Publ. 22. IV. 1912. 
DIESTOGYNA. By Dr. C. Aurivillius. 
169 
are distinct, the upperside of the hindwing has a broad light yellow median band, anteriorly much widened, 
which reaches both the costal and inner margins and in cellules 4—6 is joined to the thick yellow rings of 
the postdiscal spots; the submarginal line thick and black here also; the blackish basal part is distally broken 
up into spots; the under surface is grey mixed with whitish and at the distal margin darker brownish; 
the basal area of the hindwing is rounded quadrate, distally dentate, only in parts darker than the ground¬ 
colour, and encloses a large, rounded black spot in the cell. Congo: Stanleyville. 
D. amaranta Karsch (38 f). It is unfortunately very uncertain whether the sexes figured here really amciranla. 
belong together. The A> which was first described, has the ground-colour dark coffee-brown above, with a dark 
velvety blue gloss throughout except at the costal margin of the hindwing; the forewing with three light 
blue transverse streaks in the cell and three bluish subapical dots before the apex; the black submarginal line 
is rather indistinct on both wings; beneath the ground-colour is very dark coffee-brown with the distal half of 
the forewing much lighter and at the costal margin densely sprinkled with violet-grey scales, at the costal margin 
in the dark basal part four violet-grey transverse streaks; the basal area of the hindwing is blackish, distally 
curved and bordered by some violet-grey spots, of which only the one in cellule lc is somewhat larger; the 
postdiscal spots are only indicated by light dots; fringes of both wings white. The $ is marked almost 
exactly like that of gambiae above, but differs in having the spots of the transverse rows on the forewing 
united into transverse lines and in the light yellow median band of the hindwing extending very nearly 
to the costal margin; the under surface on the contrary is entirely different and most recalls the underside of 
D. ernesti-baumanni $; the basal areas of both wings are black-grey, their distal boundary sharply defined, 
and exactly meeting at the hindmargin of the forewing and the costal margin of the hindwing; that of the 
forewing is emarginate between vein 2 and the hindmargin and that of the hindwing in cellule 4; the ground¬ 
colour of the distal part is light grey-yellowish and especially towards the distal margin striated with 
brown, the distal margin of the forewing is broadly darkened with red-brown behind the apex as far as vein 3; 
the basal part of cellule 4 on the hindwing is entirely without dark spot. Cameroons and Uganda. 
D. gambiae Feisth. (37 a) is a long known, widely distributed and very distinct species; the hindwing in gambiae. 
both sexes has short, obtuse lobes at veins 2 and 3. The A is red-yellow above with black transverse markings 
and strongly recalls the A of amicia ; the broadly darkened hindmargin of the hindwing, however, is posteriorly 
sharply separated from the ground-colour; the forewing is bright orange beneath, at the costal margin darkened 
and grey-scalecl for the breadth of the cell; the hindwing beneath has a very broad blackish red-brown costal- 
marginal band, sparsely scaled with grey at the margin, and a narrower distal-marginal band, which is 
sharply bounded proximally by the submarginal line; the basal area is coloured like the costal band, but 
has a broad light yellow transverse band, extending from the inner margin to the anterior margin of the cell; 
the rest of the wing has the ground-colour yellow, but is very broadly suffused with brown-grey in the middle. 
The $ is marked almost like the A beneath, but has a lighter ground-colour and is only very little suffused 
with grey in the middle of the hindwing; the upper surface on the contrary is cpxite different: the forewing 
is black-brown with four light yellow or grey-yellow transverse streaks in the cell and four transverse rows 
of light yellow spots or streaks beyond it, of which the first touches its posterior angle and the last, before 
vein 5, is indistinct; the hindwing is black-brown above- and has between veins 3 and 7 a very large 
light yellow median spot, which in cellule 5 attains a breadt h of about 10 mm., but narrows rapidly posteriorly. 
Senegal to the Cameroons and the Congo. 
Third Group. 
The species of this very natural group differ from all others in having the basal area of the hindwing large and 
at its hinder angle widely produced posteriorly and ending in two points; these are placed on veins 2 and 3. In addition the under¬ 
side of the hindwing has behind the costal margin a light stripe extending from the base to the apex and crossing the 
basal area. The light oblique band on the upperside of the forewing, which characterizes the $$, is in this group more 
or less distinctly developed in the (VS also. 
D. ampedusa has almost the same markings as atos-sa beneath, but all much duller and more indi¬ 
stinct and the ground-colour more violet-grey; the upper surface has a dark yellow ground-colour, which, 
however, shows up but little between the broad black transverse markings and in the basal part especially 
is indistinct. -—- ampedusa Hew. (37 b; both figures are unfortunately too light). In the A the oblique band ampedusa. 
of the forewing is not lighter than the ground-colour and not more sharply defined than the other light 
transverse bands, in the $ it is pure white on both surfaces. Gold-Coast to Old Calabar. —- leonis Auriv. leonis. 
(37 c; 40 a) only differs in having the oblique band of the forewing in the A upperside sharply defined and 
more brightly coloured than the transverse bands and in the $ light yellow on both surfaces. Sierra Leone. 
D. atossa (37 a, b). In the A both wings are rust-brown above with black marginal band and atossa. 
black submarginal line; the forewing has in addition two black transverse bands, of which the first only reaches 
vein 2 and the other is more or less united with the submarginal band and, gradually narrowing, reaches the 
hindmargin; the under surface, as the figure shows, is variegated with a mixture of purple-brown, yellow, 
orange and whitish grey. The $ is much larger and on the upper surface has the basal half of the forewing 
and the hindwing as far as the black marginal band bright orange-red; the apical half of the forewing is 
black with a large white apical spot and white oblique band, the latter, however, broken up into spots, as the 
XIII 
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