THE SOLD1ERLESS TERMITES OF AFRICA 135 



Right mandible, apical to second mar- 

 ginal (R,) 0-13 



Right mandible, second marginal to 



molar (R m ) ..... 009-0- 10 



Mesonotum width (M) . . . 0-40-0-46 



Metanotum width (N) . . . 0-30-0-46 



Worker. Head capsule yellow, pilosity sparse and scattered, orange. Postclypeus moderately 

 inflated, Pcl/W, 0-27, Pcl/Ri, 237. Left mandible with subsidiary marginal tooth larger and 

 more prominent than third marginal, separated from molar prominence by wide deep notch in 

 surface view, complex ratio, La/Li. L m , 6-42 ; first marginal tooth of right mandible with anterior 

 edge slightly longer than that of second, Ra/Ri R m . 10-13. Enteric valve armature of positions 

 3 and 4 with 7-12 pronounced spines, carried on slightly sclerotized cushions, and many small 

 and minute spines; positions 1 and 2 with 1-3 pronounced spines, cushions unsclerotized, many 

 small and minute spines. Membranous wall of valve beyond cushions with minute spicules. 

 Other characters as in generic diagnosis. 



Measurements (one specimen) in millimetres. 



Head width (W) . . . .111 



Fore tibia width (T w ) . . . 013 



Fore tibia length (Tj) .... 0-78 



Postclypeus length (Pel) . . . 0-30 



Left mandible, apical to first marginal (La) o-io 



Left mandible, first to third marginal (Li) . 0-17 

 Left mandible, third marginal to molar 



(L m ) 009 



Right mandible, apical to first marginal 



(Ra) 011 



Right mandible, first to second marginal 



(Ri) 013 



Right mandible, second marginal to 



molar (R m ) ..... 0-08 



The distinguishing features of A. trestus have already been discussed in com- 

 parison with A. kilimandjaricus. The asymmetrical development of the enteric 

 valve armature in the worker may represent an early stage in the development 

 of a valve like that of Anaorotermes. The abdomen of the worker caste shows 

 signs of being dehiscent in some specimens. 



Holotype $ imago, paratype $ and $ imagos, and workers from type-colony, 

 Kenya: Narok District, Mara, 9 miles from Olokurto, 16.V.1961 (P. E. Glover) 

 coll. No. G7553) in British Museum (Natural History). 



There is no biological information on the single known nest-series. 



AGANOTERMES gen. n. 



(Aganos, Gr., 'mild, gentle') 

 Type-species : Aganotermes oryctes sp. n. 



Imago. Large-sized, W, 1-11-1-23. Fore tibia with three apical spurs, third well developed, 

 a little shorter than other two. Apical teeth of mandibles long, La/Li, 0-79-0-83, Ra/Ri, 

 i-ll— 1*19; subsidiary marginal tooth of left mandible with proximal end just level with edge 



