The 8th String Quartet was written in Rio in 1944, and dedicated to the Quarteto Iacovino.
Movements:
String Quartet
Published by Ricordi, Milan.
Villa-Lobos, Heitor. 1949. VIII. quarteto: per violino I, violino II, viola e violoncello. Milano: Ricordi
You can listen to the Quarteto Amazonia playing Quartets 8, 9, & 10, streamed on the Internet on this page of the Radio UOL website.
The premiere performance was by the Quarteto Iacovino, on September 5, 1946, in Rio.
There are four records in the Villa-Lobos Concerts database for this String Quartet as of August 2009.