416 CLAUDE FULLER. 



bands. To define these the term " frontal folds '' has been 

 introduced. 



In certain species, especially in Hodotermes, the post- 

 genfe are very large and profoundly differentiated from the 

 geufe. In most other species, however, all trace of differen- 

 tiation is either lost or but slight indications are present ; 

 as in the transverse wrinkles exhibited by Termes swazife 

 and the colour differentiation in Termes waterbergi. 

 Owing to the flatness of the head it is very desirable to 

 describe the ventral aspect, and, as an aid towards this end, 

 the term " ventral-genae " has been improvised to indicate 

 the whole of the cheeks lateral to the gula. 



The Head. — In the soldier caste it may be said that the 

 head is a simple cylindrical capsule composed of two pieces — 

 the epi-cranium and the gula — with a supporting tentorium. 

 As a consequence, the regions to which the names of sclerites 

 are apportioned must be regarded as indefinite and merging 

 into those adjoining tlieni. 



The accompanying diagrams of heads of Hodotermes 

 and Termes will suffice to illustrate the approximate areas 

 to which sclerite names have been applied. As a matter of 

 convenience, the term '' epistome " has been retained and 

 applied in the restricted sense of a separate piece behind the 

 labrum attached to the front margin of the clypeus. In the 

 soldiers this is but a thin plate-like extension of the clypeus 

 and is included as a part of the clypeus in the descriptions. 

 In most of the workers discussed (and in the imagos) it is, 

 hoAvever, a large and well-defined region calling for a special 

 and particular definition. 



The labrum of the soldiers and workers of Hodotermes 

 appears to be always simple. There are, however, many 

 instances in which the labrum of common acceptance is in 

 part the epipharynx. Thus in the soldiers of Termes 

 swazias, waterbergi and natalensis the labrum termi- 

 nates in a fleshy cordiform tip to which I have applied the 

 term " lingula." This is simply a prolongation of the epi- 

 pharynx. Again in Eu termes bilobatus, the labrum of 



