INDEX 



319 



South of England, ^Migration 



Routes into, 215 

 South-west England, weak as- 

 pects of ^Migration to, 215 — 



217 

 South-west Ireland, weak aspects 



of Migration to, 218, 219 

 Species, earliest to arrive in 



autumn, 261 

 Species, highest range of, 114 

 Species not increasing their area 



during winter, proofs of, 195 

 Species, unequal dispersion of, 



reasons for, 191 

 Species, variations in the northern 



limits of, 126, 127 

 Spotted Flycatcher, migrations 



of to Ireland, 219 

 Spring and summer, local move- 

 ment in, 277 

 Spring ^Migrants, arrival of first 



from the south, 246 

 Spring Migration, duration of, 



251, 252 

 Spring Migration in the British 



Islands, commencement of, 243, 



244 



Spring ^ligration. Table indicat- 

 ing the, 254—259 



Spring Migration, the growing 

 intensity of, 249 



Spring, vertical migration in, 252, 



253 

 Sfercorarius catarrhacies, 115 

 Storks, past emigrations of, 98, 



99 



Strix nluco, present emigrations 

 of, 177 



Sturnus vulgaris^ present emi- 

 grations of, 176 



Submergence, effects of on the 

 Emigration and jMigration of 

 birds, 228, 229 



Siila bassana, 112 



Summer ]Migrants, arrival of in 

 British Area, 248, 249 



Surnia doliata^ 89 



SurHtafiitierea^ 89 



Surnia nisoria, 89 



Sus, 57 



Sylvia atricapilla, migrations of, 

 45, 46 _ 



Sylvia cinerea, present emigra- 

 tions of, 172 



Sylvia conspicillata^ 46 



Table of East and North-east 

 Emigrants, analysis of, 133, 134 



Table of Emigrants to Iceland 

 and Greenland, no, in 



Table of Summer ?^Iigrants, 

 analysis of, 149, 150 



Temperature, influence of on 

 birds, 134, 135 



Tern, Common, range of, 128 



Tetrao mlokosicwiczi^ 89 



Tetrao tetrix, 88, 89 



Third cold period of the Glacial 

 Epoch, 62 



Third Glacial Period, physical 

 changes during, 9 



Third Glacial Period, the, 20 



Titmice, races of, 196, 197 



Triiiga areiiaria, 1 1 5 



Tringa catiutits, 1 1 5 



Triitga camitiis^ absence of from 

 Canaries, 99 



Tringa niinuta^ 89 



Tringa 7ninntilla, 89 



Tringa rujicollis, 89 



Tringa snbniimita, 89 



Troglodytes her gen sis, 23 



Troglodytes borealis, 23, 196 



Troglodytes hirtensis, 23 



Trogon, 38 



Tropical islands, endemic birds 

 of, 204 



Tryngites rufescens, 159 



T Urdus alicice, 159 



Turdus inusicus, present emi- 

 grations of, 171 



Turdus viscivorus, present emi- 

 grations of, 170, 171 



Turnstone, migrations of, 212 



Turtur isabellinus, 84 



Unequal dispersion of species, 



reasons for, 191 

 Ursus, 34 

 Ursus arveniensis, Uj 36 



