CHONDROSTEGA; CHONDROSTEGOIDES. By Dr. C. Aurivillitts. 
207 
B. Vein 5 of hindwing from the posterior angle of the discal cell or forked with vein 4. 
a. Vein 8 of hindwing touches vein 7 in one place or rarely for some distance, or it is united with it 
by a very short almost vertical cross-vein. Basal cell smaller and shorter than the discal cell. 
6. Lasiocampinae. 
(3. Vein 8 of hindwing united with vein 7 by a long cross-vein slantingly extending from inside to in 
front and outside. Basal cell as large or almost as large as the discal cell. 
7. Gonometinae. 
1. Subfamily: Chondrosteginae. 
The species belonging to this subfamily differ considerably from the other Lasiocampidae in all the 
stages of development. The imagines are small, with short and broad wings being rounded off at the margin, 
with a long-haired body. Forewing at the costal margin from the base to beyond the middle straight or feebly 
emarginated, then more or less convex; anal angle altogether rounded off. Costal margin of hindwing straight 
or at the base more or less lobate. The wings are above uni-coloured without markings or but indistinctly marked. 
The discal cell is open in both wings. Vein 8 of fore wing rises either separately between the veins 6 + 7 and 
the fork of 9 + 10, or it is absent altogether; vein 8 of hind wing either comes almost out of the base of the 
wing, or it is, for a shorter or longer distance, completely united with the anterior edge of the discal cell. Palpi 
stunted. Antenna of <$ as far as the apex with long pectinations. Abdomen short, not or but little projecting 
beyond the anal angle of the hindwing. 
The stages of the Ethiopian forms are unknown, the larvae of the palearctic species are distinguished 
from those of the other Lasiocampidae by being provided with small hairy tubercles (cf. Vol. II. p. 149). 
Only two genera are hitherto known from the Ethiopian Region. 
1. Genus: Clioiulrostegu Led. 
Anterior tibiae short, at the apex armed with 1 or 2 spines. $ wingless. — In the species known so 
far from Africa vein 8 of the forewing is absent, vein 7 of the forewing rises close at the base of the fork of 
9 and 10, and vein 8 of the hindwing rises from the base of the wing. The frons exhibits a short horny append¬ 
age which is provided with a ring at the apex and projecting in the middle. Eyes bare. As to the palearctic 
species cf. Vol. II., p. 149 and pi. 24 a. 
Ch. ruficotnis Auriv. Head and thorax blackish-grey, abdomen with dark grey hairs. Antennae of a 
bright reddish yellow, with somewhat flattened, apically feebly thickened pectinations. Wings brownish-grey, 
somewhat transparent, with an indistinct lighter postmedian transverse band. Expanse of wings: 28 mm. 
Cape Colony. 
Ch. murina sp. n. Head and dorsum of thorax blackish, underside and abdomen with dark grey hair. 
Antennal shaft light yellowish with dark pectinations. Wings untransparent monotonously blackish-grey, 
without markings and with somewhat lighter fringes. Expanse of wings: 22 mm. Cape Colony. 
2. Genus: Auriv. 
Separated from Chondrostega particularly by the unarmed, not shortened anterior tibiae and by the 
$$ being provided with wings. — Eyes hairy. Frons with a horny protuberance. Middle and hind tibiae without 
spurs. Vein 8 of forewing present and rising from the centre of the fork of 6 and 7. Vein 8 of hindwing from 
the anterior edge of the discal cell about midway between the base and vein 7. 
Ch. capensis Auriv. (35 b). Vertex and frons whitish, thorax with brownish and whitish hair. Wings 
above grey; forewing at the costal margin and anal margin more or less whitish, with a somewhat darker 
postmedian transverse band which forms a dark spot at the costal margin; hindwing at the costal margin and 
hind-margin whitish. Forewing beneath more distinctly marked than above. Hindwing beneath in the centre 
with a large irregularly triangular brown spot which is extended towards the base and despatches distally an 
obtuse branch towards the apex of the wing and a broader one towards the anal angle; a small black discal 
spot, a black spot at the costal margin and a similar one in area 1 c; at the margin numerous blackish 
scales. Expanse of wings: 22 mm. Cape Colony. 
2. Subfamily: Malacosomatinae. 
Vein 8 of hindwing separate at the base, but immediately united with the anterior edge of the discal 
cell in one place or for some distance, forming a small, sometimes minute basal cell, and then extending quite 
separately and distantly remote from vein 7 to the costal margin. Vein 7, however, rises at or near the anterior 
ruficornis. 
murina. 
capensis. 
