257 



646. Terias silhetana. Wallace, Trans. Ent. Soc. (3) iv, 1867, p. 324; 

 Watson, Jour. Bomb. N. H. Soc. viii, 1894, p. 509 j Davidson. 

 Sell 4- Aitken, Jour. Bomb. N. H. Soc. x, 1897, p. 571, pi. (>, 

 tigs. 0, 6 a, larva & pupa ; Sutler, A. M. N. H. (7) i, 1898, 

 p. 71. 



Terias citrina, rotundalis et uniformis, Moore, Lep. Ceyl. i, 1881, 

 p. 1 19, pi. 45, figs. 4, 4 , $ ; p. 120, pi. 46, tigs. 1, 1 a, 1 b, rf $ ; 



Terias vallivolaus, Sutler, A. M. N. H. (5) xi, 1883, p. 420. 

 Terias heliophila, Butler, 1. c. xvi, 1885, p. 338, pi. 8, tig. 2. 

 Terias templetoni, Butler, 1. c. xvii, 1886, p. 218. 



The tvpe is a specimen of the dry-season brood and can be 

 described briefly as follows : 3 . Upperside : rich citron-yellow. 

 Fore wing : markings very similar to those in T. hecabe var. 

 patruelis, Moore (compare figs. 62 c & 65 ). Hind wing : ground- 

 colour uniform ; a very narrow 

 black terminal line. In the 

 type this is continuous, in other 

 specimens broken and inter- 

 rupted and in some large 

 specimens intermediate between 

 the dry and wet-season forms, 

 variable in width but distinctly 



Fig. 65. Terias silhetana. 



a. Typical upperside. 



b. Pore wing underside. 



broader than in the type. 

 Underside : ground-colour very 

 slightly paler; markings much 

 as in dry-season specimens of 

 T. Jiecabe, but in the fore wing there is alivays an additional 

 minute reddish-brown dot at the extreme base of the cell, and in 

 all typical specimens the apical reddish-brown patch is much 

 larger and spreads diffusely outwards to the termen. 



Wet-season brood. tf $ . Upperside : citron-yellow. Fore wiug : 

 markings very similar to those of T. Jiecabe var. meryuiana, Moore, 

 but the black area broader, especially the dilated, posterior, tornal 

 portion which, though squarer, has its inner edge slightly sloped 

 outwards as in merguiana (compare figs. 62 a & 66 a). The width 

 of the black area is, however, very variable, as are also the size and 

 shape of the dilated posterior portion that occupies the tornal 

 angle. Hind wiug : a black band along the terminal margin ; 

 this band very variable in width and generally attenuated anteriorly 

 and posteriorly. Underside : ground-colour similar ; markings very 

 light, similar to those in the wet-season specimens of T. hecabe, 

 but, always with an additional reddish-brown dot at the extreme 

 base of the discoidal cell of the fore wing. Antenna?, head, 

 thorax and abdomen, and in the c? the sex-mark, as in T. hecabe. 

 Exp. <5 $ 41-53 mm. (1-63-2-10"). 



Hub. Sikhim ; Central and Southern India ; Assam : Burma ; 

 Teuasserim ; the Anclamans ; extending into the Malayan Sub- 

 region. 



This is almost as puzzling and variable a form as T. hecabe. 

 Dry-season specimens can be discriminated from the corresponding 



