254 Dr. Frederick A. Dixey on the 
not furnished with a spot at all; and that the largest and 
best-marked member of the group, namely that between 
the second and third median nervules, corresponds with 
the spot which we saw to be most persistent in the males 
of G. brassice, rape, and napi. This spot, moreover, as 
well as the next most persistent (that between the 
first median and submedian), is usually picked out with 
black on the underside of both S. callidice and S. daplidice, 
where the markings corresponding to those of the upper 
surface are, as a rule, chiefly composed of green or yellow 
scales with but small admixture of black. The hindwing 
of WS. callidice 2 shows a continuation of the series; 
though here the markings as they approach the inner 
margin tend to assume the appearance of chevrons rather 
than of spots, which tendency is still more marked on the 
underside. 
The South American genus TYatochila presents the 
same series on both fore and hindwings, the females as a 
rule most completely (as in 7. autodice). The male of 7’. 
theodice, however, exhibits the whole series quite plainly ; 
and in both of these species the markings in question 
tend to assume the form of a line of chevrons, the apices 
of which point towards the margin of the wing, instead of 
towards the base, as in SN. callidice. 
I propose to distinguish this series of spots as 8 
(for Submarginal), numbering the constituent markings 
according to the interspaces they respectively occupy. 
In all the forms as yet mentioned the full number of 
marginal interspaces, from the costal nervure to the anal 
angle, is in the forewing 11, in the hindwing 8. Another 
space may be reckoned in the hindwing, that, namely, 
between the costal margin and the costal nervure. The 
corresponding space in the forewing is exceedingly narrow, 
and never carries a separate spot. We may take then 
the number of spaces potentially containing spots as 11 
and 9 in the fore and hindwing respectively, and may 
designate all possible terms of the series as 8S 1—20, 
beginning at the costa of the forewing. None of the 
species above referred to exhibits the whole range of spots 
from | to 20 in a discrete condition, sone being generally 
absent and others fused ; the series may, however, be seen 
complete on the upper surface of the forewing and lower 
surface of the hindwing in many specimens of Callidryas 
philea and C. thalestris 2 (Fig. 22,5 1—11). 
