176 BIRDS OF SOUTH AFRICA. 
157. BarsarvLa EXxTONI. Exton’s Yellow-headed Barbet. 
This pretty little species can be at once distinguished from the 
foregoing by its yellow crown. It is a larger form of the ordinary 
Yellow-headed Barbet of Western and North-eastern Africa (B. chry- 
socoma). The southern species was distinguished by the author in the 
‘Ibis’ for 1871 (p. 226), and named after Dr. Exton, who procured 
the typical specimen at Kanye, a native town in the Bechuana country 
(lat. 24° 50’ S. long. 25° 40’ E.), midway between the Marico and 
the Kalahari desert. Another specimen, shot by the late Professor 
Wahlberg, in the Transvaal, is in the editor’s possession. Dr. Exton 
says that the stomachs of the three specimens procured by him 
contained the fruit of a species of mistletoe. 
Upper parts greyish-black, verging to pure black on the head, 
mottled with greenish-white spots, smallest and roundest on the 
back of the head and neck, longer and more elongated on the back ; 
rump greenish-yellow; lesser wing-coverts and primaries on the 
outer-edge bordered with orange-yellow ; tail-feathers narrowly 
edged with dirty-white ; a brilliant orange patch occupies the ante- 
rior portion of the vertex, separated from the bill by a broadish 
black bar, coalescing with the pure black of the head, and succeeded 
by a narrow white bar, which covers the nostrils and passes back- 
ward under the eye ; two short white bars proceed from the edge of 
this suborbital streak, and are divided by black bars from each 
other and from the greenish-yellow of the throat and chin ; eyebrow 
small and white. All the under parts dirty pale ashy, more or less 
tinged with green or greenish yellow. Total length, 4:6 inches; 
wing, 2°7; tail, 1°3; tarsus, 0°6. 
158. BarpBaTuLa BILINEATA. Bridled Barbet. 
Megalaima bilineata, Layard, B. S. Afr. p. 234, 
The present species has never been met with by collectors, since 
it was described by the late Professor Sunderall, in 1850, from 
specimens collected by Wahlberg, in “ Lower Caffraria.” Dr. Reiche- 
now has, indeed, lately recorded it from various localities on the 
West Coast of Africa, but we think the specimens referred to by 
him are B. subsulfwrea, a smaller species and otherwise different. 
The Bridled Barbet may be distinguished by its black back and 
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