268 
GASTROMEGA. By Dr. C. Aurivillius. 
madinylca . 
margine- 
punctaia. 
pelias. 
arenicoloris. 
punctifera. 
badia. 
cervicolora. 
cowani. 
the subbasal transverse band of the forewing forming an inwardly open bow, whereas in madagascariensis it 
is sharply angled. If this difference is maintainable, the $ figured by Boisdttval belongs to bibindandy. Mada¬ 
gascar. 
B. madinyka ( Camb.) Conte is another species denominated by Cambotte, but only described and 
figured by Conte in 1909. <§ not described. Head and thorax violettish-brown; abdomen chestnut-brown, 
on the sides yellowish [in the figure these parts of the body are almost grey!]. ,,Forewing with a dark chestnut- 
brown ground-colour, at the distal margin coated with violet; the proximal transverse line is short, near the 
costal margin angular, indistinct, yellow; a very small white dot encircled with black at the end of the discal 
cell 11 ; the distal transverse line is in the figure almost straight, of a bright yellow, the veins of the marginal 
portion are yellowish. ,,Hindwing greyish chestnut-brown, at the hind-margin lighter. Under surface monoton¬ 
ously chestnut brown; hindwing with a straight transverse line. Fringes light grey. Expanse of wings: 82 mm.“ 
Madagascar. 
The following species differ from the preceding ones in the submarginal line of the forewing being broken up 
into small jet-black dots often arranged in two irregular lines. The eyes are distinctly hairy. 
B. marginepumetata Guer. (37 e). G- Wings shaped as in B. madagascariensis. Head, thorax, and 
forewing of a bright red-brown or yellowish brown. Forewing above with a black discal dot, indistinct transverse 
lines and black dots before the distal margin. Hindwing above blackish, at the costal margin of a bright brown 
like the forewing, with a straight and distinct boundary of the colours. The $ is larger (50 to 64 mm) and quite 
differently coloured. Body and forewing yellowish brownish-grey; forewing with a black discal dot and dark 
transverse lines; the space between the distal transverse line and the sub marginal dots is generally filled with 
blackish-grey from the hind-margin to vein 5, whereby a dark transverse band is formed. Hindwing above 
blackish-grey, at the base lighter without markings. Wings beneath monotonously yellowish-brown without 
markings; the markings of the upper surface, however, feebly show through. Madagascar. 
B. pelias Mob. $ differs from that of B. marginepunctata only in the transverse lines of the forewing 
being absent and the fringes being reddish. Probably only a form of that species. The $ described by Mabille 
and figured by Conte (the figure does not correspond with Mabille’s description) seems to me to be a form 
of B. madagascariensis Madagascar. 
B. arenicoloris Butt. Similar to the <$ of marginepunctata, but thorax and forewing with a greyish- 
yellowish (sand-coloured) ground-colour; forewing above at the hind-margin as far as the submarginal dots 
with red-brown hair. Hindwing above sooty-brown, at the costal margin lighter yellowish-grey. The §, accord¬ 
ing to Butler’s description, is similar to that of marginepunctata. Expanse of wings: 50 (<J) to 80 ($) mm. 
Madagascar. 
B. punctifera Mab. 3 unknown. $. Eorewing reddish rusty brown with a black discal dot, from 
the apex to the anal angle a row of distinct black dots being posteriorly irregular, arranged in two rows; nearer 
at the base there are in the posterior portion of the centre of the wing two dark transverse lines not pro¬ 
jecting beyond the discal cell. Hindwing blackish-grey. Wings beneath dark rust-coloured with traces of black 
dots before the distal margin of the forewing. Body similarly coloured, of a strong structure. Antennal pinnae 
very short. Expanse of wings: 72 mm. 
16. Genus: Cwastromega Saalm. 
Although Gastromega and Libethra are placed by Kirby to the Lasiocampidae and Borocera to the 
Pinaridae, these genera are very closely allied and scarcely distinctly discernible. Structurally, Gastromega 
cori'esponds entirely with Borocera. Eyes bare or almost bare. Antennae as in Borocera. Body stouter and 
stronger than in Borocera. The apex of the 3 hindwing is rounded and its distal margin is hardly quite straight. 
Both wings beneath with a dark median band. Borocera castanea seems to me to form a distinct transition 
between the two genera. Stages unknown. 
G. badia Saalm. G (37 f). Colour, marking, and shape of wings are exactly reproduced by the figure. 
The $ (37 f) is much larger, with a whitish streak at the end of the discal cell, thicker brown transverse 
lines, and a more distinct submarginal line composed of small crescents. Madagascar: Nossi-Be. 
G. cervicolora Saalm. unknown. The $ (37 f) is lighter than that of badia, fawn-coloured with 
a dark central dot of the forewing and without a submarginal line or but faint traces of it. Madagascar: Nossi-Be. 
G. cowani Butl. is evidently similar to cervicolora and is described as follows: Light fox-coloured; 
forewing in the first quarter with a feebly curved red-brown transverse line and at the last third with a similarly 
coloured transverse line parallel with the distal margin; between these transverse lines at the end of the discal 
cell a small black spot; marginal third with a silky gloss, somewhat lighter than the rest of the wing, and in 
