90 A COLLECTION OF BIRDS FROM X. E. SUMATRA. 



2 $ , $ imm., Polonia, Deli, X. E. Sumatra, 24th October 



1916— 5th February 1917 [Xos. 642, 718, 820]. 



Wing, $ , 205, 194, 177 (imm.) mm. 



It is evident that these specimens belong to the race for 

 which on insufficient grounds Mr. Oberholser has revived the 

 name C. bimaculatus, Peale, which despite his arguments we 

 now believe to have come from Singapore as originally stated. 

 The size of these specimens shows that the character of size 

 relied on to separa'te the races is not sufficient and that, as 

 occurs in hundreds of other instances, we have here a case of 

 a species regularly diminishing in size from north to south. 

 If the two races are maintained we think that the southern 

 will have to be called C. m. bimaculatus of which C. m. ana- 

 mesus will become a pure synonym. 



CYPSELIDAE. 



62. Collocalia innominata, Hume. 



$ , Polonia, Deli, X. E. Sumatra, 4th August 1916 [Xo. 



818]. 

 $ , Wing, 128 mm. 



Xot separable from specimens from the coasts and moun- 

 tains of the Malay Peninsula. 



63. Collocalia linchi cyanoptila, Oberholser. 



Proc. Acad. Xat. Sci. Philad. LYIII, p. 205. 



3 $ , ? Toentoengan, Deli, X. E. Sumatra, 9th — 11th 



February 1918 [Xos. 983-5, 989]. 



Wing, $ , 98, 98, 97 mm. ? 99. 



Except that they are a little smaller, these birds exactly 

 agree with specimens from the Malay Peninsula. In size they 

 would appear to agree with C. I. affinis, Beavan, from the 

 Andamans and Xicobars but differ slightly in colour. 



64. Hemiprocne longipennis harterti, Stresemann. 



Eobinson and Kloss, p. 132. 



Macropteryae longipennis, Hartert, p. 205. 



2 S , 2 , Polonia, Deli, X. E. Sumatra, 4th August— 21st 



October 1916 [Xos. 706, 755, 763]. 

 Wing, $ , 172, 168; $, 163 mm. 



Common in Sumatra as in the Malay Peninsula but hard 

 to secure. 



65. Hemiprocne comata(Temm.). 



Macropteryx longipennis, Hartert, p. 205. 

 6 , Deli Toewa, Deli, X. E. Sumatra, 28th April 1917 



[Xo. 331]. 

 Wing, S , 124 mm. 



Jour. Straits Branrb 



