820 
GERYDUS. By H. Fruhstorfer. 
found the form. The differs from the rj only by angular instead of roundish hindwings. Forewings with 
a white basal area which is defined by a jet-black apical border. In the $ the black apical border recedes 
somewhat, so that the white median area increases in extent . Hindwings grey. The under surface light grey 
with an extensive white median zone of the forewing, grey-brown bands and a reddish brown distal tint. The 
zinckeni. cell-apex of the forewing, like in G. biggsi, covered by a short blackish spot, zinckeni Fldr. (141 e). I only found 
it in West Java on the slopes of the Volcano Gede up to about 1000 m. Under surface distinguished by a 
valcns. bright red-brown lustre on the distal parts of the wings. •—• valens Fruhst. is of a smaller habitus, the 
black apical border proximally more sharply defined. Under surface without the red-brown parts distinguishing 
zinckeni, the longitudinal bands being grey instead of brown. West Sumatra, very rare. Dr. Martin in 13 years 
pallaxopas. only found one $ which is now in my collection. —- pallaxopas Fruhst. from Selangore, Malayan Peninsula. 
The base of the forewing only slightly powdered with grey, thus not so densely scaled with brown as in zinckeni 
from West Java . The under surface considerably duller grey than in improbus. Type: a in the British Museum. 
improbus. — improbus Druce, described as a species, is the Kina Balu race of the rare collective species, growing 
larger than the mentioned Macromalayan sister-races; the white area of the forewing also appears more extensive, 
so that the black terminal margin is narrowed. Under surface approximating again more zinckeni by a brown- 
red, though somewhat faded tinge of the marginal parts of both wings. 
G. gaetulus. An interesting species which we may yet expect from the Malayan Peninsula and quite 
a number of satellite islands of Sumatra. The species was in the Coll. Adams of the British Museum in a 
magnificent, undenominated form from Nias. Both sexes scarcely differ beneath from G. zinckeni, but above 
immediately discernible by white hindwings being only narrowly margined by brown, instead of blackish-grey 
gaetulus. ones. The forewings of the ££ are decidedly more pointed than those of the zinckeni-G3- —■ gaetulus Nicev., 
hitherto known only in the female of which Dr. Martin was able to capture only 3 specimens in all his long 
innocens. collective period, one of which is now in my collection. — innocens Druce, established as a species, mainly 
differs from gaetulus by a more extensive white discal orb of the forewing. Very rare on the Kina Balu and, 
aphytis. like the zinckeni- race of the same mountains, of a larger habitus than the Sumatran vicarious type. — aphytis 
Fruhst. from Nias. <$: upper surface whitish, only a narrow costal margin of the hindwing and a broad apical 
margin of the forewing black. $ more similar to innocens than the <$, but with a still narrower black margin 
of the hindwing. Under surface lighter than that of innocens -$. Hindwing without the brown anal margin 
and without the delicate, middle, yellowish terminal tinge. The median band, however, darker grey. Type 
in the Coll. Adams of the British Museum. 
gall us. G. gallus Nicev. (141 e), peculiar of the Island of Sumatra, but it is probable that off-branches of 
it will be yet discovered on the Malayan Peninsula or on the Kina Balu. Upper surface brown-black with an 
interrupted white band of the forewing reaching in the submedian zone almost the distal margin. Under surface 
preponderantly yellowish with a whitish-yellow apical point of the forewing. Hindwing with a reddish tinge 
in the posterior half. Forewing with a black transcellular region and the black basal spot being usually found 
in the genus. 
G. ancon is the most magnificent of the Gerydinae being distributed in three branches from Indo- 
China to Borneo. We, however, do not yet know any representative from the Malayan Peninsula, whereas 
ancon, ancon is replaced in Sumatra by a magnificent highly specialized form, ancon Doh. Both sexes with a black 
basal spot on the forewing, tapering distallv into a cone and dividing the white discal region into two unequal 
parts. Apical margin very broad, jet-black. Hindwings grey with a slaty lustre. Under surface similar to 
that of Gerydus symethus, forewing with a shorter black basal area, an undivided white median zone and a 
black transcellular spot. The apical and terminal margins, as well as the hindwings arc reddish brown with 
gigas. yellowish and whitish faded brightenings. From Tenasserim and Burma, rare. — gigas Druce (141 e) is, parti¬ 
cularly in the female, only slightly different, but a gigantic alpine form from the Kina Balu in North Borneo. 
The white discal area of the forewing without the black in the <J, which, however, appears again in the 
Under surface of the hindwings of the $ somewhat lighter than in the ancon -$, otherwise not different. -—- 
anconidcs. anconides Fruhst. Sarawak (Borneo). According to Moulton’s valuable Index of the Lycaenidae of Borneo, 
anconides differs from ancon by the coherent white band of the forewing. The anteterminal line of the under 
surface of the hindwing is broken up into single small dashes, as in the $ of the continental subspecies. 
gigantes. G. gigantes Nicev. (141 e) replaces ancon in North East Sumatra and Penang. When the butterfly 
is flying, it resembles a Pierid. The forewings are, except the distal margin, chalky white, so are the hindwings. 
The under surface very much like that of G. ancon, though the median white region decreases considerably, 
because it is displaced by a more extensive black spotting. Hindwings preponderantly grey with intensely 
brown-grey bands. In contrast with the ancon- races, the cell of the forewing is also covered with grey-brown, 
and at the cell-apex there is a blackish spot. 
heracleion. G. heracleion Doh. is described by its author as follows: , )C J: forewings less sharp than in G. symethus. 
Hindwings rounded off. Above brown, forewings with a slate-coloured lustre, the apex darker. A broad, white 
