Review of the Genus Erebia, 229 
but they give the clue to the real nature of the append- 
ages of medusa; since in them the resemblance to those of 
stygne is considerable, whilst the ordinary form of clasp in 
medusa is more simple. The open side comes close to the 
head, which has but a few styles along its upper margin 
and looks as if it would like to be rid of them; the lower 
portion of the head is rounded as in tyndarus, the whole 
style being straight. We find, however, that the butterfly 
has much superficial resemblance to #. hewitsonii, and 
that these two species agree in having Asiatic neuration 
(10Sout of 7) rarely in the male, not unfrequently in the 
female, and are therefore clearly intermediate between 
Sections A and B, 
2. LE. hewitsonii (Fig. 42) agrees with medusa 
very much in its facies and also in its neuration. The 
tegumen is much larger and bolder, as 8 to 2. The clasp 
has much the same general form, the open side extending 
close up to the head, which however is much larger, set at 
a considerable curve to the body and clothed with quite 
a helmet of large styles. In these respects it resembles 
the forms found in Section B rather than those of 
Section A. 
SECTION B. 
We have already seen that the neuration characteristic 
of this section occurs in Section A, in ZL, evias, which has 
probably no relationship with Section B, and in ZL. medusa, 
which possibly is related to a portion of Section B, and 
E. hewitsonvi, which I should have placed in B, but for its 
apparent connexion with medusa. 
Some species in Section B have the characteristic 
venation in no greater degree than medusa has, 10 some- 
times arising from 7 and sometimes not, whilst in others 
10 arises so far along 7 that it can hardly ever be separated 
from it even in extreme varieties. 
I desire, so far as is reasonable, to give especial weight 
to the indications afforded by the appendages, and there- 
fore perhaps I incline to note the value of neuration when 
it confirms them, and to neglect it when it does not 
accord; and so here I do not follow the neuration alto- 
gether, but rather the clasp indications. It may therefore 
be well to give precisely the neurations observed. 
In the great mass of the European Section veins 6, 7 and 
