456 L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. [No. 3, 



has the basal area of the forewing on the underside unmarked, while 

 all the species of Nacaduba enumerated below have an additional basal 

 striga, while all those above named lack this striga ; but as the females 

 of all of them are known, the present species cannot appertain to any of 

 them. I refrain from describing it until I hare obtained the opposite sex. 



348. Nacaduba atrata, Horsfield. 



Grose Smith. This species = N. prominent, Moore. 



349. Nacaduba hebmus, Felder. 



This species = N. viola, Moore, = P. unicolar, Rober, Iris, vol. i, 

 p. 66, pi. v, fig. 4, male (1888), described from East Celebes, Coram, 

 and the Key Islands, of which Herr Rober has sent me a male from Ceram. 



350. Nacaduba anctra, Felder. 



Habitat: Amboina (Felder); East Pegu (Elwes); East and South 

 Celebes, the Am Isles, Ceram (Sober) ; Palawan ; Batjan ; Celebes ; 

 Cooktown, N.-E. Australia (Staudinger) ; Philippine Isles (Semper); S.-E. 

 Borneo, Java, Engano, ? Nicobar Isles (Doherty) ; N.-E. Sumatra; Celebes; 

 Yamna, near Humboldt's Bay, North New Guinea (coll. de Niceville). 



Expanse : $ , 1*2 inches. 



Description: Female. Upperside, /orez^n^r plumbeous ; with a largo 

 metallic iridescent silvery-blue discal area, which reaches into the 

 posterior half of the discoidal cell, and occupies the base and inner 

 margin of the wing. Hindioing plumbeous, but the basal two-thirds 

 overlaid with blue scales ; the veins defined with black ; the outer margin 

 has a broad black border with its inner edge lunulated between the veins, 

 bearing a series of marginal black spots between the veins, each spot 

 outwardly defined by a fine anteciliary thread, inwardly by a white 

 lunule, except the two larger anal spots which are inwardly crowned 

 with ferruginous ; a very fine black anteciliary thread. Underside, both 

 wings as in the male. Cilia white. Tail black, tipped with white. 



Described from a single example from Sumatra. It has all the 

 appearance of a female of the genus Catochrysops, to which genus this 

 species bears a strong superficial resemblance. It has several 

 synonyms, Nacaduba aberrans, Elwes, Proc. Zool. Soc. Lond., 1892, 

 p. 626, pi. xliv, fig. 6, male ; Flebeius subfestivus, Rober, Iris, vol. i, 

 p. 64, pi. iv, fig. 33, male (1888) ; Nacaduba pseutis, Doherty, Journ. 

 A. S. B., vol. lx, pt, 2, p. 182 (1891) ; and Dr. 0. Staudinger and 

 Herr Georg Semper both suggest that the Cupido almora of Druce, Proc. 

 Zool. Soc. Lond., 1873, p. 349, n. 14, pi. xxxii, fig. 7, male, from 

 Borneo, is also a synonym, which is probably correct, but I cannot 



