Here is what the next few months has in store for those of you who like to be the first to try new restaurants: The Loup de Mer, a new seafood restaurant with a fish market and outdoor cafe, will be opened by Dominique d'Ermo, at Connecticut Avenue and L Street NW, over the Metro entrance, around June 1. The American Cafe is opening on Capitol Hill, at 227 Massachusetts Ave. NE, in April. A smaller version of the Bread Oven, with bread and pastries made on the premises and a small choice of French dinners changing according to what is seasonal, will replace Positano in Bethesda around mid-March; prices will be in the $8.50 to $9 range. Barbara Witt, of The Big Cheese, is planning a new restaurant in Sutton Center, next to Foxhall Square, around July; look for an emphasis on grilling fish and light meats with fresh herbs, and the caloric richness available primarily in appetizers and desserts. Nora's (for Nora Pouillon, the originator of the Tabard Inn's restaurant) has probably already replaced the Cafe Lovcen on Florida Avenue. By mid-January, the winter had been packed with openings of new restaurants. Of recent vintage are three small Italian restaurants: Spencer's, above Georgetown's La Ruche; Marshall's West End west of Washington Circle on Pennsylvania Avenue; and Nido, 4712 Wisconsin Ave. NW. As usual, French restaurants have been sprouting with each rain. Maxime in Mazza Gallerie is the newest spinoff of the Capitol Hill La Ruche (also renamed Maxime). La Sorbonne opened on the same block of Pennsylvania Avenue as Marshall's. Maison Blanche has brought a prominent French chef from New York for its prominent location across the street from the Executive Office Building. In Georgetown, the Gate Soup Kitchen has become Chez Maria, a French-Vietnamese restaurant. Georgetown also has a new Latin American restaurant, Argentina 78. In the Dupont Circle area is Stephanie's and the Planet, a Superman theme restaurant with a third floor Press Room and an outdoor cafe planned, the menu being "cuisine minceur and international daily specials." It will be interesting to see if this one flies. Finally, up Connecticut Avenue is the Brown Derby.