FASCICULI MALAY FUSES 
57 
the butterfly as in the moth). If this is a case of true mimicry, or even of 
adaptive resemblance, and not one of coincidence, it can only be efficacious 
when the insects are on the wing, as the attitude of rest of the moth is 
different from that of any butterfly, its forewings being folded over its hind 
wings and held tightly pressed against the surface on which it is resting. 
Papilio erehus is a rare insect, which we did not collect, or, so far as I am 
aware, even see.’ 
Pompelon, Walker, ii, p. 413 (1854). 
22 . Pompelon rotundata 
Pompelon rotundata, Swinhoe, Cat. Het. Mus. Oxon. i, p. 72 (1892). 
I 9 - Buldt Bcsar (?). 
‘ Flying in clearing ; early morning.’ 
23. Pompelon valentula 
Pompelon valentula, Swinhoe, P.Z.S. 1889, p. 401. 
i^. Biserat, Jalor. 21st October, 1901. 
‘Sitting on tree-trunk, mid-day. The resemblance between the two 
preceding species and butterflies of the genus Euploea is very striking, both 
as regards the form of their wings and their dark, blue-shot coloration, 
which fades into pale brown in places ; but the resemblance is probably 
generic rather than specific, and does not appear to be accompanied by any 
similarity of habits or resting attitude.’ 
Amesia, Westw., Arcana Ent., p. 20 (1841) ; Nat. Library Ent. vii, p. 93 
(1841). 
24. Amesia namouna 
Gynautocera namouna. Double., Ann. Nat. Hist, xix, p. 74 (1847). 
Amesia namouna, Swinhoe, Cat. Het. Mus. Oxon. i, p. 78 (1892). 
I $ . Bukit Besar, Nawngchik. 2,500 feet. 3rd September, 1901. 
‘I took this specimen resting under a gingerwort leaf in the jungle. It 
made no attempt to escape, but when I touched it, a frothy, pale-yellow liquid 
gushed forth in great abundance, with a distinct hissing sound, from a 
minute pore on each side of the thorax, so that the moth, whose wings were 
partially expanded, was surrounded in a few seconds with this substance, which 
had a faint pungent odour. The bulk of the froth very soon exceeded that 
