Remsen, J.V. 1975 Laughing Gull Larus atricilla May 6 Sloan's Lake, Jefferson Co., Colo.: 1 ad. in breeding plumage seen flying around the island in the lake where it had been discovered yesterday by Bruce Webb. Head: all black except for partial white eye-ring; did not seem to be as dark a black as that of Franklin's and Bonaparte's. Underparts - clean white. Wings - dark grayish, becoming blackish on wing-tips; white trailing edge to the wing; no white at all in the wing tip; legs - orange-red. Flight silhouette different from Bonaparte's or Franklin's - looks proportionately longer and more slender-winged, although this may be an optical illusion because of uniformity of wing coloration. Larger than Franklin's - about same size as Ring-billed Gull. Probably no more than five previous reports for Colorado