APPENDIX. 425 



[Note. There are many herons' eggs of the above color, hut they are all > 1*25 

 long. There are also many white eggs, tinged with blue (or green), and perhaps 

 among them should be included those of the Goshawk and Cooper's Hawk. Many 

 ducks' eggs are strongly tinged with blue, green, drab, or yellowish. Most of them 

 are laid on the ground or in hollow trees, but all are moi-e than an inch and three- 

 fourths long. Tlie only ducks commonly breeding in Massachusetts are the Dusky 

 Ducks, who build ou the ground, and the Wood Ducks, who build in hollow trees.] 



C. Color, brown, drab, or buff. 



(a). On the ground, except the last, and sometimes "3." 

 1. Av. 1-65X1'25, pale drab buff to rich reddish buff.* Partridge. §30,111. 

 (2). Av. 1-6.5X1'35, brownish drab or paler.* Nest where dry. Prairie Hen. §30,11. 



3. Av. ]'i)0Xl"50, drab. Birds usually colonial in swamps. Bittern. 



4. < -ToXao; usually marked. Nest among reeds. L-b Marsh Wren, §7, II, B. 



(h). In the holes of trees, or rarely in a nest made in a fork. 

 1. About 2-00Xl"50. Yellowish-white, or very pale drab. Summer Duck. 



* Often somewhat marked. 

 For § II of this Key, see the next page. 



