180 PIEBID.E. 



this bar becomes obsolete. Hind wing : uniform dead white, some- 

 times the apices of one or two of the anterior veins with a little 

 black scaling. Underside : the veins, except those that limit the 

 cell of the fore wing, not bordered with black ; the suffusion of 

 yellow along costal margin, on apex of fore wing, and over the 

 whole surface of the hind wing pale yellow, with a tendency in 

 the extreme dry-season specimens to get almost white ; on the 

 fore wing the black transverse subterminal bars between veins 1 

 and 2 and 3 and 4 are sometimes indicated by mere diffuse small 

 patches of scales ; at other times they are absent. Antenna, 

 head, thorax and abdomen in both seasonal broods much as in the 

 typical form, but paler. 



Evp. <$ $ 44-56 mm. (1-73-2-23"). 



Hab. The N.W. Himalayas up to 4000 ft. ; Nepal ; Sikhim ; 

 Bhutan ; Bengal ; Centi'al, Western and Southern India ; Ceylon. 



Larva. " Cylindrical, tapering at the anal end ; finely white- 

 dotted, with a lower lateral white line. Feeds on Capparis" 

 (Thwaites.) 



Pupa. " Greenish ; thorax and basal abdominal segment acutely 

 angled." (de Niceville MS.) 



Var. daplia*, Moore, differs very little from the typical form, 

 and the differences seem constant only in the wet-season brood. 

 Specimens of the dry-season brood approximate much more closely 

 to the typical form. 



Wet-season brood. J Upperside : almost as in nerissa $ , but 

 in many specimens the greyish-white preapical streaks on fore 

 wing iu continuation of the ground-colour of the wing are entirely 

 absent, the apex wholly black ; the subterrainal black bar between 

 veins 1 and 2 most often obsolete. Hind wing: as in nerissa. 

 Underside : as in nerissa, but the suffusion of yellow confined to 

 the basal half of the costal margin of the fore wing rarely extended 

 to the apex, while on the hind wing it spreads only over the basal 

 half of the wing. On the fore wing the subterminal black bar 

 between veins 1 and 2 is absent or sometimes barely indicated 

 by a little diffuse black scaling. Hind wing : a series of inter- 

 nervular outer slender black streaks confined generally to the 

 posterior portion of the wing. Antennae, head, thorax and 

 abdomen as in the typical form. $ differs from the $ of nerissa 

 on the upperside in the black margins to the veins on both fore 

 and hind wings, which are much narrower and leave a very much 

 greater extent of the white ground-colour apparent. On the 



* The Pieris copia of Wallace has been generally considered to represent the 

 wet-season form, Appias dapha the dry-season form. The types of both are 

 now in the British Museum. The former is labelled "Bengal," and is identical 

 with specimens of true nerissa, from Sikhim; tbe latter "Moulmein," and, 

 judging from its size and the colour of the underside of the hind wing, I think 

 it is undoubtedly the tf (dry-season brood) of tbe variety of nerissa peculiar to 

 Burma. 



