All the upper parts, and a transverse band on the breast, cinereous brown: tarsi and toes naked.
H. riparia, Temm. Man. d'Orn. torn. I. p. 429. Id. torn. III. p. 300. Sand Martin, Mont. Orn. Diet. Selb. Illust. vol. I. p. 125. pl. 42. f. 3. Bew. Brit. Birds, vol. I. p. 295.
Entire length five inches two lines: length of the bill (from the forehead) three lines, (from the gape) six lines; of the tarsus five lines and a half; of the tail two inches one line; from the carpus to the end of the wing four inches.
All the upper parts, cheeks, and a transverse band on the breast, cinereous or mouse-coloured brown: wings and tail inclining to dusky brown: throat, fore part of the neck, belly, and under tail-coverts, white: tarsi and toes naked, with the exception of a few small feathers near the origin of the hind toe. In young birds, all the upper parts of the plumage are edged with pale reddish brown; the tail-feathers with yellowish white. (Egg). White: long. diam. eight lines; trans, diam. six lines.
First seen about the beginning of April. More locally distributed than either of the preceding species. Found only in the neighbourhood of sand-pits and the high banks of rivers, in which situations it builds, excavating a horizontal hole in the loose soil to the depth of two or three feet. Nest placed at the extremity of the hole, formed of dry grass and straw, and lined with feathers. Eggs four or five in number.