PLATE C 



EXPLANATION OF FIGURES 



36 Middle part of the brain of a nymph with eleven antennary segments, 1.6 

 nun., reproductive type; showing the frontal gland with both hypodermal cells 

 and basement membrane, and the fontanel nerve. 



37 Middle part of the brain of a nymph with eleven antennary segments, 1.6 

 mm., worker-soldier type; showing the frontal gland, in this region consisting of 

 the empty basement membrane, and the fontanel nerve. 



148 



