THE SOLDIERLESS TERMITES OF AFRICA 



223 



dimensional similarity of the two species is illustrated by their closeness in the plots 

 of canonical variates (Text-figs 607 and 608) and of principal component scores 

 (Text-fig. 610). The abdomen of the worker caste is dehiscent throughout the genus. 



Keys to Species 

 Imagos 



1 Postclypeus slightly less inflated, Pcl/R A , 1-82-2-45; complex ratio of mandible and 

 notal measurements Li/M.N, 1-26-1-52. Abdominal stigmata usually paler than 

 surrounding tergites and sternites. (Distribution, W. Africa, Nigeria to Gambia) 



cavator (p. 224) 



- Postclypeus slightly more inflated, Pc1/Ra, 2-37-3-00; complex ratio Lj/M.N, 

 1-50-2-05. Abdominal stigmata usually darker than surrounding sclerites. 

 (Distribution, E. African, Uganda to N.E. Tanzania). . . . fossor (p. 226) 



Workers 



1 Enteric valve with internal cushions retracted, distal ends armed with numerous 

 prominent but fine spicules, and similar spicules on smooth membranous wall of 

 valve between and beyond cushions; proximal parts of cushions smooth and 



imago 



v.1 



worker 



o " o 



o 



v.2- 



v.1 



both combined 

 v.1 



• • 



v.2- 



V.4- 



o ■ • 



610 



v.3 



imago 



v. 5, 



v.3 



v.4. 



o 

 o 



-v2 

 v.1 



t * 



Fig. 610. Aderitotermes, distinction between A. cavator (rings) and A. fossor (spots). 

 Plots of principal component scores (transformed variables) corresponding to first to 

 fourth latent roots of correlation matrices of worker and imago, first and second of 

 both castes combined, and fifth of imago alone. Only on the fifth was there clear separa- 

 tion of imagos. The largest weighting coefficients of the fifth eigenvector attached to 

 the meso- and metanotal widths, providing the complex discriminant ratio Li/M.N 

 used in the key. 



