1918,] the Birds of the Anglo-Egyptian Sudan. 715 



a distinct species and not a race of R. j^cLludicola. Oar 

 Benguella specimens are in every way typical examples of 

 the latter. 



2. RiPARIA P, DUCIS. 



Riparia ducis Reichw. 0. M. 11)08, p. 81 : Ruanda. 



? Riparia paludicola dohertyi Hartert, Bull, B. O, C. xxv. 

 1910, p. 95 : Mau, British E. Africa. 



t Riparia nigricans Madarasz, Ann. Mus. Nat. Hung. 1911, 

 p. 339 : German E. Africa. 



Considerably darker, especially on the back and top of 

 the head, than the last race. Size smaller : wing 95-102, 

 average 98 mm. 



Range. Central and eastern Africa. 



We have no means of knowing whether there is more than 

 one race in these districts, Reichenow^s description of R. ducis 

 not affording much information to workers who are unable 

 to examine his types. 



3. Riparia p. minor. 



Cotyle minor Cabauis, Mus. Hein. i. 1850, p. 49 : N.E. 

 Africa. 



Paler than the last race, very like R. p. paludicola in colour, 

 but the throat and chest paler brown. Size as in last race 

 or slightly larger: wing, average 99 mm. 



Range. Abyssinia and upper Blue Nile. 



We are inclined to regard Cabanis's name as best applied 

 to the Aliyssinian bird, his wing-measurement of 3| German 

 inches ( = 102 mm.) appearing to belong to an Abyssinian 

 bird. 



4. Riparia p. sudanensis. 



Cotile sudanensis Alexander, Bull. B. O. C. xxi. 1908, 

 p. 88 : Lake Chad. 



A paler race than the last and slightly smaller, though 

 there are larger specimens in the collection than those men- 

 tioned by Alexander. Wing 90-98, average 95 mm. 



Range. Lake Chad to the Bahr el Ghazal and White 

 Nile. 



