Walter] 



CLASPING ORGANS IN HYMENOPTERA 



87 



Plate X 



Figures 27-35 



27. Cross-section through the costal vein at the place of insertion 



of the distal hooks of a young Sir ex gigas L Mag 



28, 29. The same section of an older specimen of the same 

 species 



30. The same cross-section of Apis mellifica L 



31. Pazatangential section, through the costal vein of Sirex gigas 



L., seen from above 



32. Cross-section through the costal vein at the place of insertion 



of the distal hooks of a young Vespa vulgaris 



23- The same section of a pupa of Vespa rufa L 



34. Cross-section through the posterior margin of the fore wing 



of Vespa rufa L 



35. The same section of a young imago of Sirex gigas L 



lified 280 



300 

 300 



140 



300 

 300 



300 

 300 



