100 Birds of Colorado 



Key of the Families and Geneea. 



A. Toes with a marginal web like a Coot {Phaleropodidce). 



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. 



a^ Bill long, far longer than the head ; without a dertnun 

 {RecurvirosiridcE). 

 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 {Glmradriidce). 

 a^ A small hind-too 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. 



iEgialitis, p. 134. 

 b^ Tail at least half the wing, strongly graduated. 



Oxyechus, p. 132. 

 b* Without black bands or patches. Podosacys, p. 135. 



b. Tarsus with transverse scutes in front and behind 



(Scolopacidcs). 

 a^ Hind toe present. 



a- Ear-opening below the eye. 



a' Three outer primaries attenuated. Philohela, p. 107. 

 b^ Three outer primaries normal. 



a* Sixteen tail-feathers, plumage streaky. 



Gallinago, p. 109. 

 b* Tweh'e tail-feathers, plumage mottled. 



Macrorhamphus, p. 111. 

 b^ Ear-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, 

 a* Cuhnon distinctly shorter than the tarsus, 

 a* Tail long, about half the wing, graduated. 



Bartramia, p. 125. 

 b^ Tail short, loss than half the wing, even. 



Totanus, p. 120. 



