78 Dr. A. G. Butler on the Old- World 



54. Terias indecisa, sp. n. 



$ . Gamboge-yellow ; the primaries having the base 

 blackish, the costal margin very narrowly grey, the apex and 

 a narrow external border dark brown,, insinuated internally as 

 in T. gradiens, with a slight widening at external angle, but 

 without a trace of the internal border characteristic of the 

 T. rahel group ; secondaries with a dentate sinuate external 

 border, a little broader than in T. tilaha and more diffused 

 towards the anal angle : wings below slightly paler than 

 above, with the characteristic markings of the T. hecabe 

 group (wet-season) represented by brown scales and not 

 strongly defined. 



Expanse of wings 45 millim. 



Batchian (Wallace). 



This seems to be a link between the T. hecabe and T. rahel 

 groups ; its upper-surface pattern is characteristic of an inter- 

 mediate or dry-season form, but that of the under surface 

 proves it to be a wet-season form. This insect is so very 

 distinct from any other described form that, although slightly 

 discoloured with age, I am constrained to regard it as new to 

 science. 



T. rahel group. 



The inner border of the primaries and sometimes the abdo- 

 minal border of the secondaries more or less broadly bordered 

 with deep brown ; in some species these and the ordinary 

 borders are so much extended as to occupy the greater portion 

 of the upper surface, leaving only a patch of yellow on each 

 wing, whilst in the females even these patches are sometimes 

 irrorated with brown. 



55. Terias sinensis. 



Terias sinensis, Lucas, Kev. et Mag. de Zool. 1852, p. 429. 



" China " (Lucas) ; Sulu Archipelago. $ , B. M. 



Our single example agrees well with the description. It 

 approaches very near to the type of T. gradiens from Borneo, 

 but differs in its slightly longer wings and narrower borders. 

 It is a wet-season form. 



56. Terias gradiens. 



Terias gradiens, Butler, Ann. & Mag. Nat. Hist. ser. 5, vol. xvii. p. 223, 

 pi. v. fig. 9 (1886). 



Borneo, Sandakan. 



Our male from Sandakan has the inner border of the 



