PLATE XVIII. 

 MALE GENITALIA. 



1. Lateral view of Tibicen linnet. 



2. Caudal view of Tibicen linnei. 



3. Lateral view of Tibicen prtiino'iaa. 



4. Caudal view of Tibicen pruinosa. 



5. Lateral view of Tibicen lyricen. 



6. Caudal view of Tibicen lyricen. 



(354) 



