COSSUS. By M. Gaede. 
541 
M. rudis Aur. (79 a). Dark reddish-brown and greyish-brown. Patagia and base of abdomen dingy 
white, the latter with a blackish dorsal and lateral stripe. On the forewing the base as far as the centre of the 
cell and behind the cell more than half as far as the apex whitish. Spots at the costal margin, and the rest 
of the fore wing dark brown with reticulate light patches. Hindwing in the distal half also reticulate lighter. 
75—120 mm. South West Africa, Congo. — Cossus toluminus Drc., from Senegal, is probably the same species, 
and this name would then be prior to rudis. 
2. Genus : Cossus F. 
Antennae of <$ shortly bipectinate. Hind tibiae with 2 pair of short spurs. Wings broad, coarsely 
scaled. In the forewing veins 3—5 equidistantly separated, 6 from the lower angle of the inserted cell, 9 mostly 
from the stalk of 7 + 8, this stalk and vein 10 close together, 11 free. In the hindwing vein 8 is not connected 
with the cell by a bar, 6 and 7 close together. Type: cossus L. from Europe, with a slightly different neuration. 
C. cirrilator Le Cerf (79 a). A species remarkable for its size. Thorax white, with black and brown 
scales and 3 black spots. Abdomen laterally brownish. Forewing brownish-white. Costal margin near the base 
with brown streaks, behind the centre 3 large spots. The small streaks extend posteriorly to below the centre 
of the wing. Distal area spotted as far as the middle, with fine black reticulated lines, two strong lines above 
vein 4 forming an X. At the base of the wing near vein 1 c two black dots besides. Hindwing greyish-brown, 
at the margin darker. In the forewing vein 9 long-stalked with 7 + 8. In the hindwing veins 6 and 7 from the 
same place. B 74 mm. Madagascar. 
C. terebroides Fldr. Body and forewing reddish-brown. The black median line in the middle slightly 
bent, before it some feeble indistinct lines. Behind it a similarly strong one from % of the costal margin 
vertically, from vein 5 incurved, from vein 2 vertically to the inner margin. The enclosed area slightly darker. 
A little behind the middle of the distal area another dark line bifurcating in front, ending yet at the inner 
margin. 35—40 mm. Cape Colony. Besides numerous forms have been denominated which it is difficult to 
separate, as the reticulated marking exhibits variable branches. — - reussi Strd. (79 b). Median area very 
narrow at the inner margin. In the A the base and costal margin of the otherwise brown forewing show a grey 
hue, in the $ the ground-colour is dark red-brown, the median band not darker, its distal edge frayed out. The 
submarginal line in the <$ and $ with many branches obliquely to the distal margin. Hindwing brown. 40 to 
50 mm. East Africa, tristis Dry. is probably identical with this form, but its figure is not good enough, 
windhoekensis Strd. (79 b). Ground-colour more greyish-brown. The distal border of the median band beginning 
from the costal margin more oblique. Submarginal line very distinct, only forked at the costal margin. Hindwing 
grey, outside striated dark. $ 38 mm. South-West Africa. — henleyi Wrr. & Rothsch. has already been dealt 
with in Vol. II, p. 425 and figured on pi. 55 1; it differs from reussi $ only in another more distinct line on the 
fore wing proceeding in a curve from the median band near vein 4 and terminating at the anal angle. <$ 36 mm. 
Sudan. — fanti Hmps. differs from windhoekensis in two feeble submarginal lines. Before them feeble black 
and brown striae. Hindwing brownish-grey. 32 mm. Gold Coast. — abyssinica Hmps. Feebly marked. A 
strong, curved interior line instead of the many fine irregular ones in the other forms. The distal border of 
the median area is formed by 2 black streaks at the cross-vein and from the cell-angle a line to the inner 
margin. Behind it 2 lines united at the inner margin. Submarginal line similar as in reussi. Hindwing somewhat 
reddish-brown. <$ 30 mm. Abyssinia. 
C. semicurvatus n. sp. (79 b). Ground-colour yellowish-brown. On the forewing numerous blackish- 
brown lines, especially a somewhat curved one from the middle of the costal margin vertically to the latter 
and a stronger one from % of the costal margin to the inner angle. Before and behind it a narrow stripe lighter 
than the ground-colour. Before the margin 2 lines, parallel to the preceding one. Hindwing very finely marked 
with dark reticulated lines. In the forewing vein 9 is separated from 7 + 8. $ 40 mm. East Africa. Type in 
the Berlin Museum. 
C. kwouus Karsch. (79 b). Forewing dark brown. Above the inner margin the L as in L-nigrum B.-Bak. 
from Egypt (Vol. II, p. 450), but the 2 lines above it forming a V are absent here in kwouus. Instead of it an 
almost white spot within the cross-vein, and inside it a few black lines. From % of the costal margin a straight 
black line to vein 3, where it is slightly angular, and to the inner angle. At the apex an X-shaped marking, 
behind it whitish. At the margin oblique streaks. Hindwing yellowish-brown. Antennae of $ very finely 
pectinate, o 48 mm. East Africa. 
C. brunneofasciatus n. sp. (79 b). Thorax and forewing brownish-white. Subbasal line formed of 
black spots. The median and distal lines are strong. The first divided and with a brown spot at vein 1 a, 
the second somewhat undulate. The space between them darker brown. Before the margin an interrupted line 
rudis. 
cirrilator. 
terebroides. 
reussi. 
windhoek¬ 
ensis. 
henleyi. 
fanti. 
abyssinica. 
semicurva¬ 
tus. 
kwouus. 
brunneo¬ 
fasciatus. 
