INDEX TO KEY. 



PAGE 



Group 1. Birds having wings from 3.25 to 3.75 inches long . . 13 



Group 2. Birds having wings from 3.75 to 4.50 inches long . . 14 



Section 1. Toes 4, with small lobate webs . . . . 14 

 Section 2. " 4, " " webs (not lobate) between toes at 



base . . . . . ... . . 14 



Section 3. Toes 4, without webs ...... 14 



Section 4. "3, bill under .60 . . . . . 15 



Section 5. " 3, " over .60 15 



Group 3. Birds having wings from 4.50 to 5.50 inches long . . 16 



Section 1. Toes 4, a small web between toes; bill under 1.75 . 16 



Section 2. " 4, " " " " " over 1.75 . 17 



Sections. " 4, without webs ; bill over 2 . . . - 17 

 Section 4. "4, " " " over 1.10 and less than 



1.90 18 



Sections. Toes 4, without webs ; bill under 1.10 ... 19 



Section 6. " 3, bill over .60 20 



Section 7. " 3, " under .60 20 



Group 4. Birds having wings from 5.50 to 6.75 inches long . . 21 

 Section 1 . Toes 4, a small web between outer and. middle toe ; 



bill over 1.80 21 



Section 2. Toes 4, a small web between outer and middle toe; 



bill under 1.80 '. 21 



Section 3. Toes 4, with small lobate webs .... 22 



Section 4. " 4, without webs ; bill over 2 .... 22 



Section 5. " 4, " " " under 2 . . . . 22 



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