x iv INTRODUCTION.
G e n u s 10. P E T B O C H E L ID O N .
N e s t. B o ttle - sh a p e d .
E g g s . W h i t e , s p o tte d w i th r u f o u s o r b row n.
Two sp e c ie s a ffo rd a n e x c e p tio n . P . n ig r ic a n s is a p p a r e n tly a t r u e F e tr o c h e lid o n in
t e rm a n d s ty le o f c o l o u r ; b u t i t b re e d s in b o le s o f tre e s , a n d m a k e s a n e s t o f s traw a n d
f e a th e r s . I t w ill p ro b a b ly bo n e c e s s a ry to s e p a r a te th e s e T re e -b u ild in g Swallows fi-om
th e C liff-b u ild in g sp ec ie s, so a s to in c lu d e th e tw o sp e c ie s in H ijlo c lie lid o n , viz.,
I I . n ig r ic a m a n d U . fim o r ie n s is.
S u b fam ily I I . F S A L ID O P I IO O N I N J E .
G e n u s 11. P S A L ID O P B O C S E .
T h e s e llo u g li-w iiig e d Sw allow s o f A f ric a a r e v e r y C y p s e lin e in t lic ir a p p e a ra n c e a n d
w a y s , a n d la y tw o w h ite eg g s . H r . J a c k s o n fo u n d P . o r ie n ta lis b r e e d in g in a cave,
s om ew h a t a f te r th e m a n n e r o f a CoUocalia. P . p r is to p tc r a b re e d s in h o le s iu th e sid es
of ra v in e s .
G e n u s 12. S T E L G IB O P T E l lY X .
T h e A m e r ic a n B o u g h -w in g e d Swallows, o n th e o th e r h a n d , b u ild in b o le s o f b a n k s ,
lik e S a n d - l l a r tin s , a n d , lik e th e l a t t e r , la y se v e ra l w h ite eggs.
G EO G l lA P I l lC A L DISTRIBUTION.
W e h a v e e n d e a v o u re d i n th e p r e s e n t w o rk , by. m e a n s o f t h e i l a p s a n d ^
Ge em-aphioal D is tr ib u tio n , to i l lu s t r a t e in a c o n c ise m a n n e r th e r a n g e o f th e Swallow
a t th e p r e s e n t d ay . S h o u ld th e r e s u lt s a p p e a r in c om p le te to a n y O rm th o o g ^
s tu d e n t, w e c a n o n ly r e c om m e n d h im to m a k e a s im ila r e ssa y , a n d b e w d l sp e e d ily fin d
Hew in tr i c a t e a n d h ow d iffic u lt o f d em o n s tra tio n is th i s b r a n c h o f O rm th o lo g ie a l Seimme
I t w ill b e im p o ss ib le to o b ta in d e f lu ite r e s u lt s u n t i l th e h a b its a n d m ig ra tio n s o f r e r y
sp ec ie s a r c s tu d ie d in e v e ry c o u n try b y c om p e te n t o b s e rv e rs , a n d th i s is fa r from b e in g
th e case w ith t h e Swallows. , . .1 ^ n •
T a k in g f ir s t t h e tw o p r in c ip a l d iv isio n s o f t h e W o r ld , w e o b ta in th e fo llow in g
re s u lts
G e n e ra p e c u lia r to th e Old WO i'ld {Palmogcea).
1. Chelidon.
2. Bihlis.
3. Phedina.
T. Cherammca.
a. Psalidopvocne.
G e n e ra p e c u lia r to th e N ew W o r ld (Neogcea)-
1. Tachycineta.
2. Progne.
3. Atticora.
•I. Stelgidoptcrys.
G e n e ra fo u n d h i hath E a s te rn , a n d W e s te rn E em is p h e r e s .
1. Cotile.
2. IIirundo.
3. Petrochclidon.
T h u s th e tw e lv e g e n e ra o f th e n iru n d in id f f i a r e a c c o u n te d for.