In a large bowl, sift together flour, salt, baking powder and sugar. In a small bowl, beat together egg and milk. Stir milk and egg into flour mixture. Mix in the butter and fold in the blueberries. Set aside for one hour.
Heat a lightly oiled griddle or frying pan over medium high heat. Pour or scoop the batter onto the griddle, using approximately 1/4 cup for each pancake. Brown on both sides and serve hot.