a. _Nox_-group. Abdominal fold in ♂ very large; anal valves small, but swollen; antennæ moderate; wings entire, or tailed: includes the Indian _Philoxenus_-group. b. _Coon_-group. Abdominal fold in ♂ small; anal valves small, but swollen; antennæ moderate; wings tailed. c. _Polydorus_-group. Abdominal fold in ♂ small, or none; anal valves small or obsolete, hairy; wings tailed or entire. B. Larvæ with third segment swollen, transversely or obliquely banded; pupa much bent. Imago with abdominal margin in ♂ plaited, but not reflexed; body weak; antennæ long; wings much dilated, often tailed. d. _Ulysses_-group. e. _Peranthus_-group. _Protenor_-group (Indian) is somewhat intermediate between these, and is nearest to the _Nox_-group. f. _Memnon_-group. g. _Helenus_-group. h. _Erectheus_-group. i. _Pammon_-group. k. _Demolion_-group. C. Larvæ subcylindrical, variously coloured. Imago with abdominal margin in ♂ plaited, but not reflexed; body weak; antennæ short, with a thick curved club; wings entire. l. _Erithonius_-group. Sexes alike, larva and pupa something like those of _P. Demolion_. m. _Paradoxa_-group. Sexes different. n. _Dissimilis_-group. Sexes alike; larva bright-coloured; pupa straight, cylindric. D. Larvæ elongate, attenuate behind, and often bifid, with lateral and oblique pale stripes, green. Imago with the abdominal margin in ♂ reflexed, woolly or hairy within; anal valves small, hairy; antennæ short, stout; body stout. o. _Macareus_-group. Hind wings entire. p. _Antiphates_-group. Hind wings much tailed (swallow-tails). q. _Eurypylus_-group. Hind wings elongate or tailed. Genus LEPTOCIRCUS. making, in all, twenty distinct groups of Malayan Papilionidæ. The first section of the genus _Papilio_ (A) comprises insects which, though differing considerably in structure, have much general resemblance. They all have a weak, low flight, frequent the most luxuriant forest districts, seem to love the shade, and are the objects of mimicry by other Papilios. Section B consists of weak-bodied, large-winged insects, with an irregular wavering flight, and which, when resting on foliage, often expand the wings, which the species of the other sections rarely or never do. They are the most conspicuous and striking of eastern Butterflies. Section C consists of much weaker and slower-flying insects, often resembling in their flight, as well as in their colours, species of Danaidæ.