PLATE XIX. 



Male Genitalia — 



1. Lateral view of Tibicen marginalis. 



2. Caudal view of Tibicen marginalis. 



3. Caudal view of Tibicen resonans. 



4. Lateral view of Tibicen resonans. 



5. Caudal view of Tibicen auletes. 



6. Lateral view of Tibicen aidetes. 



(356) 



