194 PIEBID.E. 



tinged with yellow. Fore wing : apical half black, with an enclosed, 

 irregular, broad, oblique patch of the ground-colour that extends 

 into the upper apex of the cell, on the inner side of this the black 

 is reduced to a short oblique bar broadened at the lower apex of 

 the cell, from whence it is continued as a somewhat slender diffuse 

 oblique streak to the tornus, where it broadens again abruptly and 

 meets the black on the termen ; the outer margin of the oblique 

 white patch is irregularly crenulate, sometimes trisinuate ; the black 

 colour on the apex often forms a right angle on vein 4 ; on the 

 white patch posteriorly there is a black spot in interspace 2 and 

 another in interspace 3. Hind wing: uniform, a few subobso- 

 lete slender, fuscous, transverse strigse posteriorly ; the terminal 

 margin sometimes with (more often without) a narrow dusky 

 black edging, broadened anteriorly at the apices of the veins. 

 Underside : similar to that in the c? , with similar markings, the 

 ground-colour a dark dull ochraceous, the fusco-ferruginous strigae 

 more numerous. Antennae, head, thorax and abdomen as in the c? . 

 Wet-season brood. J $ . Upperside : differs in the broader, more 

 pronounced, black terminal edging to the hind wing, which is often 

 remarkably broad, and in the $ by the ground-colour which is 

 pale yellow. Underside : the fusco-ferruginous strigae and spots 

 often subobsolete, occasionally entirely absent in the rf . 



Exp. <5 $ 43-62 mm. (T70-2-45"). 



Sab. K early throughout our limits, but not in the desert parts ; 

 extends to China and the Malayan Subregion. 



This insect was described originally from a dry-season J , 

 probably from China. It is most variable in size, and in seasonal 

 dimorphisms of colour. It is also subject more or less to 

 local variation, according to the humidity or dryness of the 

 climate in particular localities. Moreover, the characters peculiar 

 to the dry- or wet-season form are most unstable. It is not 

 uncommon to find specimens with the wet-season character of a 

 broad, black border to the hind wing on the upperside, and on the 

 underside with the prominent fusco-ferruginous transverse strigre 

 and spots, associated with the dry-season form. Again in the J , 

 the width of the orange patch on the fore wing is very variable. 

 Broadly speaking however, and taking the males only, /. pyrene 

 can be divided into two groups. 



(1) Pyrene group. Fore wing : with the orange patch on the 

 upperside broad, extended right across the apex of the cell, but in 

 typical pyrene interrupted there by a black discocellular spot. To 

 this group belong evippe, Drury, rliexia, Fabr., sesia, Fabr., and 

 latifasciata, Butler. 



(2) Pirenassa group. Fore wing : with the orange patch on 

 the upperside narrower, extending only into the upper apex of 

 the cell. To this group belong Jcausala, Moore, satadra, Moore, 

 moulmeinensis, Moore, frequens, Butler, dharmsalce, Butler, luatti, 

 Butler, cingalensis, Moore, jhoda, Swinhoe, and alana, Swinhoe. 

 In the key to the forms I have diagnosed the differences in three 

 of the principal varieties. 



