Is this what you mean?
https://books.google.gr/books?id=PXnHAAAAQBAJ&pg=PA224&lpg=PA224&dq=%22Ps.+Apollod%22&source=bl&ots=Tke_Vj7wl-&sig=V3flwREf9-udoufC84uMvDYCJZE&hl=el&sa=X&ved=0CB8Q6AEwAGoVChMI64zglOvqyAIVyNYUCh0cHQx_#v=onepage&q=%22Ps.%20Apollod%22&f=false
It refers to an ancient text called “Βιβλιοθήκη” (Library). It has been attributed to the ancient author Apollodorus, but there is considerable uncertainty whether he was theactual author. Hence Pseudo-Apollodorus (or Ps. Apollod).
--------------------------------------------------------------------------------------------------------------------------- Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.