The two species made known in the present paper were collected at Tandjong Morawa, Serdang, in N. E. Sumatra by Dr. B. Hagen. The first of these is noteworthy on account of being the only Eastern species of the subfamily Mystropinæ as yet described, all the others being South American, with the exception of Mystrops dispar of Erichson, which is from Madagascar. The types of both these insects are in the collection of the Leyden Museum.