XX GEOGEAPHICAL DISTEIBUTION. 



natural mode of nidification and adopt an artificial one — their inclination, therefore, 

 being to follow in the footsteps of civilization, which guarantees them protection during 

 the breeding-season, and even provides them with nesting-sites. 



A. PALiE ARCTIC REGION. 



Ai. Arctic Sub-Region. 



Peculiar Genera: — 0. 



Peculiar Species : — 0. 



Species which breed within its limits : — 1. Chelidon lagopus. 2. Coti/e riparia. 



Species which are met with within its limits, but arc not known to breed : — 1. Chelidon wbica. 

 2. Hirundo rustica. 



A-. Eurasian Sub-Region. 



a. European Province. 

 Peculiar Genera: — 0. 

 Peculiar Species : — 0. 

 Species which breed within its limits : — 1. Chelidon urbica. 2. Coti/e riparia. 3. Hirundo rustica. 



j3. Central Siberian Province. 



Peculiar Genera : — 0. 



Peculiar Species : — 1. Chelidon lagopus (virtually replaces C. urbica of the European Province, 

 though it also breeds just within the Arctic Province and elsewhere). 



Species which breed withni its limits : — 1. Chelidon lagopus. 2. Cotile riparia. 3. Hirundo rustica. 



J. East Siberian Province. 



Peculiar Genera : — 0. 



Peculiar Species : — 0. 



Species which breed withiu its limits: — 1. Chelidon lagopus. 2. Cotile riparia. '6. Hirundo 

 gutturalis (replacing H. rustica). 4. H. tytleri. 5. H. erythrogastra (only known breeding- 

 area in the Old World). 



A^. Manchurian Sub-Region. 



Peculiar Genera : — 0. 



Peculiar Species : — 1 . Chelidon dasypus. 



Species which breed within its limits:^!. Chelidon dasypus. 2. C. lagopus. 3. Cotile riparia. 

 4. Hirundo gutturalis. 5. H. tytleri. 6. H. daurica. 7 . H. nipalensis. 



