Pull. 15. III. 1912. 
DIESTOGYNA. By Dr. C. Aurivillius. 
161 
vein lb of the hindwing and in cellnle 2 of the forewing suddenly widened to a breadth of 4mm., but other¬ 
wise only 1—2 mm. in breadth; beyond the middle there are on the forewing 2 and on the hindwing 3 yellow 
transverse lines; the under surface is similar to that of the 9? °f ribensis and obtusangula and the basal 
area of the forewing is distally rounded at vein 4 as in the latter species. Toro. 
D. luteostriata Baker (39 e) is likewise only known in the female. It approximates in markings to the luteoslri- 
preceding species, but differs very considerably in that the first yellow transverse line on the upper surface is a,(L 
broad and sharply expressed and the second forms two large yellow spots on the fore wing, one placed in cellule 
lb and almost quadrate, the other in cellule 2 very long, extending to the yellow submarginal line; the 
broad black discal band is almost entirely interrupted by the first spot and the outer transverse band by the 
second; both wings beyond the middle only with two yellow transverse lines; the under surface is light brownish 
with a dark dot in the cell of the hindwing; the basal area of the forewing is feebly curved distad between the costal 
margin and vein 2, in cellule lb deeply incised; the basal area of the hindwing is large, distally quite straight 
and margined with whitish; the postdiscal oval spots are large, white-ringed, distinct and complete, only the one 
in cellule 2 of the forewing is incomplete (proximally obliterated by the yellow spot). Congo region: Beni- 
Mawambe. 
The two following species differ somewhat from the preceding ones of this group in the form of the basal area on the 
underside of the hindwing; this area is somewhat longer at the costal and somewhat shorter at the inner margin, so that 
its distal boundary-line becomes more oblique. In the 77 the markings on the upper surface are less distinct and in the 
only known 9 they differ very much from those of the preceding species, more approaching the pattern of many 99 of the'' 
second group. The hindwing in both sexes is distinctly, but broadly and obtusely produced at the anal angle. 
D. duseni Auriv. (39 f). both wings above dark grey-brown with dull bluish reflections, which are duseni. 
especially manifest in the distal part of the forewing and along the middle of the hindwing; the dark transverse 
bands, with the exception of the discal band on the forewing, are scarcely indicated; in the cell of the forewing 
the usual light transverse bands are rather distinct. The basal area of the forewing beneath is distally pretty 
uniformly curved, at veins 2 and 3 shortly dentate and margined with light yellowish; the basal area of the hind¬ 
wing is dark chestnut-brown, distally almost straight but somewhat irregularly defined and especially towards 
the inner margin bordered with grey-violet; the postdiscal ring-spots are indistinct, but proximally marked 
by white dots; these dots are also present in cellules 3—7 on the fore wing; the basal area of the hindwing 
nearly reaches the white dot in cellule 7. The $ is much larger than the <$ and one of the largest Diesto- 
gyna 9? known. Only one specimen (from Staudinger’s collection) is known to me, and this is unfortunately 
damaged on both the forewings. The wings have the ground-colour above dark grey-brown, in the basal part darker 
and more reddish brown; the forewing has two large, obliquely placed yellow spots in cellules 2 and 3, which 
apparently correspond to a part of the oblique transverse band in the $$ of the second group, and 4 white 
subapical dots; the cell with the usual curved transverse lines in the middle and at the apex; hindwing above 
with a broad yellow median band between veins I b and 7, not sharply defined distally and in cellules 4—6 
so much widened that it reaches the distal boundary of the eye-spots; the under surface marked almost as the 
upper, but the spots in cellules 2 and 3 of the forewing nearly white and the basal area of the hindwing 
ornamented with some violet-grey nebulous lines and distally bounded by a white median band about 2 mm. 
in breadth. A very rare species, hitherto only known from the Cameroons. 
D. romi Auriv. (39 f). Of this fine species only the <$ is known. The wings above with a beautiful romi. 
blue reflection, without dark transverse bands, in the cell of the forewing black with blue transverse lines and at 
the distal margin black; fringes snow-white; on the under surface the basal area is deep black-brown, distally 
bordered with violet-grey; its edge on the forewing is somewhat irregular, but towards the hindmargin almost 
vertical, on the hindwing almost straight; the eye-spots are only indicated by white dots; the distal part is 
dark reddish brown, at the anal angle of the hindwing suffused with violet-grey. Congo region between 
Kasongo and the Stanley Falls. 
Second Group. 
The basal area on the underside of the hindwing is rounded or quadrate, the line which bounds it distally being 
curved or usually angled at vein 3 or 4. A division of this extensive group into subgroups according to the markings of the 
99 is here provisionally attempted, but is defective inasmuch as the 99 of several species are still unknown or their identity 
with the 77 is not altogether beyond doubt. 
First Subgroup. 
Apex of the forewing in the 9 not white. Forewing above and beneath in the 99 with a light, obliquely placed trans¬ 
verse band, which arises from the middle of the costal margin, is directed towards the hinder angle or the distal margin and usu¬ 
ally reaches vein 2; this oblique band consequently consists as a rule of 5 spots, one in each cellule from 2—6; the spots 
in cellules 4—6, however, are often small or indistinct and the one in cellule 2 is sometimes separated from the rest or forms 
an angle with them. By this peculiar transverse band, which is entirely absent in the 77 , the 99 of this subgroup are easy 
to recognize. The 77 above with black-brown ground-colour and black transverse bands or unicolorous black with or 
without blue markings and blue reflection, but never with red-brown or yellow-brown ground-colour or transverse bands. 
XIII 
21 
