T h e sp e c ie s a r e d i s tr ib u te d a s fo llow s :—
Etbiopiaii
Region.
Austrtiliftu
Region,
Neotropical
Region.
Chelidon . . . .
C otilc..........
Biblis..........
Tachycineta
I’hcdina . . . -
Hirundo . . . .
Cheramoeca ..
Progne . . . .
Atticora .. ..
Petroclielidon
Psalidoprocne
Stelgidoptcryj
3
20
3
3-4
10
10
T h e r e rem a in , th e r e fo r e , h u t t e n sp e c ie s to b e a c c o u n te d fo r , w h ic h c a n n o t be
ta b u la te d a s s tr i c t ly p e c u lia r to a n y o n e o f th e s ix re g io n s . T h ey a r e a s fo llow s :—
1. Chelidon ...................................... 1. C.uj-fnca; 2. C. lagopus.
2. C o tile ................................................. I . e . riparia.
3. B ib lis ................................................. 1. B. rupestris; 2. 71. obsoleta.
■\: H iru n d o ............................................\ . H. nipalensis; 2. / /. rufula ; 3. H. smithii;
-4. H. javanica; o. II. erijthrogastra.
T h u s C h e lid o n zirbica a n d C. la g o p u s a r e P a lte a r c tic a n d In d ia n . C o tile r ip a j'ia is
P a h e a rc tic a n d N e a re tic . B ih l is r u p e s tr is is P a la ia r c tic , E th io p ia n , a n d In d ia n
B . o bsoleta is P a lm a r c tic a n d E th io p ia n . Iliiu in d o n ip a le n s is is P a ltc a r c tic a n d In d ia n
I I . r u fu la is P a ls e a r c tic , E th io p ia n , a n d I n d i a n ; U . s n iilh ii is E th io p ia n a n d In d ia n
[ L J a c a u ic a is A u s tr a lia n a n d I n d i a n ; a n d U . e r y th ro g a s tra is P a ltc a r c tic a n d N e a ic tic .
T h e 1 0 9 sp e c ie s a r c th u s fu lly a c c o u n te d for.
T lie tw e lv e g e n e ra h a v e th e fo llow in g d is tr ib u tio n , fo u r b e in g p e c u lia r to a d is tin c t
r e g io n ;—
Paliearctic Region.
Ethiopian R e g i o n ........................... Two peculiar, viz. Phedina and Psalidoprocne.
Indian Region.
Australian R e g i o n ............................One peculiar, viz. Cherammca.
Nearctic Region.
Neotropical R e g io n ...........................One peculiar, viz. Atticora.
T h e ir r a n g e is sum m a riz e d a s f o llow s :—
I C h e l i d o n ............................................ -• Palajarctie, Ethiopian, and Indian.
2, C o f i l e ................................................. Paliearctic, Ethiopian, Indian, and Ncarctic.
• 3 , B i b l i s ................................................. Palffiarctic, Ethiopian, and Indian.
-4. T a c h ijc in e ta ........................................ Nearctic and Neotropical.
5. P h e d i n a ............................................ Ethiopian.
C. H i r u n d o ............................................ Palaiarctic, Ethiopian, Indian, Australian,
Nearctic, and Neotropical.
7. C h eramoBca ........................................ Australian.
8. P r o g n c .................................................. Nearctic and Neotropical.
9. A t t i c o r a ............................................. Neotropical.
10. Petrochclidon....................................... Ethiopian, Indian, Australian, Nearctic, and
Neotropical.
11. Psalidoprocne....................................... Ethiopian.
12. Stelgidopteryx....................................... Ncarctic and Neotropical.
F rom th e fo r e g o in g T a b le s i t b e c om e s e v id e n t th a t , a s re g a rd s th e Ilirim d iu id f e ,
t h e E tia io p ian R e g io n is th e r i c h e s t in sp e c ie s, w i th -15 p e c u lia r sp e c ie s a n d 2 p e c u lia r
g e n e ra . T h e N e o tro p ic a l R e g io n follows, w ith 25 p e c u lia r sp ec ie s a n d 1 g e n u s . N e x t
in o rd e r is th e In d i a n R e g io n , w i th 10 sp ec ie s, b u t n o g e n u s p e c u lia r to i t s a re a . T h en
th e A u s t r a li a n R e g io n w ith G sp e c ie s a n d 1 g e n u s , fo llow e d b y th e P a ltc a r c tic a n d
N e a r c tic R e g io n s , w ith 7 a n d 6 sp ec ie s re s p e c tiv e ly , b u t n e i tlie r p o s s e s s in g a p e c u lia r
g e n u s .
S ome s l ig h t m o d ific a tio n in th e s e r e s u lt s w ill b e obtaiuocl, i f Cearopis b e co n sid e red
d is tin c t from Ilb 'u n d o , i f I l i r u n d o d im id ia ta b e s e p a ra te d off g e n o r ic a lly , tm d l l y lo -
ch e lid o n b e I'c ck o n ed g c n e ric a lly d i s tin c t fr om B e tr o c h e lid o n , a ll o f w h ic h c h a n g e s a r t'
d is tin c tly fe a sib le [vide antea, p p . x iii, xiv).
I n 1 8 9 3 w e p u b lish e d a p a p e r “ O n t h e Z o o -G o o g ra ifiu c til A r e a s o f th e TVorld,
i l lu s t r a t in g th e D is tr ib u tio n o f B ird s ’’ (N a tu r a l S c ien c e , iii. p p . 1 0 0 -1 0 8 ) , in w h ic h wc
e n d e a v o u re d to sum m a riz e th e su h -d iv is io n s in to w h ic h t h e s ix Z o o lo g ic a l R e g io n s o f th e
G lo b e h a v e from tim e to tim e b e e n p a r titio n e d by zo o lo g ists. IV e th e r e fo r e now
p ro c e e d to d iscu s s th e v a lid ity o f th e s e d iv isio n s fr om t h e s ta n d p o in t o f th e IH ru n d in id oe ,
b u t i t is u n lik e ly th a t a n y s tr ik in g r e s u lts c a n b e o b ta in e d in a fam ily so su s c e p tib le to
m o d ific iitio n o f h a b its a s th e Swallows a re . N o t o n ly a r e th e y m ig r a to ry w ith in lim ite d ,
as w e ll a s la rg e , a r e a s , b u t , a s in th e c a se o f B ro g u e , th e y c a n b e in d u c e d to c h a n g e th e ir
c 2