(i: Abezaets 19) 
Miillerian mimicry would be proved eventually to be cases 
of climatic resemblances, produced in insects of different 
genera or even families by climate acting on organisms 
similarly constituted, and so responding in a similar manner 
to the same stimulus. 
While readily admitting that the specimens in the exhibit 
were too few for definite conclusions, they showed in JMJelanitis 
and Mycalesis there was good evidence for the belief that in 
two species—leda and narcissws—of these genera the seasonal 
phases are induced by cold and heat, and not by dryness and 
moisture. 
In Atella phalanta there was reason for believing that the 
presence of the violet or purple on the under surface was due 
to deprivation of light during the rearing of the insect from 
the egg to the imago. 
In Catopsilia florella any abnormal temperature produced 
an increased number of yellow females (rhadia), no typical 
white females, but an abundance of intermediates, which were 
absent so far as his experience went under normal conditions 
in Mauritius, though common enough in India and Africa. 
The males remained unchanged. 
In Papilio demodocus there was an increase of red round 
the costal ocellus on the upper side of the hind-wing and a 
very distinct general ruddiness on the under surface of the 
hind-wing produced by cold. 
ASSOCIATION OF ALLIED Forms or Sours American Butrer- 
FLIES.—Dr. G. B. Lonasrarr exhibited a case containing 35 
Ithomiine butterflies of 11 species, belonging to 6 genera, 
all taken in a little over an hour, on March 20th, 1907, at 
about 4.0 p.m. near Caracas, Venezuela, some 3600 feet above 
sea-level. They were disturbed in a shaded gorge and all 
taken on a piece of moist ground measuring perhaps 60 yards 
by 10 yards. They were all flying together like a cloud of 
gnats and many more might have been secured, but the 
number of distinct species was not recognized at the time. 
This habit of butterflies of this group thus congregating 
together was described by Bates.* It affords a striking 
exception to Darwin’s principle that closely allied forms are 
* Trans, Linn. Soc, 1862, pp. 539, 541. 
