Review of the Genus Hrebia. 233 
discoidalis, but it has a very special and distinctive aspect, 
so that its absolute identity in fasciwta, erinna, and 
magdalina leaves no doubt that these are all forms of one 
species—a conclusion that is not disturbed by any observable 
differences in them, when once their identity is asserted. 
2. H. parmenio (Fig. 54). This form has 
probably little in common with the last species; it has 
a peculiarly broad square, squat clasp. 
3. L. afra (Fig. 55). Another short, kroad, 
squat clasp, which is however not of the same character 
as that of parmenio; in outline on lateral view, it is not 
unlike that of wme or lappona, and if we could assume 
Asiatic neuration to be independently acquired, the species 
might be placed on its clasp form near lappona. The 
great size and length however of the upper process of the 
tegumen make this hypothesis untenable. 
The three species in this group ought perhaps to have 
been placed each in a separate group, as they have not 
much in common. 
I place by itself H. myops (Fig. 56), whose right to be 
regarded as an JLyvebia I disallow. The form of the 
tegumen suggests an alliance with Cenonympha. 
Another group that are not Erebias but are well on the 
way to Callerebia, are maracandica (Fig. 57), jordana 
(Fig. 58), hades (Fig. 59) and one or two other named 
forms. Their appendages are more like those of Callerebia 
than of Hrebia, and their facies is different. 
Herse (Fig, 60) is another species, with a very remark- 
able clasp form, that seems not to be an Lrebia. 
By showing the identity of erinna, fasciata, and magda- 
lina, there is demonstrated a parallel to the case of 
glacialis even closer than that which the similarity of 
magdalina in so many respects to var. pluto, had led 
Mr. Elwes and others to draw. In showing also the 
identity of melas with nerine, and the close relationship 
though probably not specific identity of pronoe and lefe- 
bvret, I enlarge the number of examples in which 
geographical isolation has had the effect of establishing 
very marked varieties or incipient species, varieties that 
often differ more than distinct species do; yet, geo- 
graphical isolation only having operated, the form of the 
appendages remain unchanged and the species may remain 
