662 
APPENDIX 
rows of scales on the wings run, as usual, uninterruptedly, almost straight 
—being only slightly curved towards the base of the wing—across the 
veins, on which the scales are more crowded than elsewhere. Here, on 
the vein between every pair of rows of ordinary scales lies a group of 
scent-scales in a densely packed transverse double row (PI. H, Fig. 4). 
In Golaenis julia , male, the scent-scales of the hind-wing are confined 
to the veins 7 and 8, which are covered by the fore-wing : they are especially 
numerous on 7, the first branch of the subcostal, and are here arranged 
as in Golaenis \_Metamorpha~\ dido. But besides these, there are scent-scales 
on the fore-wing also, on veins 1-3, which even at this stage show an 
arrangement recalling that of D. vanillae. Only the scales of every other 
row curving towards the base of the wing, run uninterruptedly across 
the veins and the scales which lie actually on the veins are longer, 
narrower, and more closely packed than elsewhere, and overhang a semi¬ 
circular, somewhat depressed patch, covering about two-thirds of the 
breadth of the vein, a patch which is densely packed with scent-scales 
(PL H, Fig. 5). 
In Dione juno , male, the scent-scales appear to be wanting from that 
part of the hind-wing covered by the fore-wing. It is true that a few are 
sometimes found among the scales taken from that area, but I could never 
determine whether they had been really inserted there. They do, how¬ 
ever, occur both on veins 2-6 of the hind-wing and 1-6 of the fore-wing, 
being arranged as in Golaenis dido. Where they are especially numerous, 
as on the inner marginal [submedian] vein of the fore-wing, the rows of 
scales are more strongly curved and on the vein the groups of scent-scales 
contain more rows, so that the arrangement approaches that of the fore¬ 
wings of Golaenis julia. 
Finally, in Dione vanillae , male (PL H, Fig. 3), the scent-scales are 
confined to veins 1-6 of the fore-wing. On 1, the inner marginal 
[submedian] vein, they occupy the distal two-thirds of the length, on 2, 3 
and 5 the whole length, on 4 they are prolonged basally beyond the end 
of the cell, while on 6 they begin a little beyond the cell. In this species 
only every third row of scales runs uninterruptedly across the scent-scale 
bearing veins, and is strongly curved towards the base. About half of 
the space between every two of the rows which cross the veins is occupied 
by a patch of densely packed scent-scales, extending beyond the vein on 
each side. 
As in the arrangement, so also in the shape of the scales, Golaenis julia 
forms a transition between Golaenis dido and Dione vanillae. The scent- 
scales of the hind-wing (PL H, Fig. 6 A) resemble closely, both in arrange¬ 
ment and shape, those of Golaenis dido , while those of the fore-wing 
(PL H, Fig. 6 B), almost twice as long, far more slender, and contracted 
into a neck below the apex—to some extent recall by their shape the 
scales of Dione vanillae. 
In this last species the long, rod-like scent-scales (Pl. H, Fig. 7) attain 
