238 THE ENTOMOLOGIST’S RECORD. 
coridon consists of two species. I. The northern single brooded coridon, 
with which he associates hispana, the brilliantly tinted Spanish form, 
and JJ., the more southern double-brooded form, as found on the 
Riviera, which he identifies with the large pale Spanish arragonensis, 
which name he attaches, but calls it aragonensis, to the new species, as 
the oldest name of any of its forms. 
To support this conclusion he brings forward one very important 
new observation, and several minor facts of marking and coloration. 
He found in the neighbourhood of Florence and other localities in 
Tuscany, that there were three emergences of coridon, one in June, one 
early and one late in August. The June and late August (and Sep- 
tember) emergences were of a double-brooded form, and the early August 
one of a single-brooded one. Dr. Verity says that the facies of these 
two forms is so different that he can at once distinguish them. The 
single-brooded form is coridon, Poda, the double-brooded, which he 
considers of the same species as the double-brooded Riviera form and 
as the Spanish arragonensis,® he distinguishes under the latter name but 
varies it. 
The occurrence in the same locality of the egg-hibernating, single- 
brooded and of the larva-hibernating double-brooded form, is un- 
questionably a strong piece of evidenee that they are distinct species. 
That they should have a different facies would no doubt be the case, 
whether they were or were not one species. 
As to actual structural differences between the two forms, Dr. 
Verity mentions in the first place that in aragonensis the radial veins 
are shorter than in coridon, and consequently the wings in aragonensis 
are shorter, broader, and more acuminate than in coridon. The margins 
of the wings are more convex, and these two facts taken together give 
rise to a difference in the form of the interneural spaces, and of the 
relations to each other of the spots proper to them. 
There is no difficulty, I find, in selecting examples of either form 
that present quite the opposite wing forms, but taking half-a-dozen 
(perhaps hardly enough) specimens of each at random, I find that the 
six consisting of two arragonensis, two of the spring and two of the 
summer brood of the Riviera race, the ratio of length of costa plus 
length of inner margin to length of hind margin is 2°64, varying from 
2:52 to 2°76, and of the six coridon, consisting of two Enelish, two 
Swiss ?, and two hispana, is 2:72, varying from 2:5 to 3:0. This con- 
firms Dr. Verity’s observation ; of course the relative ratios may be more 
pronounced in the Tuscan forms, but Dr. Verity gives no numerical 
data. 
It must be noted, however, that the arraygonensis (Spanish form) 
and hispana in this calculation are adverse to Dr. Verity’s position, the 
arragonensis having larger and sharper wings than hispana, the figures 
being arragonensis 2°72, hispana 2°55, but leaving these out, we have 
for aragonensis 2°6, and for coridon 2°9, still more confirmatory of Dr. 
Verity’s observatious. 
In colour and marking, he notes the ground colour beneath in the 
male to be, in coridon, white or very pale pearly grey in the forewing, 
very pale reddish to dark chestnut in the hindwing, and whereas in 
6 We have no actual knowledge whether one or both hispana and arragonensis 
are single- or double-brooded.—T.A.C. 
