What is "napaeae"

In Greek mythology, the Napaeae ( Ancient Greek: ναπαῖαι, from νάπη; English translation: "a wooded dell") were a type of nymph that lived in wooded valleys, glens or grottoes. Statius invoked them in his Thebaid, when the naiad Ismenis addresses her mortal son Krenaios:

“I was held a greater goddess and the queen of Nymphae. Where alas! is that late crowd of courtiers round thy mother’s halls, where are the Napaeae that prayed to serve thee?”