Explanation of Plate LXXX. 



Fig. 10. Hemithyrsocera fallax, Sauss. — Wing (drawn from all that 

 remains of the type in the Geneva Museum) showing the 

 small apical triangle and undistorted ulnar vein ; one 

 extreme of the range of variation in wing-structure in 

 this genus. The wing of H. massuae is practically 

 identical with this. 



11. Hemithyrsocera circumcincta, R. & F. — Tegmen, showing 



venation characteristic of this genus and of Thegano- 

 pteryx. 



12. Hemithyrsocera circumcincta, R. & F. — Wing. Note the 



conspicuous apical triangle with well-defined boundaries 

 and ulnar vein very slightly upturned at apex : the 

 other extreme of variation in wing-structure shown by 

 this genus. 



13. Hemithyrsocera circumcincta, R. & F. — Apex of abdomen 



of <$ from beneath. 



14. Hemithyrsocera neavei, sp. n. — Apex of abdomen of $ 



from beneath. 



15. Hemithyrsocera ridleyi, sp. n. — Apex of abdomen of $ 



from beneath. 



