DRYOSCOPUS 337 
Genus II. DRYOSCOPUS. 
Resembling in most respects Laniarius, but the rump feathers white or 
grey, and contrasting with the black or blackish mantle; wing rounded, the 
fourth to seventh primaries the longest; tail rounded, generally a little 
shorter than the wing; plumage black and white with some sandy buff but 
no bright colours ; feathers of the rump very well developed and expansile 
into a powder-puff-like erection, especially in the males ; rump never spotted 
as in Laniarius. Sexes generally very distinct, and specific differentiation 
carried to a much greater extent in the female than in the male sex. 
Type. 
Dryoscopus, Boie, Isis, 1826, p. 973. . . ~ « Di cubla: 
Hapalophus, G. R. Gray, Charlesw. Mag. N. H,, 1837, 5 489. D. cubla. 
This genus contains thirteen distinguishable Aue and is confined to 
Tropical and South Africa. Dryoscopus atrialatus (Cassin, Pr. Phil. Acad., 
1851, p. 246) appears to be synonymous with Megabias flammulatus, and 
is placed among the Muscicapide. 
KKY TO THE SPECIES. 
a. No white frontal band extending back to over the ear- 
coverts. 
at, Crown mantle wings and tail black, the wings less 
glossy. 
a2. No white spots on the lores. 
a’. No white on the scapulars and wings . . . . senegalensis 3. 
b8. Scapulars mixed with white, but none on the 
covertsorsecondaries. . . . affinis 3. 
cS’. Wing-coverts and secondaries Gdged! ite me 
or whitish, as well as white on the scapulars. 
a*. Har-coyerts not streaked with white. 
a>. Rather larger, wing about 3:5 ; puff-feathers\ ea 
of the rump white tipped with grey ; edging} ae Se 
of coverts and secondaries dirty white. EON |S 
b>. Rather smaller, wing about 3:2; puff- 
feathers pure white ; edging of coverts and 
secondaries pure white : 
c>. Smaller still, wing under 3-0; edema of 
secondaries very broad and dusky white. . pringli 3. 
b+. Har coverts streaked with white . . thamnophilus. 
b?. A distinct white spot on the lores, extending to 
but not beyond the eye. 
d’. No white on the wings and scapulars . - . . senegalensis?. 
cubla 3. 
hamatus 3. 
