Borders Group Inc reported another quarterly loss as the second-largest U.S. book store chain continued to grapple with lower sales and the shift to digital bookselling.

Borders reported a net loss of $46.7 million, or 67 cents a share, for the second quarter ended July 31, compared with a loss of $45.6 million, or 76 cents a share, a year earlier.

Excluding discontinued operations, the loss was 74 cents per share, compared with a loss of 75 cents a year ago.

Sales fell 11.5 percent to $526.1 million. Sales at its superstores open at least a year, or same-store sales, fell 6.8 percent.

Borders launched its own e-bookstore in early July in a bid to win a share of the fast-growing e-books market and catch up to rivals such as Barnes & Noble Inc and Inc .

(Reporting by Phil Wahba; editing by John Wallace)