I'm thinking female, even though it looks like one of the spermathecae is bent down. She had chewed on it quite a bit by the time I found it. Top is lighted from the front and bottom is lighted from the back.
Freshly molted N. tripepii. If I hadn't sexed the molt to confirm that she's female, I'd think this was male. Just goes to show that ventral sexing isn't always obvious and you should always check the molt!