“The pupa of this last species has nothing peculiar in its general appearance, but possesses the ordinary pupal form; it is tolerably rounded, without any great elevations or depressions; a minute pointed projection is situated on the head over each eye-cover, and a similar process projects from the roots of the wings. Its distinguishing characters are five pairs of spines on the back of the abdominal segments. These spines are found also in _Acræa Alalia_, but appear to be absent in other species, _e.g._ in the Indian _A. Violæ_. Last summer, among some batches of _Thalia_ larvæ--each batch being the progeny from one lot of eggs--I found certain individuals which differed from the others in having much shorter spines, and these changed into pupæ in which the five pairs of spines were proportionally shorter than usual, thus being an exception to the rule that changes in one stage of development are without influence on the other stages. I may remark, by the way, that this law, enunciated by Weismann, can only be applied to imagines and pupæ with certain restrictions. The skin of the pupa forms a sheath or cover for the eyes, antennæ, trunk, legs, and wings of the imago, and if these parts undergo any considerable modification in the latter, corresponding changes must appear in the pupa. This is shown, for instance, by many ‘Skippers’ (_Hesperidæ_), in which the extraordinarily long trunk necessitates a sheath of a corresponding length. The colour of the pupa of _Acræa Thalia_ is whitish, the wing-veins with some other markings and the spines are black; metallic spots are absent. “In the pupa of _Heliconius Eucrate_ the laterally compressed region of the wings is raised into a large projection, the antennal sheaths lying on the edges of the wings are serrated and beset with short pointed spines; instead of the minute projections of _Acræa Thalia_, the head bears two large humped processes; the body is raised on each side into a foliaceous border carrying five spines of different lengths, the foremost pair, directed towards the head, being the longest. The pupa is brown, and ornamented with four pairs of brilliant metallic spots, one pair close behind the antennæ, and three pairs, almost coalescent, on the back before the longest pair of spines. A short spine projects from the middle of each of the latter somewhat arched metallic patches. “In the pupa of _Colænis Dido_ (which resembles that of _Colænis Julia_, and to which may be added those of _Dione Vanillæ_ and _Juno_) the spines are absent, the wing region is but moderately arched, and the antennæ marked only by small elevations; instead of the leaf-like border, there are on each side of the back five knotty or humped processes. The metallic spots are similar in number and position to those of _Heliconius Eucrate_; those on the back have a wart-like process in the middle, instead of a spine.