256 ZOOLOGISCHE MEDEDEELINGEN — DEEL IV. 



XVIII. - A NEW CETHOSIA-FORM FROM BOETON. 



BY J. H. JURRIAANSE AND J. LINDEMANS, ROTTERDAM. 



Prof. J. F. van Bemmelen in Groningen has presented for the collection 

 Jurriaanse a beautiful male Cethosia, captured on the isle of Boeton in 

 Nov. '16, by Mr. N. H. Krans, medical officer of the Royal Dutch Navy. 



Comparing this Cethosia with specimen in the collection of the Ley- 

 den Museum of Natural History, we found there a female, captured on 

 the same isle by Mr. T. Elbert in 1909. As it happened that this spe- 

 cimen was also quite different from all others and no descriptions or 

 figures could be traced in the present littérature, we suppose that we have 

 to do here with a new sub-species, closely allied to the species myrina Feldr. 



Dr. van Oort the director of said Museum has been kind enough to 

 lend this female specimen for description. 



The following characteristics indicate those specimen: With this form 

 the discal white spot on the hind-wing is missing (which spot is iden- 

 tical with the Cethosia spec, from Celebes), only the female shows there 

 a somewhat lighter shade. 



Contrary to myrina, where the post-discal band is composed of a row 

 of more or less heart-shaped spots, the male and female show here a 

 band of fairly equal width, only broken at the nervures. 



We think we have to do with a new sub-species of the genus Cethosia 

 and propose to name it: 



Cethosia myrina Bemmeleni. 



Male. Upperside, fore wing: The cell crossed by alternate bands 

 of reddish brown and black. The post-discal part between veins 7 and 2 

 with long light gray streaks on blackish, a single sub-terminal band of 

 narrow brownish gray lines parallel to outer margin. The terminal part 

 with Y-shaped lunules of same colour on a somewhat darker ground. 

 Apex blackish brown. Basal and sub-basal part below cell reddish brown, 

 at base brilliant iridescent blue, with a blackish spot from medial nervure, 

 pointing inwards and nearly touching the sub-median nervure. One black 

 spot between veins 3 and 2 and two lighter spots between veins 2 and 1. 



Hind wing: Rich reddish brown with darker clouded base, with 

 black spots partly shining through from underside. Base shining brilliant 

 with iridescent blue. A slightly darker discal-band from apex till anal 

 angle. A broad dark band from apex to anal angle with a broken sub- 

 terminal line brownish yellow. Terminal part with a row of slender 



