Not much is known about Argia other than she was an Okeanid who wed Inakhos and bore Phoroneus.  Argia however is mentioned Hygenus' Preface. 

Parents

Okeanos & Tethys

Spouse & Lovers

Inakhos

Children

Phoroneus
Aegialeus
Io

Ancient Text

"...from Oceanus and Tethys [were born] the Oceanides--namely yaea, Melite, Ianthe, Admete, Stilbo, Pasiphae, Polyxo, Eurynome, Euagoreis, Rhodope, lyris, Clytia, Teschinoeno, Clitenneste, Metis, Menippe, Argia."

- Hyginus, Fabulae

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