OF SOME RHODESIAN TENEBRIONID J-!. 97 



The following koy shows at a glance the characteristics 

 distingnishino- the different species dealt with in this paper : — 



KEY TO KNOWN LARV.^ OF RHODESIAN TERRESTRIAL 

 TENEBRIONID.E. 



A. Anal segment smooth, without spines; pseudopodia wanting; 

 larvae cylindrical. 



Anomalipus plebeius, Pering. 

 AA. Anal segment bearing spines ; pseudopodia present ; larvae sub- 

 cylindrical or somewhat flattened. 

 B. Pseudopodia without spines. 



C. Anal segment spoon-shaped ; two terminal spines on 

 posterior margin large, recurved, and widely separate. 

 Emyon tristis, Fhs. 



CC. Anal segment not spoon-shaped ; spines roughly uniform 

 in size. 



Gonocephalum aequale, jE"/-., and 

 G. simplex, F. 



BB. Pseudopodia bearing spines. 



C. Anterior tarsal claw with a projection on outer margin. 

 D. Dorsal surface of anal segment distinctly hollow in 

 profile, with a strongly raised ridge bearing spines on 

 posterior and latero-posterior margin. Larva noticeably 

 hairy. 



Distretus amplipennis, Fhs. 

 DI). Dorsal surface of anal segment convex in profile with a 

 slightly raised ridge, bearing very small chitinous 

 processes on posterior and latero-posterior margin : 

 general appearance smooth and shiny. 

 Psam modes scrobicollis, Fhs. 

 P. si mills, P^rm^. 

 P. bate si, Haag, and 

 P. pierretti, Fhs. 



CC. Anterior tarsal claw without projection on outer margin. 

 D. Dorsal surface of anal segment distinctly hollow in 

 profile ; posterior and latero-posterior margins with a 

 raised ridge bearing spines. 



Trachynotus geniculatus, Haag, and 

 T. griseus, Fhs. 

 DD. Dorsal surface of anal segment straight or convex in 

 profile; no spine-bearing ridge on posterior and latero- 

 posterior margin ; posterior margin hairy without spines. 

 Zophosis boiei, Sol. 

 VOL. I. 7 



