106 NILS GYLDENSTOLPE, ZOOI.OGICAL RESULTS OF THE SWED1SH ZOOLOGICAL EXPEDITIONS TO SIAM. 



A nest of this fine species was found 011 the llth of March 1914 at the neighbourhood 

 of Pak Koh. It was placed in an open hole of a decayed tree and contained two café-au- 

 lait coloured eggs. There was not the slightest trace of a nest and only a few pieces 

 of wood coiistituted the bottom. 



Measurements of eggs: nfx ' w nf J 



ö& 20,5 x 20,5 mm. 



Fam. Cypselidse. 



203. Chaetura sp. 



During my stay at a small river called Hue San Noi about one day's march south 

 of Chieng Hai, I observed some specimens of a Chcetura (probably Choetura giganten in- 

 dica Hume which I previously found in similar conditions in Northern Siarn) flying up 

 and down the small river just before dusk. 



Some other specimens were also observed at the neighbourhood of Pak Koh on the 

 I8th of March 1914. 



204. Collocalia francica germaini. Oust. The Little Grey-rumped Swiftlet. 



<$ Koh Lak u / 13 1914. L = 125 mm.; W = 110 mm.; T = 55 mm.; C = 4,5 mm. — $ Koh Lak 

 l7 /i2 1914. L = 115 mm,; W = 119 mm.; T = 54,5 mm.; C = 4 mm. — Iris: black. Bill: black. Legs: 

 brown. 



Both the specimens of Collocalia I obtained near Koh Lak in the Siamese Malaya 

 ought to be referred to the race described by Oustalet (Bull. Soc. Philom. France, 1876) 

 under the name of Collocalia germaini. One of my specimens ( J 1 ) is, however, practicallv 

 intermediate between this race and C. francica inexpectata Hume from the Andaman 

 Islands. This male specimen has the upper surface of the body decidedly darker and the 

 rumpband is of a smoky brown colour; the black shaft-stripes of the rump-feathers are, 

 however, very conspicuous, hence declining to C. francica germaini. 



In the general appearance this race is very similar to C. f. terroereginai Ramsay, 

 from Australia, but is distinguished by greater size and by having darker upper parts. 



Oberholser in bis »Monograph of the Genus Collocalia» (Proc. Acad. Nat. Science. 

 Philadelphia, Vol. 58, 1906, p. 198) gives the wing in C. francica terrceregince as measuring 

 110 — 111 mm. and Stresemann (Novitates Zoologien, Vol. 19, 1912, p. 351) records 

 the wing as 111 — 116 mm. 



Two specimens (cfJ 1 ) of C. francica terrcereginoe from Queensland in the collections 

 of the R. Nat. Hist. Mus. in Stockholm have the wings measuring 115 — 117 mm.; tail — 

 65- — 59 mm. and the tarsus 10 — 9,5 mm. 



At the neighbourhood of Koh Lak these Swiftlets were rather common from No- 

 vember to the end of January and mixed up together with Apus affinis mbfurcatus 

 Blytii., though always rather difficult to obtain on aecount of their flying at a 

 considerable height. 



