A COMPARATIVE STUDY OF THE BRAINS OF THREE 



GENERA OF ANTS, WITH SPECIAL REFERENCE 



TO THE MUSHROOM BODIES 



CAROLINE BURLING THOMPSON 



Department of Zoology, Wellesley College 



FORTY-TWO FIGURES 



CONTENTS 



Introduction 



Material and methods 516 



The ant brain 518 



1. Historical account 518 



2. General anatomy 520 



Comparison of the brains of the castes ij 



1. The queen brain 521 



2. The worker brain 523 



3. The male brain 524 



The finer structure of the brain 



1. The brain sheath 524 



2. The protocerebral lobes 525 



3. The protocerebral commissures 527 



4. Ocelli, ocellar nerves, ocellar lobes 530 



5. The optic bodies 532 



6. The optic lobes 532 



7. The central body 533 



8. The 'tubercles of the central body' "..... 533 



9. The mushroom bodies or pedunculate bodies 535 



10. The antennary lobes, olfactory lobes * 546 



11. The tritocerebral lobes and the tritocerebral nerve 548 



12. The subesophageal ganglion 549 



Summary 550 



Discussion of results 552 



Bibliography 556 



515 



THE JOTTBNAIi OF COMPARATIVE NEUROLOGY, VOL. 23, NO. 6 

 DECEMBER, 1913 



