Annals of the Transvaal Museum 
169 
The type of this genus has been placed by Walker in Rethona, but Sir 
George Hampson kindly informed me that this genus, of which strigosa is the 
type, has to come in the Limacodidae. R . albicans, Wlk. was placed by Prof. 
Aurivillius in the genus Cerura when he identified some of my specimens, but 
the presence of four spurs on the hind tibiae is sufficient to remove this species 
from Cerura. I have therefore been obliged to create another genus for it. 
There are, however, many points of resemblance between this genus and 
Cerura ; the venation on the whole, the process of the fore tibia, the shape of 
the spurs, the pectination of the antennae and the type of marking on the fore 
wing all point to close relationship. 
PSEUDORETHONA ALBICANS. 
(PI. I, fig. 9; PI. Ill, figs. 1-6.) 
Rethona albicans Wlk. Cat. v. p. 1043 (1855). 
The description given by Walker is very short and much too vague, so I 
think it useful to re-describe the species. 
<$. Whole insect pure white; hairs on frons, on palpi and at sides of head 
fuscous (xlvi); thorax, and fore wing at basal, medial area, and postmedial 
area above vein 6, light patch at apex and tornus tinged with pale dull green- 
yellow (xvii) ; lines on head, thorax and wings black ; a few black scales on frons 
and before antennae ; patagia and tegulae edged with black ; a crest beyond each 
tegula and tipped with black; a central crest on metathorax also tipped with 
black; abdomen above hair-brown (xlvi). Fore wing with a broad basal line 
from costa till 1 b, dentate on the veins ; a double sub-basal line from costa to 
inner margin, curved and much angled at the veins, space between them pure 
white; antemedial line double, more erect, very much angled and dentated on 
the veins, and space between them pure white, lines farther apart near costa 
than at inner margin ; space between outer sub-basal line and inner antemedial 
line, densely irrorated with black except a round spot in the cell which is tinged 
with pale dull yellow-green; medial line double, broad near costa, as is the case 
in the outer antemedial line, then narrow ; inner line parallel to outer antemedial 
as far as vein 2, then touching antemedial and forming between them a round 
spot tinged with the light greenish, a black irroration between the lines at inner 
margin ; outer medial line curved outwards below costa touching outer side of 
orbicular, which consists of two black strigae filled in with the pale greenish, 
then almost straight to vein 2, then dentate inwardly on plical fold and 1 b and 
touching antemedial at inner margin; postmedial beginning as a broad oblique 
streak from before apex, which is sharply defined on the outer side, then a little 
narrower and less defined to near medial line at vein 4, then outwardly oblique 
to vein 2, then curved inwards to plical fold, then curved outwards above 1 b, 
then erect to inner margin; a black irroration beyond it reaching the termen 
between veins 7 and 2 except for a triangular patch from vein 7 to 6 which 
remains tinged with the pale green; a black irroration at tornus below plical 
fold; a black fine terminal line, rather thicker between the veins; cilia white, 
tinged with pale green and checkered with black between the veins. 
Hind wing pure white, except some fuscous black scaling at the tornus; 
a fine fuscous-black terminal line interrupted by the white at the veins; cilia 
white. 
Under side: wings, thorax and abdomen and hairs on legs pure white; tarsi 
black, ringed with white; fore wing with costa broadly edged with black and 
with some white irregular marks at basal, antemedial, medial, and postmedial 
areas ; terminal half of wing from costa to vein 2 irrorated with fuscous, only 
