PLATE 6 



EXPLANATION OF FIGURES 



The outlines of figures 32 to 40 were drawn with the camera, but the fiber 

 tracts are reconstructed from drawings of other sections. 



These figures, therefore, represent diagrams of the mushroom body fiber tracts 

 as if seen ija optical section. 



32 The fiber tracts of the mushroom bodies of the queen of Camponotus 

 pennsylvanicus. 



33 The fiber tracts of the mushroom bodies of the worker of C. pennsylvanicus. 



34 The fiber tracts of the mushroom bodies of the male of C. pennsylvanicus. 



35 The fiber tracts of the mushroom bodies of the queen of Formica schauf ussi. 



36 The fiber tracts of the mushroom bodies of the worker of F. schaufussi. 



37 The fiber tracts of the mushroom bodies of the male of F. schaufussi. 



38 The fiber tracts of the mushroom bodies of the queen of Lasius niger. 



39 The fiber tracts of the mushroom bodies of the worker of Lasius niger. 



40 The fiber tracts of the mushroom bodies of the male of Lasius niger. 



570 



