178 CYPSELIDJE. 



1084. Collocalia francica. The Little Grey-rumped Siviftlet. 



Hirundo francica, Gmel. Syst. Nat. i, pt. ii, p. 1017 (1788). 

 Collocalia francica, G. R. Gray, List Spec. Birds B. M., Fissirostres, 



p. 21 (1848) ; Walden, Ibis, 1874, p. 132 (part.) ; 1876, p. 356 



(part.) ; Hartert, Cat. B. M. xvi, p. 503. 

 Macropteryx spodiopygia, Peale, U.S. Expl. Exped. p. 170, pi. 49 



(1848). 

 Collocalia spodiopygia, Hume, S. F. i, p. 296; ii, pp. 102, 160; iii, 



p. 318 ; id. Cat. no. 103 quat. ; Hume fy Dav. S. F. vi, p. 51 ; 



Oates, B. B. ii, p. 8 ; id. in Hume's N. Sr E. 2nd ed. iii, p. 35. 

 Collocalia inexpectata, Hume, S. F. i, p. 296 ; Hartert, Cat. B. M. 



xvi, p. 505 (C. francicee subsp.). 



Collocalia fuciphaga, apud Blyth, Birds Burm. p. 85 ; nee Thunb. 

 Collocalia merguiensis (C. francicse subsp.}, Hartert, t. c. p. 506. 



Zee-wa-so, Burmese (generic). 



Coloration. Very similar to that of C. innominata, but the size is 

 smaller and the tarsi are naked. The rump-band varies in distinct- 

 ness, being ill-defined and brownish grey in Andaman birds 

 {C. inexpectata), greyish white and well marked in those from 

 Tenasserim (C. merguiensis). The pale rump-feathers are always 

 dark-shafted, those of the lower surface sometimes. 



Bill black ; irides very dark brown ; legs and feet brown (Davison). 



Length 4-75 ; tail 2-1 ; wing 4*7 ; tarsus -4. 



Distribution. Islands of the Pacific and Indian Oceans from 

 Samoa to Mauritius, ranging and breeding throughout the Malay 

 Archipelago to the coasts of Burma (Tenasserim and Arrakan) 

 and the Andaman and Nicobar Islands. 



Habits, fyc. So far as is known, this bird, which produces the 

 best kind of the edible birds' nests of commerce, keeps mainly to 

 the sea-coast. The nests are entirely, as Hume has show ; n, com- 

 posed of inspissated saliva ; they are white except where they are 

 fastened to the rock. The breeding-season in the islands of the 

 Bay of Bengal begins in March. Eggs measure '81 by -53. 



1085. Collocalia linchi. , Horsfield's Swiftlet. 



Collocalia fuciphaga, apud Blyth, J. A. 8. B. xiv, p. 548 ; xv, p. 22 ; 



id. Cat. p. 86 ; Walden, Ibis, 1874, p. 135 ; nee Thunb. 

 Collocalia linchi, Horsf. & M. Cat. i, p. 100 (1854) ; Pelzeln, Novara, 



You. p. 39, pi. ii, fig. 2, pi. vi, fig. 2 ; Ball, J. A. S. B. xli, pt. 2, 



p. 276 ; id. S. F. i, p. 55 ; Hume, S. F. ii, pp. 64, 83, 108, 157 ; 



id. Cat. no. 103 bis ; Blyth $ Wald. Birds Burm. p. 85 ; Hume 



fy Dav. S. F. vi, p. 49 ; Gates, B. B. ii, p. 10 ; id. in Hume's N. $ E. 



2nd ed. iii, p. 33 ; Hartert, Cat. B. M. xvi, p. 508. 

 Collocalia affinis, Tytler, Beavan, Ibis, 1867, p. 318; Blyth, Ibis, 



1868, p. 131 ; Walden, Ibis, 1873, p. 302 ; Hume, S. F. i, p. 296. 



Coloration. Upper parts black, glossed with bluish green or 

 purple, the feathers brown at the base ; sides of head and neck, 

 chin, throat, and upper breast brown ; feathers of remainder of 

 lower parts the same, but with broad white edges, so that the 



