600 MR. P. L. SCLATER ON THE [June 27, 
Mr. Swinhoe’s specimens, which I have examined, measure as fol- 
lows :— 
L. t. ale. caudz. 
(1) 6, Amoy, May 1859 ....... 7*5 75 3°3 
(2) 2, Amoy, April 1859 ...... 6°5 70 3°0 
(3) 3, Amoy, May 1859........ 6°5 2 3:1 
(4) ¢, Talien Bay, July 1860.... 7°2 F22 3:2 
I can by no means agree with Radde in considering this species 
merely a variety of C’. apus, although they may both occur together 
in Dauria. 
5. CypsELUS LEUCONYX. 
Cypselus, sp.?, Blyth, J. A. S. B. xi. p. 886. 
C. leuconyx, Blyth, J. A. S. B. xiv. 212; Cat. p. 85; Jerdon, B. 
Ind. i. p. 180. 
Hab. India: Malabar (Jerdon) ; N.W. Himalayas, Simla (Blyth). 
The only examples of this species I have met with are in Mr. 
Gould’s collection. They are not in good condition. They appear 
to be smaller than C. pacificus, and blacker above ; the white bar on 
the rump is narrower, and there is much less white on the throat. 
I admit this species with doubt, and should wish to see further 
examples before deciding definitely as to its validity. 
6. CypsELUS UNICOLOR. 
Cypselus unicolor, Jard. Journ. Nat. & Geogr. Sc. i. p. 242; Jard. 
& Selby, Ill. Orn. ii. pl. 83 ; Vernon Harcourt, P. Z. S. 1851, p. 144; 
Ann. N. H. ser. ii. vol. xv. p.434; A. Newton, Ibis, 1863, pp. 186, 
192. 
Nigro-fuliginosus unicolor : cauda valde furcata: long. tota 6'5, 
ale 5°5, caude rectr. ext. 2°8, med. 1°9. 
Hab. Madeira, permanent resident (Harcourt). 
Mus. Brit. 
“Smaller than C. apus, and tail more deeply forked ; chin some- 
times almost as white as in the Common Swift.”— Harcourt. 
7, CYPSELUS CAFFER. 
Cypselus caffer, Licht. Doubl. p. 58; Cab. Mus. Hein. ii. p. 85; 
Grill, Zool. Ant. p. 41. 
C. pygargus, Temm. Pl. Col. 460. f. 1. 
Niger: gutture et vitta uropygiali albis: pileo et alis murino- 
fuscis: cauda profunde furcata : long. tota 6°2, ale 5°8, caude 
rectr. ext. 2°1, med. 1°8. 
Hab. Nubia (Licht.); Abyssinia (Heuglin) ; Natal (Ayres); Cape 
Colony, generally distributed (Layard) ; Damara-land (Andersson). 
A very distinct species, easily recognizable by its deeply forked 
tail and sharply pointed outer rectrices. Dr. Cabanis informs me 
that Cypselus caffer, Licht. (type), is certainly the same as Cypselus 
pygargus, Temm. Bonaparte (Consp. p. 65) and Radde (Reisen, ii. 
p. 130) have referred Lichtenstein’s name to C. paciicus. 
