Index 



Tyrranidae, proximal barbules, 267; 



feathers, 381. 

 Tyrannus, color modifications, 383. 

 verticalis, yellow color, 277; red 



color, 277; color modifications, 



383. 

 Umbilicus, inferior, and superior 



(umbiliciform pit), definition, 



250. 

 United States National Museum, 



acknowledgment of material, 



246. 

 Upupa indica, feathers, 370. 

 Upupidae, feathers, 370. 

 Uria troille, feathers, 357; figures 



of barbules, opp. 428. 

 Vane (vexillum, web, pogonium), 



definition, 251. 

 Vanule, definition, 253. 

 Ventral ridge, definition, 252. 

 Ventral teeth of barbules, definition, 



254. 



Vertebrates, taxonomic value of in- 

 tegumentary structures, 247. 



Vertical Distribution, The, and 

 Movements of the ScMzopoda 

 of the San Diego Region, 123; 

 bibliography, 145. 



Vireonidae, feathers, 381. 



Vulturidae, feathers, 336. 



Water birds, plumules, 258. 



Waxwing, red color, 277. 



Wiedersheim, E., cited on frog anat- 

 omy, 168. 



Woodworth, C. W., 39. 



Zeleny, C, and Mattoon, E. W., cited 

 on inheritance, 513. 



Zenaidura, down, 361; color modi- 

 fications, 362. 

 macroura, feathers, 359; figures of 

 barbules, opp. 430, of down 

 barbules, opp. 444. 



ERRATA 



Page 36, line 5 from bottom. For asiastica read asiatiea. 



Page 49, line 4. For Cysloposthium read Cyeloposthium. 



Page 381, line 29. For Frigillidae read Fringillidae. 



Page 389, line 8 from bottom. For Galibulidae read Galbulidae. 



Page 442, line 5. For rubra read ruber. 



Page 449, line 23. For Lepus europaeus read Oryetolagus cunieulus. 



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