DIESTOGYNA. By Dr. C. Auriyillius. 
159 
C. Concordia Hopjf. (46 f.). Both wings above light bluish grey with violet tinge and black markings; roncordia. 
the forewing with black transverse lines in the cell and at its apex and with three transverse rows of black 
spots, of which the first is absent or only weakly developed in cellules 1 a and 1 b; the hindwing has also behind 
the cell three rows of black spots, of which, however, the first is sometimes absent or only indicated. On the under 
surface both wings have the ground-colour yellow, a postdiscal row of rounded black spots and a row of black 
submarginal streaks; the cell of the forewing is without markings, but that of the hindwing has 3 or 4 black 
transverse streaks; for the rest the hindwing is more or less blue-grey in the middle and lias blue-grey stripes 
between the postdiscal spots and the marginal streaks. Angola, Zanzibar, Nyassalancl and German East Africa. 
8. Genus: IMestogyna Karsch. 
The numerous species of this genus are still very imperfectly known, but are among the most interesting 
of the Ethiopian Nymphalids. The sexes are quite dissimilar and hence their identity is still uncertain in some 
cases. On account of the often indistinct and confused markings the species are difficult to describe and the dark 
iridescent colours also cannot be quite faithfully reproduced in figures. In this comprehensive work it has 
been possible to me, through the kind cooperation of the publishers, to have nearly all the known species figured 
in both sexes. By this means it is hoped that the determination of the species will be much facilitated. 
In the <$<$ the wings are short and broad; the forewing has the costal margin convex and the distal margin 
straight or rarely somewhat excised and still more rarely convex. The anal angle of the hindwing is often some¬ 
what produced or elongated, but may also be quite rounded; in this case the distal margin is often almost entirely 
straight between veins 2 and 6. The markings of the upper surface are really the same in all the species, 
but are often indistinct or run together. There occur, as is best shown hi the figure of nigropunctata 
(38 b), on the forewing two black rings in the cell and one at its apex, and five blackish transverse bands 
or rows of spots, vertical to the hindmargin, of which the first is only present between the hindmargin and the 
base of cellule 2, and is often united with the second band; the fifth band corresponds to the submarginal 
line; at the distal side of the third band are often placed small white dots in cellules 4—-7. On the hindwing 
the basal part is darkened and behind the cell are placed three dark transverse bands, corresponding to the 
three distal transverse bands of the forewing. On the under surface there is on both wings, or at least 
on the hindwing, a distinct basal area, sharply defined distally, the size and shape of which is of the greatest 
importance as a means of distinguishing the species. 
The $$ are always larger than the $$ and have the forewing more elongate, with the apex sharper 
and the costal margin less convex; the hindwing is nearly always rounded at the anal angle. In some species 
the same dark transverse bands are present above as in the but in the majority these are indistinct 
and the forewing has a light oblique transverse band; the hindwing and the basal part of the forewing are 
often light coloured or the hindwing has a light median band; the basal area on the underside of the hindwing 
usually agrees exactly in shape with that of the and it is often by this alone that it is possible to come 
to a decision as to the identity of the sexes; the dark transverse rows of the upperside of the hindwing are 
in the often modified on the underside into a curved row of large dark rings or elongate eye-spots. The 
antenna is very long in both sexes and in the $ especially reaches far beyond the apex of the cell. All the species 
are peculiar to the great forest tracts and are distributed from Sierra Leone to Uganda and Kavirondo, but 
are entirely absent in South and East Africa and on Madagascar. Unfortunately their earlier stages are entirely 
unknown. 
The numerous species can be divided into two natural and easily distinguished groups according to the 
shape of the basal area on the underside of the hindwing. 
First Group. 
The basal area on the under surface of the hindwing is triangular, distally bounded by a straight or nearly straight 
line, which extends from the costal to the inner margin or at least to vein 1 b and is there sometimes angled. The have 
almost all a Catuna -like pattern. 
D. camarensis Ward (39 d). In the G both wings above have a bright greenish blue reflection as far camarensis. 
as the broad black discal band; the cell of the forewing, however, with the usual black transverse markings; 
distally to the black discal band follows a blue transverse band and before the distal margin the forewing has 
one blue transverse line and the hindwing two; the distal margin of the forewing is nearly straight and the 
hindwing is a little prolonged at the anal angle. The under surface of both wings is bright orange or somewhat 
brownish yellow, not darker in the basal part; the forewing has in the middle two brown transverse lines, which 
are approximated towards the hindmargin and terminate at vein 1; close beyond the distal line is placed 
a weakly curved transverse row of 5 or 6 rounded black spots; the basal area of the hindwing is unicolorous 
with a black dot in the cell and is distally bounded by a thick transverse line, nearly straight between the costal 
margin and vein lb; in the distal half there are only some indistinct brown dots. The $ is larger than 
the (U having an expanse of 55—60 mm.; the under surface is light yellow, but marked quite as in the <$; the 
upper surface strongly recalls that of goniogramma $, but has the dark transverse bands of the forewing broader 
and _more continuous, the yellow median band of the hindwing broader and more triangular, and quadrate 
