PIERINiE. 49 



Closely allied to Pigca, Boisd., but smaller. 



^ Glossy greenish-wliite. Forc-iciiicj : a very narrow basal black 

 mark ; costa with a very fine linear black edging throughout ; 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-wing : usually an exceedingly minute spot at extremity of each 

 nervule and of submedian nervure. Under side. — Hind-iuing and 

 apex of fore-wing glistening greyish-creamy with a slight innhish 

 tinge. Fore-wing : 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 pale-yelloiuish on margins {more promi- 

 nently in hind-icing, which is rarely all tinged witli yellow). Fore-wing : 

 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-vnng : 

 hind-marginal spots very small or minute, but almost always present. 

 Under side. — Hind-wing and apex of fore-wing varying from almost the 

 same 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-wing : discal fuscous spot always present, rarely 

 indistinct. Hind-wing : discal row of spots situated as in Pigca, 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 dill not find P. A/ha. diu'ing my summer sojourn in Xatal ; but the late 

 Mr. j\I'Kon sent down from D'lJrban many specimens of both sexes in the 

 years 1869 and 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 Bowkcr's examples is August, and I am 

 VOL. III. D 



