a. Nox-group. Abdominal fold in male very large; anal valves small, but swollen; antennae moderate; wings entire, or tailed; includes the Indian Philoxenus-group. b. Coon-group. Abdominal fold in male small; anal valves small, but swollen; antennae moderate; wings tailed. c. Polydorus-group. Abdominal fold in male small, or none; anal valves small or obsolete, hairy; wings tailed or entire. B. Larvae with third segment swollen, transversely or obliquely banded; pupa much bent. Imago with abdominal margin in male plaited, but not reflexed; body weak; antennae long; wings much dilated, often tailed. d. Ulysses-group. {Protenor-group (Indian) is e. Peranthus-group. {somewhat intermediate between f. Memnon-group. {these, and is nearest {to the Nox-group. g. Helenus-group. h. Erectheus-group. i. Pammon-group. k. Demolion-group. C. Larvae subcylindrical, variously coloured. Imago with abdominal margin in male plaited, but not reflexed; body weak; antennae 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. Larvae elongate, attenuate behind, and often bifid, with lateral and oblique pale stripes, green. Imago with the abdominal margin in male reflexed, woolly or hairy within; anal valves small, hairy; antennae 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 Papilionidae. The first section of the genus Papilio (A) comprises insects which, though differing considerably in structure, having 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 Danaidae.