PIERIN^. 
49 
Closely allied to Pigea, Boisd., but smaller. 
^ Glossy greenish-wliite. Fore-iving : a very narrow basal black > 
niark ; costa witli a very fine linear black edging tlirougliout ; this 
edging faintly continued from apex along hind-margin to about 
extremity of second median nervule ; about apex some very limited 
blackish scaling immediately precedes black edging ; spots at extre- 
mities of nervules either wanting altogether or exceedingly minute. 
Hind-ioiiig : usually an exceedingly minute spot at extremity of each 
nervule and of submedian nervure. Under side. — Hmd-iuing and 
apex of fore-iuing glistening greyish-creamy ivith a slight pvnJcish 
tinge. Fore-iuing : tint of apical area extending and gradually narrow- 
ing along costa and along hind-margin to between second and first 
median nervules ; no hind-marginal nervular spots. Hind-wing : a 
narrow orange edging on costa as in Pigea ; sometimes the traces of 
an indistinct discal series of grey spots ; no hind-marginal nervular 
spots. 
$ Dull-ivhite, tinged with paU-yelloimsh on margins {more promi- 
nently in hind-wing, luhich is rarely all tinged with yelloiu). Fore-iving : 
costa with a pale-brownish border above costal nervure ; apical blackish 
usually wider than in ^ and more continuous than in Pigea ; hind- 
marginal blackish also better developed ; nervular spots very small 
(that at extremity of submedian nervure minute), but almost always 
distinct ; a fuscous spot (sometimes ill-defined or occasionally almost 
obsolete) between third and second median nervules. Hind-iuing : 
hind-marginal spots very small or minute, but almost always present. 
Under side, — Hind-wing and apex of fore-wing varying from almost the 
sa77ie tint as in $ to pale, deep^ or very deep ochre-yellow ; hind-marginal 
spots wanting altogether in fore-wing, very minute (rarely wanting) in 
hind-wing. Fore-iving : discal fuscous spot always present, rarely 
indistinct. Hind-iving : discal row of spots situated as in Pigea, but 
seldom well-defined, sometimes partly (and in one specimen almost 
wholly) obsolete. 
In addition to its smaller size and (in the ^ s and paler $ s) re- 
markably glistening, satin-like under side, Alha presents in both sexes 
a more acute apical outline in the fore- wings, and in the $ a much less 
development of yellow on the upper side of the hind- wings. I think 
it clear, from the description given by Wallengren making no mention 
of the discal spot on the fore-wings on either surface, that only $ 
examples reached that author. The $ s of the ochre -yellow coloration 
beneath are more frequently met with than those of the paler tint 
resembling the $ s. 
I did not find F. Alha dming my summer sojourn in I^atal ; but the late 
Mr. M'Ken sent down from D'lJrban many specimens of both sexes in the ■ 
years 1869 ^^d 1870, and Colonel Bowker has forwarded several from the same 
locality, including the paired sexes captured on 2 2d August 1878. The only 
month of capture noted on Colonel Booker's exam^jles is August, and I am 
VOL. III. D 
