n a tu r a l m o d e o f n id ific a tio n a n d a d o p t a n a r tif ic ia l o n e— tlio ir in c lin a tio n , tlic re fo re ,
b e in g to fo llow in t h e fo o ts te p s o f c iv iliz a tio n , w h ic h g u a r a n te e s th em p ro te c tio n d u r in g
t h e b re e d in g -s e a so n , a n d e v e n p ro v id e s th em w i th n e s tin g -s ite s .
A. PALA 3A 1 1C T IC R E G IO N .
A h A r c t ic Su b-R e g io n .
Peculiar Genera :—0.
Peculiar Species :—0.
Species which breed within its limits :—1. Chelidon lagopus. 2. CotUe riparia.
Species which are met with within its limits, but are not known to breed :—1. Chelidon urbica.
2. Hirundo rustica.
A^. E u r a s i a n S u b -R e g io n .
a . E u ro p e a n E ro v in c e .
Peculiar Genera :—0.
Peculiar Species :—0.
Species which breed within its limits :— 1. Chelidon urbica. 2. Cotile riparia. 3. Hirundo rustica.
¡3. C e n tr a l S ib e r ia n E ro vh ic e .
Peculiar Genera :—0.
Peculiar Species ;— 1. Chelidon lagopus (virtually replaces C. urbica of the European Province,
though it also breeds ju st within the Arctic Province and elsewhere).
Species which breed within its limits :—1. Chelidon lagnptts. 2. Cotile riparia. 3. Hirundo rustica.
y . E a s t S ib e r ia n P ro v in c e .
Peculiar Genera ;—0.
Peculiar Species :—0.
Species whicli breed within its limits:—1. Chelidon lagopus. 2. Cotile riparia. 3. Hirundo
gutturalis (replacing H. rustica). 4. li. tytleri. 5. //. (only known brecdiugarea
in the Old World).
A^. M a n c h u r ia n S ub-R e g io n .
Peculiar Genera :—0.
Peculiar Species :—1. Chelidon dasypus.
Species which breed within its limits;—!. Chelidon dasypus. 2. C. lagopus. 3, Cotile riparia.
•I. Hirundo gutturalis. 5. H. tytleri. 6. II. dauriea. 7. H. nipalensis.
A-*. M e u i t e r r a n e o -A s i a t i c S u b -R e g io n .
a. M e d ite r ra n e a n P ro v in c e .
Peculiar Genera ;—0.
Peculiar Species:—!. Hirundo savignii.
Species which breed witbiii its limits:—1. Chelidon urbica. 2. Colile riparia. 3. Biblis rupestris.
4. Hirundo rustica. 5. H. savignii. 6 . //. rufula.
S .B .—Biblis rupestris and Hirundo rufula are'cliaracteristic of tliis Province, as far as tlie Western
Palaiarctic Region is concerned.
(3. 3 1 e d ite r ra n c o -P e r s ic P ro v in c e .
Peculiar Genera :—0.
Peculiar Species :—1. Cotile diluta.
Specks which breed within its limits:—!. Chelidon urbica. 2. C. lagopus. 3. Cvtile riparia.
4. C. diluta. 5. Biblis obsoleta. C. Hirundo rustica. 7. If. rufula.
y. M o n g o lia n P ro v in c e .
Peculiar Genera :—0.
Peculiar Species : —0.
Species which breed within its limits:—!. Chelidon urbica. 2. C. lagopus. 3. Cutite riparia.
4. Biblis rupestris. 5. Hirundo gutturalis. 6. / / . dauriea.
A^. I I im a lo-Caucasian Si b -R e g io n .
Peculiar (jcnera :—0.
Peculiar'Species :—0.
Species which breed within its lim its :—!. Chelidon urbica. 2. Biblis rupestris. 3. Hirundo
rustica. 4. H. rufula.
B. E T I I IO B IA N R E G IO N .
B k Sa h ar an Su b-R e g io n .
Peculiar Genera :—0.
Peculiar Species ;—0.
Species which arc known to breed within its limits :—0.
T h is n e g a tiv e re s u lt, h ow e v e r, d o es n o t p ro v e t h a t n o specit!S o f Swallow b rt'e d
within, th e l im its o f th e S a h a r a n S u b -R e g io n , th e fa c t b e in g t h a t wc k n ow l ittlu o r n o th in g
of th e a v ifa u n a o f th i s v a s t a re a . U n d o u b te d ly Sw allow s w ill h e fo u n d n e s tin g w ith in
its b o rd e rs , a lb e it, fo r om’ p re s e n t p u rp o s e s , no s ta tis tic s a r e av a ila b le .