Add the langoustines to the skillet in a single layer. Pour the wine over them and cook until reduced by half, about 1 minute. Add the tomatoes and the reserved juice, crushed red pepper and salt and pepper. Cover and simmer over moderately low heat, stirring occasionally, until the tail meat is opaque, about 15 minutes. Stir in the basil and drizzle with a little more olive oil. Serve the langoustines with lemon wedges and a crusty baguette.