1891.] LYCiENID.E OF THE SOLOMON ISLANDS. 363 



The only difference I can detect in a good series of specimens is 

 a slight one in the size of markings below. 



Nacaduba DION, Godt. Enc. Meth. ix. p. 655 (1823). 



Rubiana I. Ugi I. 



The four specimens before me are females, and without seeing a 

 male I think it better not to describe them as a new species. They 

 seem to differ slightly from that sex of iV. dion from N. Australia by 

 having two large black spots with broad orange borders and metallic 

 silvery-blue scales at the anal angle of hind wing below. 



Nacaduba vincula, sp. n. (Plate XXXI. fig. 18.) 



Male. Upperside dull liglit greyish blue, having a hairy appear- 

 ance like C. platissa, Herr.-Schaff., very narrowly edged with black ; 

 cilia greyish, darker at ends of nervules. Underside rich dark 

 chocolate-brown, with darker white-bordered bands. Primaries with 

 a band in the middle of the cell, commencing on the costa and 

 reaching below the median nervure ; a rather wider band at the end 

 of the cell having a small lengthened spot on the costa immediately 

 over it ; beyond these a somewhat irregular semicircular macular 

 band commencing on the costa, gradually widening to opposite the 

 cell and reaching to the submedian nervure, where it is narrowest ; 

 the ground-colour outside the inner edge of this band suffused with 

 white scales ; a large marginal row of oval lunulas with a faint grey 

 line running through them. Secondaries blackish at the base ; an 

 irregular basal band and beyond this, commencing on the costa, 

 another which may be said to end on the median nervure, beyond 

 this another which commences on the subcostal and gradually 

 narrowing reaches the anal margin about the end of the abdomen ; 

 a submarginal row of triangular lunules and a marginal row of 

 oval lunules encircled with white ; a large reddish-orange spot near 

 the anal angle bordering inwardly a small black spot partly covered 

 with metallic green scales. 



The outer margins of both wings very narrowly black ; cilia as 

 above. 



Head, thorax, palpi, and legs black ; antennae annulated with 

 white. Abdomen brownish above, light buff below. Eyes densely 

 hairy, vdth a pure white spot between them. 



Expanse If inch. 



Fauro I. 



I have only seen one specimen of this fine insect, which is allied 

 to A^. lineata, Murray, N. Australia, and N. palmyra, Feid. It may 

 be distinguished from the male of iV. lineata (whicii I have seen 

 nowhere described) by its larger size, by the different colour, and 

 prominent white borders to the bands below, and by the outer margin 

 being rounded, not nearly straight as in that species. 



It is probable that the female will prove to have a broad white 

 band on the primaries. I have examined the neuration of these 

 species, and find that the first subcostal nervure is anastomosed 

 with the costal nervure much as in typical Nacaduba. The following 



