\s liUKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 249 



be silvery. Between all the nervules of the fore wings are very dark 

 brown curved lines or markings. 



Above vein 2 of the fore wings are also some small yellowish specks, 

 one near to the base and three round the end of the cell. Moreover some 

 yellow specks are visible under vein 2 near to the margin of the fore 

 wings. The hind wings without markings. 



On the underside the margins of the wings are yellowish brown 

 coloured, the remaining part being black. The femora and tibiae of the 

 hind legs bear long yellow bristles. For the sake of clearness I have 

 sketched this very remarkable insect (plate X). 



Phassus niger must be closely related to Pliassus purpurascens Moore 

 from Ceylon and to Phassus signifer Walk, from Sylhet, Burma, Borneo 

 and Java. It may be possible, that niger is only a Sumatran race of 

 signifer, but I think that the differences, also in the shape of the wings, 

 are too great. 



Leiden, 16 November 1915. 



