged like the present. As a matter of fact, the whole 
array of specimens shown might be regarded as forming a net- 
work, each individual being connected with all the rest by a 
larger or smaller number of gradations. It would be seen on 
tracing out these lines of connection that they ran to a very 
large extent independently of affinity. The phenomena were 
indeed in many respects comparable with the facts regarding 
mimicry in the Neotropical region, to which he had drawn 
attention in ‘‘ Nature” for October 31, 1907, pp. 677-8. 
MicromorpuisM In A Beerte.—Mr. WILLouGHBY GARDNER 
exhibited a remarkably small specimen of JJeloé proscarabeus 
with an example of the normal size. 
Forms or Arascanta LevaNna AND var. Prorsa.—Mr. W. G. 
SHELDON showed a case containing many examples of Arasch- 
nia levana var. prorsa and intermediates, bred from larve 
found in the department of the Aisne, France, in June last. 
Out of 176 individuals that emerged from the pupa 109 were 
var. prorsa—65 6 dsand 44 2 Qs, 4 approached nearly to 
ab. porima, 2 ¢6 ds and 2 9 9s; 29 were intermediate 
between prorsa and porima—23 ¢ 46s and 6 @ @s: all 
emerging in a room of average temperature at Croydon, July 
20-27th. The forms porima and intermediates were attribut- 
able to the cold summer. ‘The remainder of the specimens 
