Index 



Asyndesmus lewisi, 381, 400. 

 Atriplex, confertifolia, 87. 

 lentiformis, 75, 94, 280. 

 polvearpa, 78, 84, 241 ; picture of, 

 282. 

 Atsatt, S. R., 31. 

 Auriparus fiaviceps flavieeps, 76, 82, 



211. 

 Avoeet, 120. 



Baccharis glutinosa, 70, 189. 

 Badger, 507. 



Mexican, 259. 

 Baeolophus inornatus inornatus, 387, 



403. 

 Bailey, Vernon, acknowledgment to, 



311, 321. 

 Barn owls, 26. 



Barriers, problem of, with regard to 

 birds and mammals, 107; classi- 

 fication of, 109; as agents in 

 multiplication of species, 110; 

 faunal, 407, 408, 410. 

 Bascanion flagellum frenatum, 42, 46, 

 48, 507, 509, 532. 

 laterale, 43, 46, 48. 

 Bassariscus astutus raptor, 354, 402. 

 Bat, brown, large, 268, 352. 

 canon, 267. 

 cave, 266. 

 foliage, oak, 317. 

 free-tailed, Mexican, 268. 

 Hollister, 263. 

 leaf-nosed, California, 269. 

 long-legged, 352. 

 lump-nosed, intermediate, 320. 



pale, 263. 

 pallid, desert, 263. 



little, Stephens, 265. 

 silver haired, 352. 

 Tejon, 318. 

 Bats, vespertilionid, Three New 



Races of, 317. 

 Batrachoseps attenuatus, 32S. 329; 

 measurements of, 330. 

 caudatus, measurements of, 330. 

 major, 327; measurements of, 330. 

 pacificus, 328; measurements of, 

 330. 

 Batrachoseps major and Bufo cog- 

 natus californicus, New Am- 

 phibia from Southern California, 

 327; literature cited, 334. 

 Bear, black, 353. 



Beaver, mountain, British Columbia, 

 499. 



Point Arena, 297. 

 Puget Sound, 497. 

 Trinity, 295, 296, 369; picture of 

 burrows of, opp. 394. 

 Beavers, nomenclature of, 417; 

 teeth of, as cutting and grind- 

 ing instruments, 426, measure- 

 ments of, 428; description of 



new subspecies, 429, 433; com- 

 parisons of, 437; comparative 

 measurements of adult skulls, 

 inset opp. 438; history of, 457; 

 relationships of, 460; of Califor- 

 nia, 462; of Eurasia and Amer- 

 ica, 463; semi-aquatic environ- 

 ment of, 464. See also Castor. 

 Beavers, The Status of the, of West- 

 ern North America, with a Con- 

 sideration of the Factors in 

 their Speciation, 413; summary, 

 487; literature cited, 490. 

 Beck, R. H., 1. 

 Bernicla oecidentalis, 6, 10. 

 Bighorn, desert, 218, 507. 

 Birds of the Colorado Valley, check- 

 list of, 110-113; general ac- 

 counts of, 113. 

 Birds and mammals of the Lower 



Colorado Vallev, 51. 



Blackbird, Brewer, "l64, 383. 



red-winged, Nevada, 383. 



Sonora, 161. 

 yellow headed, 160. 

 Bluebird, mountain, 389. 

 western, 216, 280, 389. 

 Blvthe Junction, California, pictures 

 of environments near, opp. 540, 

 542. 

 Boa, California, 41. 

 Bob-eat, 507. 



Bombycilla garrula, 187, 385, 405. 

 Branta canadensis, 10, 11. 



canadensis, 1, 2, 8, 13, 14, 15, 19; 



measurements, 16, 17, 18. 

 hutehinsi, 2, 13, 14, 15, 19; 



measurements, 16, 17, 18. 

 minima, 4, 13, 15, 19, 22, 24; 



measurements, 16, 17, 18. 

 oecidentalis, 1, 5, 8, 9, 13, 14, 19. 

 oecidentalis, 9. 

 Branta canadensis group, study of a 



collection of geese of the, 1. 

 Bryant, Harold C, 25. 

 Bubo virginianus pallescens, 65, 69, 



82, 86, 129. 

 Bufo alvarius, 509. 

 Bufo cognatus californicus, 331; 

 measurements of, 333. 

 cognatus, 331, 509; measure- 

 ments of, 333. 

 halophilus, 331, 512. 

 lentiginosus woodhousii, 332, 509. 

 punctatus, 507, 508, 509, 512. 

 Bunting, lark, 181. 

 lazuli, 181, 385. 

 Bush tit, coast, 387. 

 Buteo borealis ealurus, 69, 86, 125. 

 Butorides virescens anthonyi, 67, 119. 

 Calamospiza melanocorys, 181. 

 Cactus, giant, picture of, opp. 286. 



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