FISCUS EXCUBITORIUS 265 
Subspecies a. Fiscus princeps. 
Lanius princeps, Cabanis, Mus. Hein. i. p. 73 (1850) Upper Nile. 
Lanius kiek, Vierth. Naumannia, 1852, p. 57, 1857, p. 103, pl. 2 Upper 
White Nile, at 7° N. lat. 
Lanius macrocercus, De Filippi, Rev. et Mag. Zool. 1853, p. 290 Upper 
White Nile. 
Lanius excubitorius (non Prév. et Des Murs), Ogilvie-Grant, Ibis, 
1905, p. 201 Uganda ; Neumann, J. f. O. 1905, p. 227 Ankobo River ; 
Jackson, Ibis, 1906, p. 549 Toro; Ogilvie-Grant, Ibis, 1907, p. 590 
White Nile. 
Fiscus excubitorius, Butler, Ibis, 1905, p. 327, 1908, p. 225, 1909, p. 80 
Bahr el Ghazal; Oates, Cat. B. Eggs, B. M. iv. p. 283, pl. xii. 
fig. 12 (1905). 
Subspecies b. Fiscus bohm. 
Lanius schalowi, Bohm, J. f. O. 1884, p. 177 Bogakatam, Tanganyika. 
Lanius bohmi, Reichen. J. f. O. 1902, p. 258; id. Vog. Afr. ii. p. 616 
(1903), iii. p. 835 (1905). 
Lanius excubitorius béhmi, Reichen. Deutsch. Zentr.-Afr. Hxped. iii. 
p- 314 (1910). 
Lanius intercedens, Ogilvie-Grant, Trans. Zool. Soc. xix. p. 344 (1910) 
Ruwenzori. 
Adult male. Crown, back of the neck, back and tail-coverts pearl grey, 
with sometimes a little white on the rump; a broad biack band covers the 
forehead and sides of the head, and extends down the sides of the neck; 
wings black, with a portion of the scapulars grey (but never white), and a 
broad white base to the primaries; axillaries and under wing-coverts black; tail 
black and white, the centre pair of feathers with the apical two-thirds black ; 
the basal third white, the basal dark portion barred with brown, the outer 
five pairs, with only the apical fourth black, the black on the outer 
pair, averaging 0:5 to 0°75 of an inch; all the tail-feathers, except the 
central pair, with narrow white tips as well; chin, throat, chest, thighs, 
and under tail-coverts pure white. Ivis brown, bill and feet black. Total 
length 11-2 inches, culmen 0:8, wing 4°8, tail 6:3, tarsus 1:2. Duhome, 
3, 25, 2.02 (Degen). 
The female only differs from the male in having a deep chestnut patch on 
the flanks. Wing 4:7. Billin, 9, 21. 1.02 (Degen). 
Fiscus excubitorius princeps.—Birds from the Upper Nile valley differ 
from those from Abyssinia and Shoa in their smaller size; shorter tail and 
the greater amount of black on the tail-feathers, the black tip of the outer 
feather varying from 1:25 to 1:50 against 0:50 to 0°75. Wing 4:35 inches, 
tail 50. Kaka, White Nile, 9, 5.3.01 (Hawker). 
Fiscus excubitorius béhmi.—Birds from Tanganyika and north Nyasa- 
