BRAINS OF THREE GENERA OF ANTS 519 



The work of Janet has been confirmed by Jonescu ('09) who, 

 in the honey bee, finds in a similar position the nerve supplying 

 the inferior dilator muscle of the pharynx, and demonstrates the 

 origin of its two roots in two small fibrous masses and groups 

 of ganglion cells which he regards as the reduced tritocerebral 

 lobes (Jonescu '09, figs. 41-42). 



Table 1 gives the parts which may be distinguished in a typical 

 ant brain. 



TABLE 1 



The parts of the brain 



I. The supraesophageal ganglion 



A. Protocerebrum 



The protocerebral lobes 



„, X 1 1 • fl- aoterior, dorsal 



ihe protocerebral commissures i ^ , ■ i , 



[2. posterior, dorsal 



The optic bodies 



The optic lobes 



The ocellar lobes 



The central body 



[anterior roots 

 The mushroom bodies < central body roots 



[posterior roots 



B. Deutocerebrum 

 The antennal lobes 



C. Tritocerebrum. 



The tritocetebral ganglia 

 II. The subesophageal ganglion 



The ventral connectives 

 The mandibular] 

 The maxillary \ ganglion 

 The labial J 



The nerves of the head 



The optic nerves 



The ocellar nerves 



The antennal nerves 



™, , , . , , f the labral nerves 



ihe labro-irontal nerves < ,, r , , ^ xu c x i i- 



(^the frontal nerves to the frontal ganglion 



The recurrent nerve, and other smaller nerves arising from the frontal 



ganglion 



The tritocerebral nerve (inferior dilator of pharynx) 



The mandibular nerves 



The maxillary nerves 



The labial nerves 



The accessory nerves (?) 



The salivary nerves 



