External genitalia is considered as one of the most stable and reliable diagnostic character to identify a species and to separate the closely related species. In the present paper, spermatheca, a part of female genitalia has been chosen to illustrate its taxonomic significance. The variations in the shape of the structure, number of additional processes in spermathecal bulb, length of proximal and distal spermathecal duct etc. enable us to differentiate more closely allied species within a given taxon.