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vi 
to have been captured in the migrating stream, between 
March 5 and 13, 1920. 
It was to be observed that there were only three females 
among the nineteen specimens captured—one of Delias 
pyramus and two of Dysphania glaucescens. It was not 
unlikely that the proportion would have increased at a later 
date, or perhaps during wet weather. Certain hitherto 
unpublished observations supported the conclusion that 
female Lepidoptera, butterflies as well as moths, migrated in 
large numbers in these latter conditions. 
J. Rober, writing ““ On Mimicry and Allied Phenomena in 
Butterflies > (Entom. Mitteilungen, Bd. x, No. 1, Jan. 5, 1921, 
p. 23), reversed the usual interpretation and considered that 
“the Dysphania species might rather be considered as 
‘mimics,’ because the widely distributed Dysphania militaris 
closely resembles an also widely distributed Anthrocerid 
(Zygaenid) Canerkes euschemoides, a protected species.” 
The relative rarity of Psaphis (Canerkes) compared with 
Dysphania, as shown in this migrating series and in collections 
generally, as well as the fact that the close resemblance in 
camadeva is confined to the female, disproves Roéber’s suggestion 
and confirms the commonly accepted hypothesis. 
A letter recently received from Mr. A. R. Sanderson con- 
tains the following additional information as to the conditions 
in which the exhibited specimens were captured :— 
“Some of the specimens were taken in the mornings as 
well as the evenings, both by Mr. T. R. Harvey and myself, 
but I cannot say now in what proportions, as no records were 
kept at the time. When I say that the visibility was never 
at a maximum, I mean that the insects appeared in greatest 
numbers either before the sun was fairly up or when it was 
rapidly sinking in the evening. Dull evenings with promise 
of mist later on gave the best show I think and all the insects 
appeared to be in a desperate hurry to cross the ridge. Once 
the sun was well up only occasional stragglers were noticed. 
Very occasional specimens of Delias appeared on the crest 
during the day, but none were captured. These may have 
been odd ones which failed to get over the previous evening. 
This is, however, purely speculative.” 
el ee “2 
