Revision of the Genus Hrebia. 201 
form of an obscure spot sometimes occurs in Norwegian 
disa, and therefore I am not able on the strength of three 
or four specimens of the male sex only to admit mancinus 
as a marked variety. 
Disa, var. mancinus, is also recorded by Edwards and 
Strecker from Alaska, but I have been unable to obtain 
any specimens from there for comparison. The typical 
disa markings on the underside of the hindwing are not 
so distinct on the American as in the European specimens, 
and the form of the genitalia is identical. 
Now, when we turn to embla, we find it local in Southern 
Norway, where Schoyen takes it in Odalen near Christiania 
in June; and Siebke says it was taken by Wocke at 
Sigstad in the parish of Loiten in Hedemark on May 30. 
Wallengren states that in Sweden its most southerly 
habitat is in Dalarne, where Quensel found it at Serna, 
that it occurs at Lycksele in Umea Lappmark, at Jockinock 
and Storsand, and at Ofre Tornea in Tornea Lappmark, 
and as far north as Karesuendo. I have specimens taken 
by Lampa near Quickjock which in marking are very 
distinct from disa and as the ranges of disa and embla here 
overlap, it is possible that the two species may here be 
-separated ; it would be very interesting to have further 
particulars as to their occurrence together or separately. 
In Finland Schilde found emb/a common on bushy moor 
meadows from the end of June to the middle of July, and 
says it is very variable, sometimes losing all the ocelli 
except those in cell 4 and 5 of the forewing. I have 
specimens from St. Petersburg and from Olonek, and then 
I know of no record of its occurrence until the province of 
Irkutsk is reached, where, as I have already said, the 
hindwing below shows a transition to disa. M. Alphéraky 
tells me that the collection of the Grand Duke Nicholas 
contains no disw from Siberia; and though Ruhl gives 
Irkutsk as a locality, he is probably only quoting Ménétries. 
In the mountains near Urga on the Mongolian frontier 
a variety occurs which Staudinger calls Jama, but this is 
not, so far as I can judge from the pair he sent me, to be 
distinguished from Norwegian specimens. 
Alphéraky also describes in Romanoff’s “ Mémoires,” ix, 
p. 325, from Kamschatka a variety of embla which he calls 
succulenta and he has been good enough to send me four 
males and two females; excepting that the ocelli are more 
TRANS. ENT. SOC. LOND. 1898.—PARTII. (JUNE.) 14 
