100 Birds of Colorado 
KEY oF THE FAMILIES AND GENERA. 
A. Toes with a marginal web like a Coot (Phaleropodide). 
a. Marginal web scalloped at each joint. Lobipes, p. 101. 
b. Marginal web even and continuous, not scalloped. 
Steganopus, p. 102. 
B. Toes without a marginal web. 
a. Tarsus with reticulate scales before and behind. 
al Bill long, far longer than the head; without a dertrum 
(Recurvirostride). 
a? Bill flattened and up-curved. Recurvirostra, p. 104. 
b? Bill acute, slender and straight. Himantopus, p. 106. 
b! Bill as long as, or less than, the head, ending in a hard 
convex swelling—the dertrum (Charadriide). 
a? A small hind-toe present. Squatarola, p. 130. 
b? No hind toe. 
a’ Upper-parts spotted, below black in summer. 
Charadrius, p. 131. 
b? Above plain coloured, below white. 
a* With black bands or patches on the fore-neck. 
a> Tail less than half the wing, nearly even. 
fgialitis, p. 134. 
b> Tail at least half the wing, strongly graduated. 
Oxyechus, p. 132. 
bf Without black bands or patches. Podosacys, p. 135. 
b. Tarsus with transverse scutes in front and _ behind 
(Scolopacida). 
al Hind toe present. 
a? Ear-opening below the eye. 
a® Three outer primaries attenuated. Philohela, p. 107. 
b? Three outer primaries normal. 
2! Sixteen tail-feathers, plumage streaky. 
Gallinago, p. 109. 
bt Twelve tail-feathers, plumage mottled. 
Macrorhamphus, p. 111. 
b? Eer-opening behind the eye in the normal position. 
a® Toes cleft to the base, without webs. 
a? Bill about equal to the tarsus. Pisobia, p. 113. 
b‘ Bill distinctly longer than the tarsus. Pelidna, p. 116. 
b’ Toes always webbed to a greater or less extent. 
af Culmen distinctly shorter than the tarsus. 
a5 Tail long, about half the wing, graduated. 
Bartramia, p. 125. 
b® Tail short, less than half the wing, even. 
Totanus, p. 120. 
