F 'g- 6 
Fi g- 7 
Fig. 8. 
Fig- 9 - 
explanation of PLATE XIII 
Plan of labella (closed) as seen from the side, showing the 
relative position of the internal and external organs, x 200. 
Internal organs of right labelluni and distal portion of labial 
trough (r, r x ) as seen in optical section after dissection. 
x 250, about. 
Fhe same x 600, about. Sclerites forming labial trough 
omitted. 
Ventral external fringe or lip of the labella (left half) x 57 a 
