282 BLACK-BELLIED PLOVER. 
Trinca HELVETICA, Linn. Syst. Nat. vol. i. p. 250.—Lath. Ind. Ornith. vol. ii. 
p. 728. 
Trinea squatarora, Linn. Syst. Nat. vol. i. p. 252.—Lath. Ind. Ornith. vol. ii. 
p- 729. 
Biack-BELLIED PLover, CHARADRIUS HELVETICUS, Wils. Amer. Ornith. vol. vii. 
p- 41, pl. 59, fig. 4. Summer. 
CuaRaDRIUS HELVETICUS, Ch. Bonaparte, Synopsis of Birds of United States, 
p. 298. ‘ 
Grey Lapwine, VANELLUS MELANOGASTER, Richards. and Swains. Fauna Bor.- 
Amer. vol. ii. p. 370. 
BiackK-BELLIED or Swiss Prover, WVwitall, Manual, vol. ii. p. 26. 
Adult Male in summer. Plate CCCXXXIV. Fig. 1. 
Bill as long as the head, straight, somewhat compressed, stout. 
Upper mandible with the dorsal line straight and slightly sloping for 
more than half its length, then bulging a little and arched to the tip, 
which is rather acute, the sides flat and sloping at the base, convex to- 
wards the end, where the edges are sharp and inclinate. Nasal groove 
extended to a little more than half the length of the mandible ; nostrils 
sub-basal, linear, open and pervious. Lower mandible with the angle 
rather long and narrow, the sides at the base erect and nearly flat, the 
dorsal line ascending and slightly convex, the edges sharp and involute 
towards the narrow tip. 
Head of moderate size, roundish, the forehead much rounded. 
Eyes large. Neck rather short. Body ovate, rather full. Feet rather 
long, slender ; tibia bare for a considerable space ; tarsus rather com- 
pressed, covered all round with reticulated hexagonal scales; toes of 
moderate length, slender; the first extremely diminutive, with an 
equally minute claw; the second shorter than the fourth, which is 
much exceeded by the third ; the anterior toes are rather broadly mar- 
ginate, the web between the third and fourth extending to the second 
joint of the latter, that between it and the second smaller. Claws 
small, compressed, slightly arched, acute. 
Plumage soft, blended, the feathers broad and rounded. Wings 
long and pointed, primary quills tapering, the first longest, the second 
a quarter of an inch shorter, the rest rapidly graduated ; secondaries 
short, broad, obliquely rounded; the inner tapering and elongated. 
Tail rather short, slightly rounded, of twelve rounded feathers. 
Bill and claws black. Iris and feet greyish-black. Forehead 
