New characters with special reference to male and female genitalia providing the basis for phylogenetic relationship of caystrine stink bug C. brunnescens Distant (Hemiptera: Pentaomidae) from lower Niger.

Presently some new characters i.e., metathoracic scent auricle and male genitalia including those of pygophore, paramere and inflated aedeagus and female genitalia including 1 st and 2 nd gonocoxae and spermatheca are described and illustrated. In the light of these new characters the phylogenetic relationships of C. brunnescens Distant is discussed within its subclade C. nigriventris (Germar)..