This is (apparently) the only member of the carnea group that occurs south of the equator.  It has been considered to be an Afro-tropical species, ranging broadly across the African continent from Sudan in the north to the southernmost Cape.  It has also been collected from Ascension Island, in the northern South Atlantic Ocean.  However, recent evidence (see previous entry) suggests that C. zastrowi includes at least two song variants, which are now recognized as subspecies.  C. zastrowi zastrowi is the nominate form from southern Africa discussed here; a second subspecies is C. zastrowi sillemi, described above.  Shown below are fourSRUs of South African C. zastrowi, each consisting of a single very long volley of abdominal vibration, which an insect typically produces repetitively.  In a duet, the partner  inserts his or her SRU between the SRUs illustrated, resulting in a slower tempo of volley repetition — exactly as seen in C. z. sillemi   In fact, except for the greater length of each volley and greater spacing between the volleys, the song of C. z. zastrowi is very similar to that of C. z. sillemi  It is expected that songs of intermediate phenotype will be found in the vast region between South Africa and the Arabian Peninsula.

A publication describing C. zastrowi is listed under the section above about C. zastrowi sillemi (Cc5 generator).