BERTA. By L. B. Prout. 
127 
form with a corresponding white patch on the forewing. The species is fairly common in the Khasis and known 
from Ceylon and Burma. 
B. angustimedia Prout. Structure nearly as in acte (12 i), 3rd joint of $ palpus longer. Shape of acte, white angusti- 
markings much more extended, the fine, interrupted white line between basal and median area replaced by 
a partly double band of white lunules, median area narrowed, postmedian white line twice inbent and posteriorly 
thickened, distal area largely white. Khasis. 
B. subrectistriga Prout begins to develop the hindwing shape of typical Berta, though the projection subrecti- 
at the 1st radial is short and blunt. Forewing shaped nearly as in acte (12 i) or slightly narrower (termen slightly 
more oblique), the white cell-mark somewhat 8-shaped but less so than in most chrysolineata (the green filling 
being confluent); a characteristic white outer band, broader and less macular than in acte and chrysolineata 
and almost straight, its proximal edge deeply indented by the olive ground-colour. Hinclwing with much 
white marking, including a moderate postmedian band. Mindoro, the unique type somewhat damaged. 
B. chrysolineata Walk. The white markings copious, mostly maculiform. Very easy to distinguish 
except from zygophyxia (which see). Numerous races, however, or perhaps in some cases closely allied species, 
seem to be differentiable, and probably others will be added, as forms which have hitherto been regarded as 
typical extend from Ceylon and India to Java, Borneo and through the Moluccas to New Guinea, the Bismarck 
and Solomon Islands. Walker’s originals, from Ceylon and Canara, were discoloured and he regarded the 
olive ground-colour as a net-work of gold-coloured lines! — philippina Prout (14 g), founded on 3 from 
Palawan, is smaller and presents a very different appearance, all the white markings being greatly reduced, 
though the postmedian series of the hindwing is confluent, forming a zigzag line. — hainanensis subsp. nov. is 
as small as philippina (21 mm) otherwise much nearer to the name-typical race, though the largest white mark¬ 
ings (or at least the spots just outside the cell of the hindwing) show some tendency towards reduction. Porten. 
Hainan, 2 in the Tring Museum. — leucospilota Turn. Similar to ch. chrysolineata but the forewing has a 
continuous white band, at least 1 mm in width (its edges jagged, especially the proximal), formed of the groups 
of irregular spots which lie between the postmedian and the subterminal. N. Queensland, N. W. Australia and 
the Islands of Timor and Alor. — eccimena. stibsp. nov. (14g). Similar to rather larger leucospilota, but of a 
somewhat more greyish tone, the white spots at costa of forewing strong, more or less confluent, the row of 
spots which runs from the largest of these to the middle of the hindmargin well developed, pretty regular, 
especially as regards their distal end, so that the narrow olive stripe which separates these from the jagged 
outer band appears to have a more regular proximal edge than in any other form. Manus, Admiralty Islands 
(loc. typ.) and St. Matthias Island. As the excision in the margin of the hindwing is somewhat shallower than 
in the other races, this may possibly be a separate species. The forms from New Hanover and round the half- 
circle to Rook I. revert towards those of New Guinea (which I have not yet been able to separate decisively 
from the western ones), though the tendency to the whitened costa is observable, as also the ample white spots 
of the hindwing. The species is well worthy of more exhaustive study, when sufficiently ample material has 
been brought together. 
chrysoli¬ 
neata. 
'philippina. 
hainanen¬ 
sis. 
leucospi¬ 
lota. 
eccimena. 
B. zygophyxia Prout (14 g). Difficult to distinguish from some forms of chrysolineata, except by The zygophyxia. 
structure. Forewing with 1st subcostal not stalked (in chrysolineata long-stalked), hindtibia of $ less strongly 
dilated, the terminal process more vestigial. The name-typical race, from the Malay Peninsula and apparently 
reaching Bali, has generally less white marking in the median area of the forewing and never seems to develop 
the rudely 8-shaped white mark at the discocellulars but has some enlarged posterior white spots in the distal 
area of both wings and usually rather strong white maculation at the apex of the forewing. — hetnisponsa subsp. hemisponsa. 
nov. Forewing with 1st subcostal nearly always anastomosing shortly with costal, in any case closely approaching 
it at a point (in z. zygophyxia, so far as observed, always free); white markings in median area increased, two 
large oblong spots between the cell and the zigzag outer band as a rule particularly noticeable. Admiralty 
Islands (loc. typ.), New Hanover and New Ireland, taken together with chrysolineata and curiously parallel in 
that the specimens from the first-named locality are appreciably the whiter. 
B. arfakensis Prout (14 g). Wings more elongate, especially the hindwing at 3rd radial, both with pre- arfakensis. 
dominantly white basal area and -conspicuous white outer band. Forewing with 1st subcostal stalked, 2nd 
arising opposite or beyond 5th. Antennal pectinations of not continued to one-half length of shaft. Dutch 
and British New Guinea. 
B. copiosa Prout (14 g). Venation of hemisponsa', very like a small specimen thereof, but with the copiosa. 
white spots still ampler, the hindwing with sharper tail at the 3rd radial. Naga Hills, only the type $ known. 
It is just possible that it is another form of zygophyxia, though so unlike the Malayan. 
B. fenestrata Prout (14 g), from the Solomons, has the $ antenna pectinate to % or nearly, 1st sub- fenestrata. 
costal of forewing stalked well beyond 1st radial, 2nd subcostal before 5th. Smaller and with much more ex¬ 
tended white markings than olivescens. 
