456 L. de Nic£ville & 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 have obtained the opposite sex. 
348. Nacaduba atrata, Horsfield. 
Grose Smith. This species = N. prominens , Moore. 
349. Nacaduba hermus, Felder. 
This species = N. viola , Moore, = P. unicolar , Rober, Iris, vol. i, 
p. 66, pi. v, fig. 4, male (1888), described from East Celebes, Ceram, 
and the Key Islands, of which Herr Rober has sent me a male from Ceram. 
350. Nacaduba ancyra, Felder. » 
Habitat: Amboina ( Felder); East Pegu ( Elives ); East and South 
Celebes, the Aru Isles, Ceram (Bober); Palawan; Batjan; Celebes; 
Cooktown, N.-E. Australia ( Staudinger ); Philippine Isles {Semper); S.-E. 
Borneo, Java, Engano, P Nicobar Isles {Doherty) ; N.-E. Sumatra; Celebes; 
Yamna, near Humboldt’s Bay, North New Guinea {coll, de Niceville). 
Expanse : 9 , 1*2 inches. 
Description: Female. Upperside,/ omimzy plumbeous ; with a largo 
metallic iridescent silvery-blue discai area, which reaches into the 
posterior half of the discoidal cell, and occupies the base and inner 
margin of the wing. Hindwing plumbeous, but the basal two-tliirds 
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, inw T ardly 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 ; Bleheius 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, bat I cannot 
