18 



III 



EXAMINE THE ANTENNA. 



A structure, which is important, as being peculiar to Christophers' 

 protanopheline division, may sometimes be useful for differentiating two species. 

 This structure is the strongly branched hair on the inner aspect of the antenna. 



If, 



I. the hair is present 



2. the hair is absent 



the species is, 



barbirostris, or 

 sinensis, or 

 umbrosus, or 

 aitkeni 



albirostris, or 

 maculatus, or 

 karwari, or 

 kochi, or 

 ludlowi, or 

 rossi, or 

 fuliginosus. 



