424 Mr. W. J. Kaye’s Notes on the dominant Miillerian 
one of the forms shows signs of forming the rounded 
shape of the black patch conforming to that of Melinza 
cramer, yet I have six H.numata from the Demerara River, 
and two or three from much lower down the Essequibo, 
viz. Rockstone and Bartica, which show this in a remark- 
able way. Two in particular show a great extension of 
the black inwards about the cell, a phase of variation 
unknown to me from the Potaro. 
The other two species of Heliconius, viz. H. vetustus 
and H, silvana, have occurred quite sparingly, the latter 
especially so. H. vetustus is here a comparatively constant 
species, and in the eight specimens secured the black area 
in the hind-wing is never divided by the ground colour. 
The only variation of the black area is that in some 
individuals the black extends nearer the costa, basally 
giving the appearance of a rounded area, while in others 
the black area stops short by quite a horizontal line. 
Heliconius vetustus. 
The eight specimens divide up thus :— 
5 Black area sharply cut off 2= 25 % 
Upper-side Black area extended upwards 6 = 75 % 
; Black area divided. . . .2=25 7% 
Under-side Black area undivided . 6 = 75 % 
The latter with the rounded black area agree very 
closely with some of the H. nwmata, especially those 
(6 “% only) in which the black is undivided by the 
ground colour. But in the case of those that are almost 
undivided the shape is the same giving an agreement of 
another 27 '/, or 33 / in all of the H. numata with this 
more usual form of H. vetustus. 
A study of the red sub-apical patches in the fore-wing 
gives the following interesting result :— 
Upper-side of fore-wing without red markings before apex 8 = 100 % 
Upper-side 55 with & S 0= 
8 
Under-side of fore-wing without red markings before apex 7 = 88 % 
Under-side x with 5 5 1=12 7 
8 
