PLATE XVIII. 

 Male Genitalia — 



1. Lateral view of Tibicen lirinei. 



2. Caudal view of Tibicen linnei. 



3. Lateral view of Tibicen pruinosa. 



4. Caudal view of Tibicen pruinosa. 



5. Lateral view of Tibicen lyricen. 



6. Caudal view of Tibicen lyricen. 



(354) 



