Company-wide revenues at The Neiman Marcus Group Inc increased 3.1 per cent to $256 million in June, up from $248 million in the same period a year earlier.             In the five-week June period, comparable revenues in the Specialty Retail Stores segment, which includes Neiman Marcus Stores and Bergdorf Goodman, increased 2.3 per cent. June 2002 revenues benefited from the shift of a men's sales event from May in the prior year the company said in a statement.