520 
INDEX 
Dafila acuta, 197. 
Daption capense, 174. 
Darter, Little Blue. See Hawk, Sharp- 
shinned. 
Big Blue. See Hawk, Cooper’s. 
Darters, 181. 
December, birds of, 36. 
Decoration of nest, 74. 
Delaware Valley Ornithological Club, 23. 
Dendrocygna bicolor, 215. 
Dendroica sestiva sestiva, 448. 
auduboni auduboni, 451. 
cserulescens caerulescens, 449. 
cserulescens cairnsi, 450. 
castanea, 453. 
cerulea, '"452. 
coronata, 450. ' 
discolor, 460. 
dominica albilora, 456. 
dominica dominica, 456. 
fusca, 455. 
kirtlandi, 457. 
magnolia, 451. 
palmarum hypochrysea, 459. 
palmarum palmarum, 459. 
pensylvanica, 453. 
striata, 454. 
tigrina, 448. 
townsendi, 457. 
vigorsi vigorsi, 458. 
virens, 457. 
Dermestes, 21. 
Dichromanassa rufescens, 225. 
Dichromatism, 96. 
Diedapper. See Grebe, Pied-billed. 
Diomedea exulans, 173. 
Diomedeidae, 172; figured, 119. 
Distribution and food, 98. 
factors influencing, 27. 
factors governing local, 104. 
Diver, Great Northern. See Loon. 
Hell. See Grebe, Horned. 
Diving Birds, 138. 
Dolichonyx oryzivorus, 358. 
Dough-bird. See Curlew, Eskimo. 
Dove, Bermuda Ground, 285. 
Carolina. See Dove, Mourning. 
Ground, 284. 
Mourning, 100, 283. 
Turtle. See Dove, Mourning. 
White-winged, 284. 
Zenaida, 284. 
Dovekie, 149. 
Dowitcher, 247. 
Long-billed, 247. 
Dryobates borealis, 325. 
pubescens medianus, 325. 
pubescens pubescens, 325. 
villosus auduboni, 324. 
villosus leucomelas, 324. 
villosus terrsenovse, 324. 
villosus villosus, 323. 
Duck, Black, 192. 
Black-head. See Duck, Scaup. 
Blue-bill. See Duck, Scaup. 
Bridal. See Duck, Wood. 
Broad-bill. See Ducks, Scaup and 
Shoveller. 
Brown-legged Black, 192, 
Butter. See Bufflehead. 
Crow, See Coot. 
Duck, Dipper. See Bufflehead. 
Dusky. See Duck, Black. 
English. See Mallard. 
Florida, 193. 
Gray. See Gadwall. 
Greater Scaup, 202. 
Harlequin, 206. 
Labrador, 206. 
Lesser Scaup, 202. 
Long-tailed. See Old-squaw. 
Masked, 210. 
Pied. See Duck, Labrador. 
Raft. See Scaup, Lesser. 
Red-legged Black, 192. 
Ring-bill. See Duck, Ring-necked. 
Ring-necked, 203. 
Ruddy, 210- 
Rufous-crested, 198. 
Scaup, 202. 
Spoonbill. See Shoveller. 
Spirit. See Bufflehead. 
Summer. See Duck, Wood. 
Surf. See Scoter, Surf. 
Wood, 186, 197. 
Ducks, Molt of, 86. 
Dumetella carolinensis, 473. 
Dunlin, 253. 
Eagle, Bald, 302. 
Caracara. See Caracara. 
Golden, 301. 
Gray Sea, 302. 
Economic Value of Birds, 98. 
Ectopistes migratorius, 282. 
Eggs, collecting and preserving, 21. 
colors of, 78. 
number of, laid, 77. 
shape of, 78. 
size of, 78. 
variations of, 78, 79. 
Egret, 224. 
Peale’s. See Egret, Reddish. 
Reddish, 225. 
Snowy, 225. 
White,, 110. 
Egretta candidissima candidissima, 225. 
Eider, American, 207. 
King, 208. 
Northern, 207. 
Steller’s, 207. 
Elanus leucurus, 291. 
Empidonax flaviventris, 344. 
trailli alnorum, 346. 
trailli trailli, 346. 
virescens, 345. 
Enemies of nesting birds, 71. 
Environment as mold for habit, 73 
Ereunetes mauri, 254. 
pusillus, 253. 
Erismatura jamaicensis, 210. 
Erolia ferruginea, 253. 
Erythrism, 96. 
Euphagus carolinus, 365. 
Falco sesalon, 306. 
columbarius columbarius, 305. 
islandus, 303. 
mexicanus, 304. 
peregrinus anatum, 305. 
peregrinus peregrinus, 305. 
rusticolus gyrfalco, 304. 
