mundula. 
gonio- 
gramma. 
ribensis. 
obtusangula. 
butleri. 
160 DIESTOGYNA. By Dr. C. Aueivilltus. 
black submarginal spots on the hindwing, clistally not or scarcely light bordered. Cameroons to the Congo. 
D. mundula Griirib. is a recently described species, unknown to me, but said to be nearly allied to ca¬ 
viar ensis and described as follows: $. Shape of the wings as in goniogramma; the hindwing at the anal angle 
less pointed than in caviar ensis , more broadly rounded, hence with the blue and black-brown stripes less upright, 
more horizontal; otherwise the markings of the upper surface agree with those of camarensis, the discal band 
(= distal boundary of the basal area) on the hindwing bent in an acute angle below vein 1 b and basally 
extending to the inner margin, while in camarensis it is either entirely absent or only indicated. $: on the upper 
surface only distinguishable from camarensis by the yellow discal band of the hindwing, which is narrower 
(at the broadest part, at vein 6, only 4.5 mm. in breadth) and directed somewhat more steeply towards 
the distal part of the inner margin, so that the dark stripe of the ground-colour between the distal edge of the 
band and the yellow submarginal line is not materially widened towards the inner margin; moreover the sections 
of the submarginal band between the veins are more strongly angled than in camarensis ; under surface somewhat 
duller grey-yellow, with the markings somewhat weaker, otherwise as in camarensis , except that in the $ the 
bend in the discal band of the hindwing to the inner margin is more decided. Cameroons and Spanish Guinea. 
D. goniogramma Karsch (39 d) is the smallest species of Diestogyna and differs in shape from all the 
others in having the distal margin of the forewing in both sexes weakly rounded. In the the black transverse 
bands of the upper surface are distinct, sharply defined and separated by blue or violet lines, the fourth trans¬ 
verse band is broken up into rounded, black, blue-ringed spots, before the apex of the forewing there are often 
(not always) three small white subapical dots in cellules 4—6; the under surface differs considerably from that 
of camarensis, the ground-colour being tawny and the basal area of both wings distinct on account of its 
somewhat darker colour; the basal area of the forewing extends to beyond the middle of the wing and is clistally 
bounded by a brown transverse line, obtusely angled at vein 4; the basal area of the hindwing is relieved 
with grey in the middle, with a black dot in the cell, and is distally bounded by a straight dark brown 
line, basally broadly margined Avith whitish grey; the large submarginal eye-spots in the distal half are rather 
indistinct, only the white dots at their proximal side standing out sharply. The $ differs above from the $ 
in having the blue transverse lines replaced by yellow and especially in having the transverse line between 
the second and third black band on the hind wing developed into a broad yellow median band, which is widened 
anteriorly; the under surface is much lighter than in the $, but otherwise quite similarly marked. Cameroons 
and northern part of the Congo region. 
D. ribensis Ward (= acutangula Auriv. 39 e) was described from a specimen said to come from Ribe 
in East Africa and afterwards identified in all collections A\ r it h a nearly allied species from the Cameroons. Hence 
I was misled into redescribing the species. But a comparison of acutangula Auriv. with the figure of ribensis 
in Ward’s very rare work ,,African Lepidoptera“ has convinced me that both belong to the same species and 
that consequently the folloAving, hitherto regarded as ribensis, is another, unnamed species. The £ has distinct 
black transverse bands above, separated by light lines with a violet reflection; the broad, second dark trans¬ 
verse band of the forewing projects sharply distad at vein 4, forming a right angle or an acute angle, which 
is especially distinct on the under surface; the under surface is dark brown, the basal areas relieved with 
whitish grey in the middle; the basal area of the hindwing is distally bounded by a dark line, irregularly and 
feebly curved, its general course nearly straight. The $ recalls those of the preceding species above, but differs, 
in having the second yellow transverse band rather strongly widened not only on the hindwing but also in cellules 
1 a—-2 of the foreAving; on the hindwing, however, it is still not so Avide as in camarensis, but measures here only 
about 5mm.; in cellule 1 b of the forewing it has a breadth of 2.5 mm.; on the under surface this band is also 
Avell expressed, but is lighter, whitish yelloAV, and indistinctly defined distally; the dark basal area consequently 
stands out much more sharply in the $ than in the <$. British East Africa: ,,Ribe“ and Uganda. The species 
has not to my knoAAdedge been found again in the coast regions of East Africa, and hence it seems somewhat 
doubtful whether it really occurs there. 
D. obtusangula spec. nov. (= ribensis 39 d) is very similar to the preceding species, but differs in both 
sexes in having the second dark transverse band of the hindwing at vein 4 distally rounded or only very ob¬ 
tusely angled. In the A the light transverse lines of the upper surface are thick and bright blue and the 
basal area on the underside of the hindwing is distally margined with violet-grey; the forewing beneath is 
somewhat tinged with yellowish at the hindmargin and the blue transverse markings on the upperside of both 
wings are represented by Adolet-grey transverse lines or shades. Cameroons. 
D. butleri Auriv. (= amaranta Btlr. £) is only known in the female. It very nearly approaches the $ 
of ribensis, but has much narroAver yelloAV transverse lines on the upper surface; the first of these is absent 
or very indistinct; thus the basal half of both wings has become almost unicolorous dark broAvn, some 
light transverse lines being present only in the cell of the foreAving; distally the basal half is bounded by 
a sharply defined, continuous, feebly curved transverse band, extending from vein 7 of the forewing to 
