590 Mr. W. R. Ogilvie-Grant on Birds from 
than the birds from the Sobat and Baro Rivers, the wings 
of the two former measuring respectively 4-1 and 4:2 inches, 
while in the latter they vary from 3°6 to 3-9. In other respects 
they do not appear to ditfer. One immature specimen in 
the British Museum from Goz-abu-Gumar, White Nile, has 
some of the feathers of the crown mixed with cinnamon, 
much asin the young of L. barbarus ; this apparently indicates 
a reverting of the present black-headed species to a cinnamon- 
headed ancestral type. Two other immature birds from the 
Baro River have the crown quite black. 
36. Ninaus arer. 
Nilaus afer (Lath.); Grant, p. 414; Reich. ii. p. 539 
(1903) ; Butler, p. 329. 
a. g. Renk, January 29th. 
6. 8. Polkom, March 22nd. 
37. LANrIus assIMILts. 
Lanius assimilis Brehm; Grant, Noy. Zool. ix. p. 459, 
yl. xxvii. fig. 10 (1902); Reich. ii. p. 619 (1903). 
a. g. Khartum, January 11th. 
This example can only be referred to the present form ; 
though apparently adult it differs from the majority of 
specimens in that the narrow black band at the base of the 
culmen is almost entirely wanting. _ 
38. LANIUS EXCUBITORIUS. 
Lanius excubiturius Des Murs; Grant, p. 415; id. Nov. 
Zool. ix. p. 469 (1902); Reich. p. 615 (1908). 
Fiscus excubitorius Butler, p. 327. 
Lanius excubitorius excubitorius Neumann, 1905, p. 227. 
a. g. Moradar, February 1st. 
89, Lanrus INtTERCEDENS Neumann. 
Lanius excubitorius intercedens Neumann, 1905, p. 228. 
a-f. $6 ?. Lake Timero, March 28th to April 7th. 
Finding that the bird procured by M. Zaphiro on the 
White Nile differed slightly from others which he had 
collected on the Baro River, both in colour and in size, I 
have re-examined all the material available for comparison. 
