24 ME. G. T. BETHUNE-BAKEE : A EEVISION OF THE 



This species is described from a unique type, and is certainly somewhat different from 

 ameria Hew. It would be very satisfactory if we were able to get other specimens 

 from the same district. 



Thaduka Moore. 

 Thaduka Moore, Proc. Zool. Soc. Lond. 1878, p. 836 ; de Niceville, Butt. Ind. vol. iii. p. 225 (1890). 



The neuration is almost the same as in Mahathala, but in the primaries the third 

 subcostal nervule is longer ; whilst in the secondaries the costal nervure is bent down- 

 wards, not upwards, the subcostal nervule is not nearly so strongly arched, and the 

 internal nervure is decidedly longer than in that genus. The two discocellular nervules 

 of the secondaries are each inclined outwards, being thus of exactly the reverse position 

 to that in Mahathala, and the lower discocellular nervule is very decidedly longer than 

 the upper. 



The costa of the primaries is more strongly arched than in Mahathala. Palpi 

 slender. Antennas short. Body stout. 



This genus may be known from all others by its species having three tails, two of 

 which are somewhat spatulate. Some species of Iraota have three tails, but they are 

 long and by no means broad. The genitalia approach closely to the pattern of 

 the genus Arhopala, with the fully-developed tegumen and the small clasps. 



Thaduka multicaudata Moore. (Plate IV. figs. 5 & 5 a.) 



Thaduka multicaudata Moore, Proc. Zool. Soc. Lond. 1878, p. 836, pi. Iii. fig. 7, ? ; de Niceville, 

 Butt. Iud. vol. iii. p. 225. n. 785, pi. xxvii. fig. 196, ? (1890). 



Hab. Upper Tenasserim ; Nilgiris (January, August, and September). 



Expanse, <s 38-44, ? 44-48 mm. 



d . Upperside : both wings purplish black, with the basal, discoidal, and submedian 

 areas very pale silvery blue ; abdomen and fold greyish. Underside : both wings dark 

 vinous brown. Primaries with the posterior half and the submedian space hoary ; the 

 central cell-spot is indistinctly outlined by pale bluish, and the spot closing the cell is 

 grey with superimposed bluish scales ; the dark catenulated transverse band is 

 distinct and composed of six spots, the upper three oblique outwardly, the second and 

 third being dislocated, the fourth, fifth, and sixth dropping almost perpendicularly from 

 the third, while all are palely edged; submarginal row of <-shaped shading distinct. 

 Secondaries with the three dark, irregular, ill-defined, maculate, transverse bands palely 

 edged generally ; these markings are sometimes very indistinct indeed ; anal area 

 with a slight suffusion of bronzy-green or bluish scales, which are sometimes scattered 

 sparingly over other parts of the wing. 



2 . Upperside : like the male, but with the blue not quite so pale (not silvery) and 

 bluer. Underside like the male, but not so dark and browner.', the markings decidedly 

 more distinct and the metallic-bronzy scaling more abundant. 



