444 EUROCEPHALUS 
monotonous solitude. It has a very clear plaintive call-note ; 
but generally its notes are querulous, and at times not unlike 
the distant call of a corncrake.” 
Fleck (J. f. O. 1894, p. 402), who met with this species at 
Rehoboth in October and December, found caterpillars and 
other insects in the stomachs examined. He syllables its 
ringing note as “ Tchak-tchak-tchak,” and gives a figure of it 
in black and white. The British Museum contains examples 
of this species from Otjimbinque in German South-west Africa 
(Andersson), and from Humbe and Biballa in southern Angola 
(Anchieta). 
Family VY. PRIONOPIDA. 
Bill Shrike-like, more or less strongly notched and hooked ; resembling in 
general form and characters the Lanide, but with the postero-lateral aspect 
of the tarsus covered with a series of scutes like the anterior aspect, instead 
of by two long undivided lamin as in the Lande. 
KEY TO THE GENERA. 
a. Eyelids and feathers of the head normal ; bill black. 
at. Crown white; first primary as long as the 
secondaries; rictal-bristles strong. . Eurocephalus. 
61. Crown black; first primary much pronto than the 
second; rictal-bristles rudimentary . . . Nilaus. 
b. With fleshy wattles round the eye; head more or jets 
crested. 
ct. Bill blackish, visible portion of the culmen about 
equal to the diameter of theeye . . Prionops. 
d+. Bill red or orange; visible portion of the paler at 
least twice the diameter of theeye . . . . . Sigmodus. 
Genus I BUROCHPHALUS. 
Bill black; culmen very evenly curved from beyond the frontal feathers, 
which are stiff and forwardly directed over the basal third of the culmen 
and entirely cover the nostrils; upper mandible extending considerably 
beyond the lower mandible and yery slightly notched; rictal-bristles 
