TWO NEW SYNDICATED SERIES (CHECK local listings) seek fresh life from well-traveled stars chugging down old trails. Set in 1755, Hawkeye stars Lee Horsley (Matt Houston) as Natty Bumppo, the Hudson River Valley hero of James Fenimore Cooper's The Leatherstocking Tales. Lynda Carter (Wonder Woman) plays a settler's widow on whom noble Natty has set his keen eye. Lonesome Dove: The Series is a sequel to the esteemed 1989 miniseries. It follows young Newt Call (Scott Bairstow), who has left the Hat Creek Cattle Company and Livery Emporium to seek his own fortune in 1870s Montana. Christianne Hirt plays Hannah Peale, the object of his awkward affections. The pilot guest-stars Dennis Weaver as a champagne-sozzled Buffalo Bill Cody. Both these handsome but hokey shows are lifted above the television herd by rugged outdoor scenery and period atmosphere.