238 Mr. A. L. Butler on the 



142. CoTiLE sHELLEYi Sharpc. 

 a. ?. Khartoum, 6. 11.07. 



Both C. 7'iparia and C. shelleyi are abundant at Khartoum 

 in the winter, and large flocks of either or both species may 

 often be seen hawking over the river or over the crops near 

 it. C. minor, though always present in the winter, is 

 much scarcer. It keeps more exclusively to the river-banks, 

 in which it breeds in the spring, than the other two species, 

 and does not seem to accompany them inland at all. At 

 the margin of the river I have seen all three of these species 

 on the wing together. C. riparia, shot between Meshra and 

 Wau in March, was the only Sand-Martin that I met with in 

 the Bahr-el-Ghazal. 



143. Ptyonoprogne obsoleta (Cab.). 

 a. ? . Erkowit, April 1906. 



This little CliflF-Swallow was common at Suakin in March 

 and April, and also up on Erkowit, where it freely entered the 

 houses. My specimen from Suakin appears to be slightly 

 darker than an Assouan bird and to have a bronze or greenish 

 lustre on the wings instead of a purplish one. The difference 

 is slight, but it struck me that the birds looked a little 

 browner and less grey than Egyptian examples when on the 

 wing. Mr. Grant, however, puts my specimen down as 

 C. obsoleta without comment. 



144. HiRUNDo RUSTicA Linn. 



Frequently seen in the Bahr-el-Ghazal Province in Feb- 

 ruary and March. 



145. HiRUNDO vETHiopicA Blanf. 



I noticed the Abyssinian Swallow frequenting some of the 

 mud-built rest-houses between Meshra and Wau in March 

 and April. 



146. HiRUNDo sMiTHi Lcach. 

 a. (? . Chak Chak, 16. 2. 07. 



I noticed the Wire-tailed Swallow in pairs on the Jur 

 River at Wau, and on the Chell River at Chak Chak, where 

 they were nesting among the rocks in March. 



