176 
NORTH AMERICAN BIRDS. 
mottled with black, this forming a distinct marbling on crown 
and occiput, where the ground-color is lighter and clearer buff; 
lower parts immaculate pale buff. Length 8.00-9.10, wing 
6.00, culmen .80-.90, tarsus 1.50-1.60, middle toe .70. Eggs 1.47 
1.11, varying from light olive to deep cream-color, rather 
sparsely and irregularly speckled and lined with dark brown, 
black, and purplish gray. Hab. Western North America, east 
to the Great Plains; accidental in Florida. 
281. AZ, montana (Towns.). Mountain Plover, 
ce. Tarsus less than twice as long as bill, measured from anterior point of 
loral feathering; chest with a black, grayish, or rusty band, some- 
times interrupted in the middle portion. (Subgenus igialitis 
Bore.) 
d'. Nape crossed by a more or less distinct white collar. 
é'. Bill decidedly shorter than middle toe, very stout (except in 
44. dubia), its basal half light-colored (orange or yellow in 
life), except in 4. dubia. 
f?. A distinct web between base of inner and middle toes. 
Above grayish brown; forehead, ring round hind- 
neck, and lower parts white. Summer adult: 
Lores, fore-part of crown, and broad band across 
chest black (usually duller in female). Winter 
plumage: Similar to summer dress, but black 
markings replaced by grayish brown. Young: 
Similar to winter plumage, but feathers of upper 
parts margined terminally with light buff. Downy 
young: Above pale grayish brown, mottled with 
black; frontal crescent, collar round hind-neck, 
and entire lower parts white. Length 6.50-7.50, 
wing 4.65-5.00, culmen .48-.55, tarsus .95-1.05. 
Eiggs 1.26 x .94, pale dull buffy or olive-buff, 
speckled or irregularly spotted, chiefly on or 
around larger end, with dark brown or black. 
Hab. Whole of North America, breeding far north- 
ward; south, in winter, throughout West Indies, 
Middle America, and northern South America, to 
Brazil, Peru, and Galapagos... 274. A=. semipal- 
mata Bonar. Semipalmated Plover. 
F*. No web between base of inner and middle toes. 
g'. Upper parts deep grayish brown, as in 4. semipal- 
mata. 
hi. Bill stout, the basal half light-colored (yellow or 
orange in life); no whitish bar behind black 
patch on fore-part of crown. (Plumage very 
similar, at all stages, to that of 4. semipal- 
