250 Syno2}sis of British Hymenoptera, 



PLATE XII. 



Fig. 1. Psithyrus campestris, $ armature. 



la. ,, ,, 7tli ventral segment. 



16. „ „ 8th 



2. ,, quadricolor, ^ armature. 



3. Bomhus Smithianus „ 



4. ,, cognatus ,, 



4 a. ,, ,, 8th ventral segment. 



5. ,, pratorum, ^ armature. 

 5a. ,, ,, apex of sagittte. 



5 b. ,, ,, 7tli and 8th ventral segments. 



6. ,, liortorum, ^ armature. 



7. ,, muscorum ,, 



8. ,, lapidarius ,, 



8 a. „ ,, apex of sagittae. 



'J. ,, pomormn, $ armature. 



10. ,, Derhaviellus ,, 



11. ,, sylvarum ,, 



12. ,. Latreillellus ,, 



12 a. ,, ,, 7th ventral segment. 



12 6. „ ,, 8th „ 



13. ,, terrestris, $ armature. 



14. ,, soroensis ,, 



15. A;pis mellifica, S armature. 

 15 a. ,, ,, sagittae. 



15 b. „ „ „ laterally. 



