Explanation of Plate I. 



1. Silvius formosiensis Ric. 5. Chrysops sinensis Walk. 



2. Silvius dorsalis Coq. 6. Chrysops sinensis \Valk. (t) 



3- Chrysops mlokosiewiczi Big. 7. Chrysops snavis Loew. 



4- Chrysops dispar Fab. 8. Chrysops suavis Loew. ($) 



