1895.] L. de Niceville & Dr. L. Martin— Butterflies of Sumatra. 497 
to quite a different group, T. toba being of the hecabe group. Described 
from two males and one female. 
542. Terias andersonii, Moore. 
This also appears to be allied to T. sari , Horsfield, the males are the 
same size, the “male-mark” is the same, not as in the preceding 
species, it agrees with T. sari also in the markings of the discoidal 
cell of the forewing on the underside ; differing, however, in its paler 
colour, though it is not as pale as the preceding species; in having 
on the underside of the forewing either no apical brown patch or a very 
small linear one, and no oblique brown marking at the outer angle as 
T. sari has. The cilia is black as in T. sari. It differs only from the 
types of T. andersonii now before me in its usually rather larger size 
and somewhat paler coloration on both surfaces. One specimen agrees 
in all respects with Distant’s figure of T. senna , Felder, Rhop. Malay., 
pi. xxv, fig. 14, female , in having the markings of the underside entirely 
obliterated. 
543. Terias hecabe, Linnasns. 
Hagen. Snellen. Grose Smith. Wallace. Distant. This species 
has been well figured by Snellen in Midden-Sumatra, Lepidoptera, pi. i, 
figs. 6, 7 male [nee female] type (1892), see his Index to the Plates, p. 85. 
According to Capt. E. Y. Watson (Journ. Bomb. Nat. Hist. Soc., vol. viii, 
p. 509 (1894), T. hecabe may be known by never having “ More than two 
streaks or spots in the discoidal cell on the underside of the forewing in 
addition to the reniform spot on the disco-cellular nervules’.” He has 
identified for me from Sumatra both the rainy-season form (true 
T. hecabe and T. hecabeoides , Menetries), which has “No apical brown patch 
on the underside of the forewing,” and the dry-season form ( T. excavata , 
Moore), which has at the “Apex of the forewing on the underside a 
more or less strongly pronounced brown patch.” Seasonal forms m 
Sumatra, are, I believe, quite unknown, so perhaps, as in the case of 
Melanitis ismene , Cramer, the two forms, dry and wet, which are seasonal 
in India, occur together and without any reference to the dryness or 
humidity of the atmosphere in Sumatra. T. hecabe is numerically by 
far the commonest species of the genus in Sumatra, and Capt. Watson 
has kindly identified six different varieties of it for me, some of which 
he names T. hecabeoides, Menetries, T. excavata , Moore, T. swinhoei , 
Butler, T. patruelis, Moore, and T. merguiana , Moore. It would, I 
think, serve no useful purpose in our at present very superficial and 
inadequate knowledge of the genus as represented in the Malay Archi¬ 
pelago to define precisely all these varietal forms, some of which may 
perhaps be distinct species. It remains for a local observer to breed 
