PIERIN^. 
39 
but restricted the name of Pieris to a very limited group of Tropical 
American species (fifteen), forming Section I. of Boisduval's subdivision 
of the old genus, and for which Hiibner's name PerrJiyhris has been 
generally adopted. I cannot find that his genera Appias ( = Tachyris, 
Wallace), Belcnois, Pontia, and Synchloe are satisfactorily separable ; 
these I regard as constituting the bulk of the genus Pieris, and they 
contain, according to Mr. Butler, 179 described species. Of those 
genera of Mr. Butler's which include African species, I think that 
Mylothris and Herpcenict are deserving of adoption, considering their 
peculiarities of structure and pattern. 
Pieris, as here regarded, is of almost universal distribution. New 
Zealand being the only extensive land area at any considerable distance 
from the poles which has no known representative of the genus. Taking 
the number of recorded species at about 230, it is noticeable that the 
Oriental and Australian regions greatly preponderate in richness and 
variety of forms, upwards of a hundred, or not far from half the genus, 
being native there, and a considerable number of these apparently 
inhabiting both regions. The Neo-Tropical Region yields between 
fifty and sixty species, and the Ethiopian about thirty-seven. The 
great Palaearctic Begion and the Nearctic are both exceedingly poor, 
possessing respectively fourteen and eleven species only. 
In South Africa fourteen species are known to occur ; they belong 
to four groups, of which P. Saba, (Fab.), P. Pigea, Boisd., P. Calypso, 
Drury, and P. Daplidice, (Linn.), may be regarded as the respective 
representatives, viz. : — 
Group i. — Sala, Fab., representative. 
Sexes extraordinarily different. $ white, with an incomplete narrow 
apical hind-marginal border in fore-wings ; onder side with hind-wings 
and apex of fore- wings creamy. ^ with very broad black hind-mar- 
ginal borders to both fore and hind wings, and with basi-disco-cellular 
area of fore-wings usually also black ; under side white with similar 
but much fainter blackish markings. The $ has an inferior abdominal 
tuft of bristly hairs, — the characteristic of Wallace's genus Tachyris. 
(i species.) 
Group 2. — Pigea, Boisd., representative. 
Sexes moderately dissimilar. J greenish- white (in one species, P. 
Spilleri, Stand., sulphur-yellow), with very small and inconspicuous 
hind-marginal blackish nervular spots (scarcely apparent except at and 
near apex of fore-wings, where they are enlarged) ; under side with 
hind-wings and apex of fore-wings faintly tinged with yellowish or 
greenish, sometimes speckled with fuscous and with traces of discal 
fuscous spots in hind-wings. $ usually more or less tinged with ochre- 
yellow, especially in hind-wings, and with one or more discal fuscous 
spots in fore-wings ; hind-marginal nervular spots larger, especially in 
fore-wings; under side more deeply coloured with ochre-yellow. 
