Cet) 
witnesses to an earlier and less perfect Papeeeentabion of light 
shining through a hole. 
“Tt is interesting to note that the holes represented in these 
apparent dead leaves seem to have been produced by gnawing, 
whereas in the leaf-fragment suggested by C-album the 
forces of the inorganic environment, which by their prolonged 
action have produced the wear and tear of the margin, 
have also been responsible for the more centrally-placed dis- 
continuity. Comparing various species of the genus Polyyonia 
(Grapta), it is seen that the curved C-like window occurs in 
several; in some the suggested rent is V-like, while occasionally 
the stalk appears to represent a hole of a reniform shape.” 
Professor Poutron also exhibited a pair of /Mypolimnas 
misippus taken “in coitu” on Feb. 3rd, 19038, by Mr. Horace 
A. Byatt, B.A. (Lincoln College, Oxford), near his highland 
home ata height of 4500-5000 feet, in Dedza, Central Angoni- 
land, British Central Africa. The specimens are remarkable 
in that the female is excessively worn and old, far more so 
than the male. Such an observation tends towards the econ- 
clusion that pairing occurs more than once in the life of an 
individual of this species. 
Mr. Byarr also writes (Feb. 15th, 1903) concerning the 
species—‘‘ Close round my house //. misippus is in vast numbers 
just now, but other species are not very numerous. You will 
see that at Dedza L. chrysippus is quite rare—at least at this 
season, I have sent you only two, I think, and my eyes are 
always open for it.” This observation of relative abundance 
certainly suggests the Miillerian rather than the Batesian 
interpretation of the mimicry of the former for the latter 
species ; although quite near to Dedza the proportions may be 
entirely different. The following passage shows how rapidly 
Mr, Byatt can pass from one kind of area into another. ‘“ You 
must understand that I have two distinct climates to work in. 
IT am about 4500 to 5000 feet up—the top of Dedza is 7000 
—and I drop straight down into what is really tropical Africa. 
on the lake level: tropical foliage, swamp, damp atmosphere 
and intense heat. This station might be in 8S. Africa—say 
the Orange River Colony, Consequently Lepidoptera are widely 
different; in this open country ey are fewer and more sober 
