have, towards the middle, a large patch of very brilliant azure-blue, sinuated posteriorly, where it is on a line with a series of spots formed by the union or condensation of the minute golden atoms; the anal angle with an ocellated spot having a red iris surmounted by a very narrow violet arc: tail black: under side brown, sprinkled with grey particles, which are so condensed towards the apex of the upper wings as to form a broad transverse band, interrupted by dark nervures: under wings with a posterior row of seven ocelliform spots, dark in the centre and having a yellowish-red iris, divided anteriorly by a slender violet arc: body black, powdered with particles, in the same manner as the wings. The female differs only in the ground colour being a little darker, and in having a transverse ray of condensed particles, which reaches from the internal border nearly to the middle. The caterpillar is probably very similar to that of _P. Arjuna_, described by Dr. Horsfield.[31] PAP. PROTESILAUS. PLATE IV. Fig. 1. _Linn. Fabr. Cramer_, Pl. 202, fig. A, B; _Merian’s Insec. Surin._ Pl. 43. The two insects delineated on the adjoining plate exemplify a form which prevails among a pretty extensive group of the genus _Papilio_, and which is familiar to European entomologists as represented in a very characteristic manner by the beautiful _P. Podalirius_. The prolongation of the hinder wings into a long narrow tail is the most striking feature, and has caused them to be termed swallow tails. The ground colour is for the most part pale,--light yellow, or green,--and the wings are marked with numerous transverse stripes of dark brown or black. They are not confined to any particular country, but are distributed over most regions of the globe, although the greatest number are found in Brazil and other parts of America. _P. Protesilaus_ is one of the most common inhabiting the country just named. It expands nearly four inches; surface pale white, almost transparent, tinged with green at the base of the superior wings; the latter having seven narrow transverse black bands commencing at the anterior margin, the innermost five very short, the sixth descending to the internal angle, where it unites with the seventh, which runs along the margin: inferior wings black at the hinder extremity, that colour divided by two rows of large lunules of the ground colour, the anal angle with a bright transverse spot of carmine-red; tail very long and narrow, bordered with white, and having before its base two or three greyish-blue spots, composed of minute particles. On the under side the most remarkable differences are, that the two interior bands are prolonged to the anal angle, where they unite, and the outer one is bordered on one of its sides with a stripe of carmine: body whitish, with a broad black stripe along the back, another on the sides, and three along the belly. [Illustration: PLATE 4.