INDEX 



451 



Two-striped locust (Melanoplus hiv- 

 ittatus or femoratus), 326, 327, 

 356-359, 404, 420. 



Two-striped walking-stick (Aniso- 

 morpha ferruginea), 425, 



Uhler's camel cricket (CeuthopM- 



lus uhleri), 423. 

 Utility and natural selection, 19-22. 



Variants, definition of, 272. 



Variation, color, in Orthoptera, 344- 

 347; hypothesis concerning, and 

 their heritability, 17-19, 32; or- 

 derly and indeterminate, 16; 

 theory of biometric school con- 

 cerning, 18, 19; size and color, 10. 



Varied wing locust (Arphia xan- 

 thopthera), characteristics, 328- 

 330, 351-354; habitat, 421; stridu- 

 lation, 290, 291. 



Vegetation, sequence of, 320-322. 



Viceroy butterfly (Basilarchia dis- 

 ippus), 119-126. 



Vireo, red-eyed, 244, 245. 



WALKiNG-stick (Diapheromera fem- 

 orata), habitat, 326, 327, 425; 

 protective resemblance, example 

 of, 76-82; Two-striped (Ani- 

 somorpha ferruginea), 425; 

 Blatchley's (Bacunculus Match- 

 leyi), 425. 



Wallace on antiquity of trees, 30 ; 

 mimicry, 20, 68, 117, 118; origin 

 of species, 6 ; protective resem- 

 blance, 67, 68, 70-72, 86; sexual 

 selection, 22 ; theory of colors 

 of animals, 70, 71, 137, 138, 142, 

 144. 



Walsh, reared Chrysis caerulans 

 from wasp cells, 208. 



Wandering jew (Commelina), in 

 dunes, 296. 



Warbler, yellow, 235, 236. 



Warning colors, see Color protec- 

 tion. 



Wasp, spiders, food of, 210, 214; 

 transfers pollen of butterfly 

 weed, 41; Varieties: Cicada-killer 

 (Sphecius spheciosiis ) , 216-218; 

 Crysis, 214; Golden sphex (Sphex 

 ichneumonea), 167, 195-201; 

 Jug-making (Eumenes fraternus), 

 206-209, 212; Odynerus, 214; 

 Pelopaeus, 212; Trypoxylon, 2^14; 



White-footed mud-dauber (Try- 

 poxylon albitarse), 209-214. 



Waste, definition of, 432. 



Weevil, example of color resem- 

 blance, 69, 101, 102; Acorn, 29, 

 174, 175; Nut (Balaninus nasi- 

 cus), 289; Ithycerus, 101, 102. 



Weir, on feeding larvae to birds, 

 137, 138. 



Weismann on markings of Sphinx 

 moth, 158, 159 ; mimicry, 117, 

 118; stridulating organs, 23; 

 theory of selection, 14. 



Whip-poor-will, 247, 248. 



White-footed mouse, habits of, 250, 

 251, 306. 



White-footed mud-dauber wasp 

 (Trypoxylon albitarse), 209-214. 



Whitman on De Vries' theory of 

 formation of new species, 13; ex- 

 periments with pigeons, 16. 



Wild carrot (Daucus carota), 32, 

 170-172. 



Wild chervil (Anthescus sylvestris), 

 and the orange-tip butterfly, 84. 



Wild lettuce, dispersal of seeds of, 

 28. 



Wings, locust, theory of size and 

 development of, 356. 



Witch-hazel, 49-54, 142. 



Wood, on the orange-tip butterfly 

 and wild chervil, 84. 



Woodland, dry open, definition of, 

 432 ; swamp open, definition of, 

 431. 



Woodland grasshopper (Xiphidium 

 nemorale), 428. 



Woodpecker, red-headed, 239-241. 



" Woollv bear," 176, 177. 



Wren, behavior of, 222, 223, 243, 

 248, 251; nest of, 248, 249, 251. 



Xerophytia, 432, 433. 



YELLOW-throat, Maryland, 224, 225, 



295. 

 Yellow warbler, 235, 236. 

 Yellow-wing locust (Arphia sul- 



phurea), 326, 328, 330, 421. 

 Yellow-winged sand locust (Trim- 



erotropis citrina), 330, 424. 

 Yellowish locust (Melanoplus flori- 



dus), 424. 



Zoo-geography, 322. 



