A story in Thursday's Washington Post incorrectly identified Loftus Carson as an administrative aide to Sen. Clifford P. Case (R-N.J.) Carson is a legislative assistant to Sen. Harrison A. Williams Jr. (D-N.J.).

Black and female congressional employees publicly criticized their bosses yesterday for failing to do enough to end job discrimination on Capitol Hill.

The criticism came from the Ad Hoc Committee of Senate Black Legislative Assistants and the Capitol Hill Women's Political Caucus in testimony before the Senate Governmental Affairs Committee.

Both groups complained that Congress in general, and the Senate in particular, engage in discriminatory practices outlawed for private employers.

"The Congress has, by a variety of civil rights laws, imposed equal employment requirements on . . . the private sector," said Lotus Carson, an ad hoc committee member and legislative assistant to Sen. Clifford Case (R-N.J.). "We believe that there is no defensible rationale which can be seriously maintained for continuing to exempt Congress from the substantative legal obligations of these statutes," he said.

Carson, who said Case supported his appearance, before the committee, said Congress' largely white "old boy" network has kept many women and minorities out of professional Hill jobs and has assigned "large numbers of blacks and other minority groups" to menial prositions.

For example, only 30 of the Senate's 1,100 profession employees - such as adminstrative assistants, staff directors and counsels - are black, Carsons said.

Olga Grkavac, who chairs the women's cascus, released a survey indicating that there has been no substantial improvement in salary discrimination against female Senate employees over the past three years.

In 1974 female Senate employees were making 5 per cent of the median annual salary of their male counterparts. The median income for women that year $10,260, compared with $17,670 for men, Grkavac said.

Today, she said, the median annual salary for Senate women in $12,755 and for men, $22,879. She said both salaries are higher because of cost-of-living increases granted to Senate employees since 1974.

"Still, in 1977, women's median salary is only 56 per cent of the salary of men" in the Senate, Grkavac said.

She said both studies "show evidence of pattern of discrimination" against women and urged the committee to work for legislation that "would bring all congressional employees under the kind of protection provided by . . . the Civil Rights Act of 1964."