XV11 INTRODUCTION. 
others, C. chrysotheme and C. philodice, continue down the central plateau to Mexico 
or Guatemala. Callidryas and its allies are perhaps the most conspicuous of the 
Central-American Pierine, and they congregate in large numbers, with various species 
of Terias, Papilio, &c., on the banks of rivers and ponds, or in wet places in the roads, 
especially in the dry season, when compact masses of them on a space a foot or so 
in diameter are often seen. Archonias dismorphites, A. lyceas, A. nigrescens, and the 
females of certain species of Pieris (P. malenka, &c.), as well as Enantia deione (of 
the group Dismorphiina), resemble in their style of coloration various Ithomiina and 
Heliconiine inhabiting the same places. The females of the Pier’s mentioned also 
have narrower wings than the males, the mimicry thus being still more accentuated. 
Archonias approximata, again, has the coloration of Papilio mylotes, and inhabits 
much the same localities. 
The Dismorphiina, a purely Neotropical group, are represented by four genera, most 
of the species frequenting forest-districts. In their elongated wings (which in some 
forms are diaphanous) and in their weak flight they exactly resemble certain species 
of the Danaine group Ithomiina, nearly each genus of which is, as it were, duplicated 
amongst the Dismorphiina, as noticed by Bates on the Amazons and mentioned by 
him in his paper on “‘ Mimetic Resemblance.” They are characteristic of the Tropical- 
American fauna, though more frequent on the mountain-slopes than in the low 
ground; our genera are all South-American, Dismorphia reaching North Mexico and 
Enantia extending a little north of the Mexican boundary, where possibly it is not 
really indigenous. 
The Papilionine include two genera only—Vapilio, in the wide sense, which is 
universally distributed, and Laronia, the latter represented by a single species peculiar 
to the Sierra Madre del Sur, Western Mexico. The gigantic Ornithoptere of the 
eastern tropics are altogether absent in America; but this deficiency is richly com- 
pensated for by the abundance and variety of Papilio, upwards of eighty species 
occurring within our limits. These we have divided into thirteen groups, the typical 
representatives of which are zestos, montezuma, mylotes, polydamas, thymbreus, prote- 
stlaus, thoas, epidaurus, pandion, zagreus, eurotas, asclepius, and daunus respectively. 
It is worth while to again call attention to the dimorphism amongst the females 
of some of the South-American species of the P. epidaurus-group, a peculiarity not 
shared by the Central-American forms, and to note the resemblance of P. zalates (of 
the P. zagreus-group) to some of the Danaine forms, e. g. Lycorea. The genitalia 
of the males of many of them are figured on our Plates. The true affinities of 
