Family XVI. AGELAINAE. MARSH BLACK-BIRDS.
GENUS II. MOLOTHRUS, Swains. COW-BIRD

Bill rather short, very stout, moderately compressed, conical; upper mandible with the dorsal line slightly convex, its ridge flattened for half its length, afterwards narrow, sides convex, edges direct, tip rather acute; lower mandible with the angle short and wide, the dorsal outline ascending, straight, sides erect and convex, edges involute, tip acute; gap-line gently ascending for a third of its length, afterwards direct. Nostrils small, elliptical. Plumage blended, glossy. Wings rather long, pointed, the second quill longest, the first almost equal. Tail of moderate length, the feathers broad and rounded.