24 ARKIV FÖR ZOOLOGI. BAND 6. N:0 7 



Explanation of the plates. 

 Plate I. 



O. pojmli, pupa, dorsal view X 15. 

 » » ventral » X 15. 



Alimentary caiial of larva of O. fagi -X 15. 

 Part of the cuticle on dorsal side of larva of O. /^ft/// X 310. 

 O. popiili: larva, 1st stage, dorsal view X 30. 

 » » 2Dd stage, >> .> X 30. 



» » 4th stage, » » X 15. 



» » » » ventral » X 15. 



Part of cocoou of pupa, O. fagi X 220. 

 Pygidium of larva of O. fagi X 75. 

 Part of cuticle of same X 310. 

 Larva of O. fagi^ side view X 15. 



» of O. querciis, side view X 12. 

 Antenna, larva of O. popidi X 290. 

 » ' » » O. quercus X 290. 

 Fig. 16. Yentral prothoracic shields of O. fagi X 75. 



Plate II. 



O. fagi. larva, labrum and clypeus, dorsal view X 310. 



» Right lialf of labium with right maxilla. ventral 

 view X 220. 



» labrum and clypeus ventral view X 310. 

 O. quercus labrum and cljq^eus, dorsal view X 203. 

 » » » » ventral » X 310. 



O. popidi, head capsule, dorsal view. 

 O. quercus, left maxilla, ventral view X 310. 

 O. popidi, top of left maxilla, ventral view X 310. 

 O. populi, top of labium, inner side X 310. 

 O., quercus, left half of labium, ventral view X 203. 

 O. popidi, labrum and clypeus, dorsal view X 310. 



» mandible, ventral view X 310. 



» » dorsal view X 310. 



