THE BKAIX AM) THE FRONTAL GLAND OF THE 



CASTES OF THE 'WHITE AXT,' LEUCO- 



TERMES FLAVIPES, KOLLAR 



CAROLINE HLRLING THOMPSON 

 De-pnrtmenl of Zoology, Wellesley College 



TWKN TV-SIX FKMKES 



CO NIK NTS 



Introdiicticjn 553 



Material and methods 554 



The itU'inl)(M-.s of the colony of L. Havipes 



1. The adult castes and the younn oiin 



2. Distinguishing characters of the five adult castes and of three types 



of nymphs 55S 



li. Means of distinguishing the sexes 560 



General anatomy of the termite hrain ... 561 



The finer structure of the hrain . . 564 



1. The hrain sheath 564 



2. The protocereliral lobes 564 



li. The mushroom bodies 566 



4. The cent ral body 570 



5. Ocelli and ocellar nerves 570 



6. The optic lobes 572 



7. The anteiuial lobes 574 



S. The tritocerebral lobes and the tritoct-rebral conmiissure 574 



9. The frontal ganglion 574 



10. The ventral coiuiectives and the subesopluigeal ganglion 576 



11. The frontal or fontanel glan<l and the fontanel nerve 576 



Summary of results 589 



Bibliograi)hy 592 



INTHODIC'TION 



This paper was iintlcitaken with the idea of studying the finer 

 structure of the brains of the tUfiferent castes of the common 

 termite or 'white ant,' and to compare them with the brains 

 of the castes of true ants, the chief point of interest being that 

 both termites and ants are social insects, Uving in communities 



553 



