24 L. de Niceville — Butterflies from tJie Indo-Malayan region. [No. 1, 



nous ; bearing regularly over the surface darker red spots arranged 

 much as in typical species of the genus Arhopala, Boisduval, these spots 

 are disposed thus : — A small round one at the extreme base of the 

 wing; followed by a series of three single spots; then another series 

 of three, but these spots are double ; then four conjoined spots at the 

 extremity of the cell ; then a discal curved band extending across the 

 wing from the costa to the abdominal margin, broken only by the 

 first subcostal nervule; some obscure spots on the outer margin. 

 Female. Uppeeside, both wings marked almost exactly as in the male. 

 Underside, forewing differs from the male in having the discal macular 

 band more extensive and run together into a single undivided band, 

 anteriorly bounded by the subcostal nervure, posteriorly by the inner 

 margiu, along which it extends to the base of the wing. Hindwing 

 with the macular markings less conspicuous than in the male ; the 

 inner edge of the discal series of spots bears on the posterior half of 

 its length a series of black spots often found in the species of this genus. 



G. gigantes is not only the largest known, but is the most conspicu- 

 ously-marked species in the genus, and has no near ally. Were the 

 ground-colour of the upperside yellow, instead of pure white, it would 

 almost exactly resemble Terias Jiecabe. 



I have described the species from a male and two females in Dr. 

 Martin's and my collection, taken in the Battak Mountains of N.-E. 

 Sumatra, in August and November, and another pair in Mr. A. R. 

 Adams' collection taken at Penang. 



20. Gertdus GiETCLUS, n. sp., Plate V, Fig. 12, 9 . 



HABrrAT: Battak Mountains, N.-E. Sumatra. 



Expanse : 9 , 1*3 and 1"5 inches. 



Description : Female. Upperside, forewing pure white ; the costa 

 basally, and the base of the wing, dusky ; the apex very broadly black, 

 as is also the outer margin at the anal angle, but much more narrowly so. 

 Hindwing with the disc only white, the rest of the wing dusky ; the 

 disco-cellular nervules marked by a prominent blackish line. Underside, 

 fm-ewing with the disc white, the rest of the wing pale slate-colour ; three 

 increasing dark spots outlined outwardly with white in the discoidal 

 cell, a dark spot posterior to the middle one of these in the submedian 

 interspace ; three ring-spots on the costa ; a short subapical macular 

 band ending posteriorly in a separated round spot in the second median 

 interspace ; an oblique prominent spot at the anal angle ; a submar- 

 ginal series of black dots between the veins. Hindwing, pale slate- 

 colour, with the macular markings as usual in the genus. 



Nearest apparently to G. zinckenii, Felder, from Java, of which 



