Pelasgians origins

Regarding the origins of the Pelasgians, thought you people may like
this

Palaechthon and Pelasgus 1.

Palaechthon is the father of Pelasgus 1, after whom the Pelasgians,
inhabitants of the Peloponnesus, were called. Pelasgus 1, who some call
son of Zeus & Niobe 1, and others Autochthonous, (Sons of the Soil) is
remembered as the king of Argos to whom the first Danaans (Achaeans)
came.

Aes.Supp.250.
Aes.Supp.250 and passim; Apd.2.1.1, 3.8.1;
DH.1.11.2; Pau.8.22.1.

Also does anyone know of Phlastia? Aparently it was near Scyron (near
Corinth). Another PLST word.

Regards

John