the Sobat and Baro Rivers. 591 
Dr. Reichenow recognises LZ. evcubitorius and L. boehini 
as distinct species. Mr. Neumann, on the other hand, 
regards the latter as a subspecies of L. excubitorius and 
separates the birds found from the Hawash Valley south- 
wards to Lake Victoria under the name of L. e. infercedens. 
I quite agree in recognising L. intercedens as a fairly well- 
marked form, but Mr. Neumann also states that it is 
intermediate in size between L. ercubitorius and L. boehmi 
and gives the following measurements :— 
L. e. excubitorius. L. e. intercedens. L. e. boehmi. 
mm. mm. mm, 
Whine: aecec5 105-116 116-124 124-1380 
But after measuring the dimensions of a large series I find 
that L. intercedens (with the wing 105-113 mm.) 1s the 
smallest form; L. excubitorius (with the wing 109-127 mm.) 
is intermediate ; and ZL. boehmi (with the wing 125-127) is 
the largest of the three. It should also be noted that 
typical examples of ZL. evcubitorius from Abyssinia are 
appreciably larger than those from the White Nile and from 
further south. 
40. LANIUS RUFUS. 
Lanius paradovus Brehm; Grant, p.415 ; Butler, p. 328. 
Lanius rufus (Gmel.); Grant, Nov. Zool. ix. p. 465 
(1902). 
Lanius senator Linn.; Reich. i. p. 625 (1903). 
a,b. 3. Moradar, February Ist. 
4]. Lanius IsABELLINUS. 
Lanius isabellinus Hempr. & Ehr.; Grant, p.415; id. Nov. 
Zool. ix. p. 482 (1902); Reich. ii. p. 624 (1903). 
a 9. Renk, 29th January. 
b-e. 6. Lake Tinero, April 2nd & 4th. 
42. LANIUS NUBICUS. 
Lanius nubicus Licht.; Grant, p. 416; id. Nov. Zool. ix. 
p. 464 (1902) ; Reich. i. p. 612 (1903); Butler, p. 328. 
a-d. 8 $ ad.etimm. Renk, January 29th. 
