308 Dr. Frederick A. Dixey on the 
on the underside of the hindwing. We may, perhaps, 
regard all three genera as relics of an ancient fauna of 
the Eastern Hemisphere coeval with the earliest forms 
represented by the present Delias stock, and anterior to 
the various branches which have diverged from that 
genus or from Metaporia. The precostal orange suggests 
a kinship with Delias on the part of Mylothris, though 
no such link exists in the case of the other two genera, 
and, as pointed out by Mr. Trimen, who considers 
Mylothris and Thyca (Delias) to be allied genera, the 
former genus, like the latter, undoubtedly contains 
subjects of mimicry by Pierine of other groups. Thus, 
‘The imitation of M. agathina by P. thysa, Hopff., is 
deceptively close in both sexes, and M. poppxa, Cram., 
is similarly copied by P. rhodope, Fabr., on the West 
Coast. MM. agathina is also mimicked by the female 
Hronia argia, Fabr.’’* 
We now have to deal with the genus Belenois, which 
presents some special difficulties. In the first place, we 
find an assemblage of species (B. lasti, B. nagare, B. 
majungana, and B. isokart) from Hast Africa and Mada- 
gascar, with respect to which Messrs. Grose Smith and 
Kirby, after noting that they are now placed with Phris- 
sura in the Collection of the British Museum, go on to 
observe that they “ differ entirely in neuration from the 
types of Phrisswra, agreeing in this particular with 
Belenois, in which genus we prefer to include them.’’+ 
The type of Mr. Butler’s Phrissura is apparently 
P. illana, Feld.,t and in 1872 (Proc. Zool. Soc., 1872, 
p- 51) the only other species of Phrisswra admitted by Mr. 
Butler was P. palisma, which is undoubtedly a very near 
relative of P. illana. Both of these species offer differ- 
ences in neuration from B. lasti and its allies.|| Now, 
* South African Butterflies, vol. iii., p. 39 (1887). 
+ Rhopalocera Exotica, Oct. 1892. 
~ Mr. Butler first gave it as P. cynis (Cist. Entom., iii., 1870, 
p. 49), but afterwards corrected it to P. illana (Trans. Ent. Soc. 
Lond., 1871, p.171). Mr. Distant has since made cynis the type 
of his new genus Udaiana. (Rhopal. Malayan., 1882—1886, p. 286 
and note). 
|| In P. illana (forewing) the discoidal cell is unusually short, 
the second subcostal starts from the end of the cell, and the 
second and third median nervules come off near together; in 
B. lasti the cell is of the ordinary length, the second subcostal is 
emitted before the end of the cell, and the second and third 
median nervules do not start particularly near together. 
