Negress n. : A black woman; a female negro.

Example:
Does anyone know where I can get a reasonably priced copy of "I Am a Martinican Woman & the White Negress"?

Taxonomy
New York, the Negro, the American, neutral term, neutral, offensive, American Negro, late 1960s, African American, black person, Washington, free encyclopedia, racist, commonly used, slur, 1970s, adjective, skin color.

Defination from the web:
... A specifically female form of the word—negress (sometimes capitalized) —was sometimes used; but, like another gender-specific word "Jewess", it ...