BRAIN OF THE 'WHITE ANT' 561 



segment is shorter than in the female (B). The posterior mar- 

 gin of the ninth segment is concave and two slender cerci are 

 present on the lateral sm-faces of the tenth segment. 



In the adult female (fig. 1, B) the seventh segment is very 

 long, with a rounded posterior edge, and completely covers the 

 eighth and part of the ninth segment. Jointed cerci are borne 

 on the sides of the tenth segment. 



In all female nymphs (fig. 1, C) and also in the female workers 

 and soldiers, the seventh segment, although long, does not com- 

 pletely cover the small indented eighth segment. Cerci similar 

 to those of the male are borne on the median surface of the 

 ninth segment and also on the lateral surfaces of the tenth 

 segment. 



fJENERAL ANATOMY OF THE TERMITE BRAIN 



The present paper will discuss the brains of the nymphs of 

 the first and second forms, the true sexual adults, and the workers 

 and soldiers. 



It is generally thought today that the insect brain includes 

 six regions, corresponding to the embryonic segments of the 

 head, three of which are supracsophagcal, namely: the proto- 

 cerebrum, the deutocerebrum, and the tritocerebrum, and three 

 subesophageal, the mandibular, the maxillary, and the labial 

 ganglia. Holmgren ('09) finds these six regions in the termite 

 brain and discusses at some length the origin of the labrofrontal 

 nerves, which he decides is in the tritocerebrum. It need only 

 be remarked here that the same six regions may be distinguished 

 in Leucotermes, and that in agreement with Holmgren I find the 

 labrofrontal nerves arising from the tritocerebrum. Table 2 

 names the regions and the parts that are present in the brain 

 of L. flavipes. 



Figure 2 is a diagram of the brain of L. flavipes, as seen from 

 the frontal surface. The supraesophageal ganglion is drawn 

 from an entire mount of a brain dissected out from the head of 

 a nymph with long wing pads; the ventral connectives, v.c, and 



