PRIONOPS POLIOCEPHALA 478 
a?. Orest feathers of deep slaty-grey . . . . . . poliolopha. 
b2. Crest feathers white. 
a’. Crest longer, over 1:0, and curved forwards, when 
smoothed down reaching to the black of the 
back ion oer . . pluwmata. 
. Crest shorter, not ac ane povae bios ee 
a Crest feathers straight to their ends . . . martensi. 
b+. Crest-feathers aed inwards at their ends to 
form a sort of ridge. me concinnata, 
6. No strongly marked white band down the wing nat no 
white on the coverts. 
ct. Crown with crest of curved white feathers. 
e?, Chin and throat white ; occipital region pale grey . cristata. 
d®, Chin and throat tinged with smoky-grey ; occipital 
region dark slaty-grey ee | + = = OMOLNSIS: 
d4, Crown without a true crest, though the frontal 
feathers are stiffand upstanding and white in colour. 
e?, Hinder crown and the throat not vinous rufous. 
c’. Larger, wing over4:0) = . «= « . = « . « ‘melamoptera. 
ds. Srialler wing under 4°5 ares . . . wmtermedia. 
f?. Hinder parts of crown and throat vinous s rufous . vinaceigularis. 
Prionops poliocephala. 
Lanius poliocephalus, Stanley in Salt’s Tray. Abyss. p. 50 (1814) Mozam- 
bique. 
Prionops poliocephala, Neumann, J. f. O. 1905, p. 216. 
Prionops talacoma, Smith, Rep. Exp. 1836, p. 45 N. of Latakoo ; id. Il. 
S. Afr. Av. pl. 5 (1838); Sharpe, Cat. B. M. iii. p. 321 (1877) ; 
Shelley, B. Afr. i. No. 666 ae Stark and Sel. Bds. 8. Afr. ii. 
p. 51 (1901); Reichen. Vég. Afr. ii. p. 528 (1903); Sharpe, Handl. 
B. iv. p. 273 -(1903) ; O.-Grant, Ibis, 1905, p. 202 Mulema ; Stoehr 
and Scl. J. S. Afr. Orn. Union, 1906, p. 96 N.-H. Ehodesia ; 
Swynnerton, Ibis, 1907, p. 49, 1908, p. 63 Gazaland; Neave, Man. 
Mem. li. No. 10, p. 70 (1907) N.-H. Rhodesia ; Chubb, Ibis, 1909 
p. 160 Bulawayo; Sheppard, J. S. Afr. Orn. Union, 1909, p. 30 
Beira ; Chubb, t.c. p. 68; Neave, Ibis, 1910, p. 225 Katanga ; Sclater, 
Ibis, 1911, p. 292. 
| Adult. Back, wings and tail black with a green gloss; wing, with a 
great portion of the inner coverts, broad outer edges to three of the 
secondaries and a broad band across the inner webs of the nine long 
primaries white, sometimes all the quills are tipped with white; tail- 
feathers with white ends increasing in size from the centre to the outer one, 
