group of Butterflies, Potaro District, British Guiana, 429 
the whole of Central and South America with Cuba and 
Haiti. It is true most of the forms are known as distinct 
species, but if we only could ascertain where the forms 
overlapped such as we know atergatis and ceres overlap in 
Trinidad, there could be no possible doubt that the species 
was continuous from Mexico to Southern Brazil and from 
Peru to Para, and that we should find the forms merging 
one into another. With such a species as this it should 
be possible to decide by experiment whether all different 
climates and different climatic conditions tend to produce 
different geographical races as we know them, or whether 
the action of mimicry by selection is sufficient to account 
for these changes. That such a species should adopt 
so many tones of colour cannot be, because the forest has 
such a varying aspect, and that the insect when on the 
wing is variously concealed. ‘The species in several of its 
phases (? all) is extremely conspicuous in flight, and in 
Guiana at least it is very conspicuous at rest on the 
flowers of Hupatorium macrophyllum. This Hupatorium 
is a widely distributed and common plant, and it is quite 
likely that in other parts of the continent it is frequented 
by this same Zycorea under various guises. 
Lycorea pasinuntia. 
This species is certainly commoner than the previous 
but its variation is not so considerable. And with regard 
to the complete darkening of the area of the band in the 
hind-wing it is a comparatively rare feature. 
The variation works out thus with 27 examples :— 
Lycorea pasinuntia. UPPER-SIDE. UNDER-SIDE, 
Hind-wing distinctly banded 18 — 66: 7, 25 9317, 
Hind-wing obscurely banded * G— 227 ih 7A 
Hind-wing band obliterated + ae 0= 
27 27 
* This is the extreme form, but it is not nearly so complete as in 
L. ceres. 
{+ Under this class are placed all those that are not completely 
banded, but the average is not so great as with L. ceres. 
