474 PRIONOPS 
S.r. nigricans: Angola—Humbe and Macongo (Anchieta); 
Belgian Congo—Katanga (Neave). 
S.r. tricolor: Portuguese Hast Africa—Tete (Kirk), Beira, 
Tete and Tambarara (C. Grant); Nyasaland—Zomba and 
Fort Lister (Whyte), Malose, Mkimbi and Angolaland (A. 
Sharpe); German Hast Africa—Dar-es-Salaam, Usambara, 
Ugogo, Mamboio (Kirk). 
S. r. graculinus: German East Africa—Dar-es-Salaam 
(Buxton), Mamboio (Kirk); British Hast Africa—Mombasa 
(Wakefield), Lamu (Jackson). 
Genus IV. PRIONOPS. 
Bill of moderate size, black in the adult, upper mandible hooked and 
notched; nostrils oval without membrane, but completely covered by the 
frontal feathers, which together with those of the front of the crown form 
a crest of bristly, upturned feathers. Eyelids yellow and jagged with a 
series of small wattles. Wing longer than the tail, moderately rounded, the 
secondaries falling short of tip of wing by barely half an inch; primaries, 
3 to 6 longest, 2 reaches just to end of secondaries, 1 nearly half of 3. Tail 
rounded, outer feathers entirely white, the remainder black with white ends. 
Tarsus scutellated all round and orange-red like the feet. Sexes alike both 
in plumage and size. 
Type. 
Prionops, Vieill. Analyse, pp. 41, 70 (1816). . . . . P. plumatus. 
The genus is confined to Tropical and South Africa and comprises ten 
species and subspecies. These are all very similar in size, and differ only 
in the colouring of the head and neck, the amount of crest, and in the 
presence or absence of a white band from the wing-coverts to the ends of 
the three outer secondaries. 
KEY TO THE SPECIES. 
a. A strongly marked white band down the wing from the 
median-coverts to end of secondaries. 
at. No feathers of the crown elongated, upstanding 
frontal feathers greyish : . . . poliocephala. 
b1. Some feathers of crown poner mail elongated, 
forming an occipital crest. 
