PLATE XVIII. 



Male Genitalia — 



1. Lateral view of Tibicen linnet. 



2. Caudal view of Tibicen linnei. 



3. Lateral view of Tibicen pruinosa. 



4. Caudal view of Tibicen pruinosa. 



5. Lateral view of Tibicen lyHcen. 



6. Caudal view of Tibicen lyHcen. 



(354) 



