700 REPORT OF THE HARVARD AFRICAN EXPEDITION 
on the Duas far up as the Falls and we saw it there also, perhaps half a dozen pairs 
in all between Duport and our first camp at Plantation No. 3, a distance of some 
10 miles, following the windings of the stream. The flight is easy and graceful, 
much like that of a barn swallow, but usually within a few feet of the water, fol- 
lowing the course of the current. At intervals they rest, perching on the project- 
ing stumps of stranded trees in midstream. Thompson (1925), who believes he 
recorded it for the first time from Sierra Leone, notes also that he saw them 
settle on rocks in the water. 
Although Biittikofer says that he found them along all the larger rivers 
visited from Cape Mount to Cape Palmas, we did not notice them on the 
St. Paul’s in the vicinity of Paiata where it is a wide rushing river at high 
water. No doubt, again, the distribution is dependent on just the right com- 
bination of conditions, and it is probable that the mated pairs do not go far, 
each from its chosen site. We failed to see them about the small streams of 
the interior, perhaps because these were too narrow to afford isolation from the 
banks even if dead trees were stranded in them. 
Psalidoprocne obscura (Temminck). Sooty Rough-winged Swallow 
Hirundo obscura Temminck, in Hartlaub, Journ. f. Orn., vol. 3, pp. 355, 360, 1855: Gold Coast. 
A small brownish-black species, the throat grayer; the tail is squarely truncate and in the male 
the barbs of the outer vane of the first primary are bent back. Portuguese Guinea to Togo. 
Although Biuttikofer recorded this species from Sierra Leone, close to the 
Liberian boundary (1892, Notes Leyden Mus., vol. 14, p. 22) on the Sulymah 
River, and Thompson (1925) found it in immense flocks about Freetown in the 
same country on December 12, 1921, and for a few days after, there was no 
actual record of it from Liberian Territory until Lowe secured specimens at 
Nana Kru, January 10, 1911 (Bannerman, 1912). It is not at all rare and we 
saw it several times in small numbers flying about the cut-over area still partly 
flooded along the Du, as well as about the village of Bakratown where a small 
flock of six or eight birds was coursing about over the open compound at midday, 
often reminding one of our Tree Swallows, except that they were silent birds. 
Reichenow records P. chalybea as occurring from Liberia to the Cameroons, 
a bird with steely green reflections and a forked tail, but does not say if speci- 
mens were actually taken in the country. 
CAMPEPHAGIDAE Cuckoo-shrikes 
Campephaga quiscalina Finsch. Steely Cuckoo-shrike 
Campephaga quiscalina Finsch, Ibis, ser. 2, vol. 5, p. 189, 1869: Cape Coast Castle, Fanti. 
Length 8.5 inches; above steely green shading to blue on head; wings and tail black, the 
feathers edged with steely green; base of bill on each side, black; sides of head and entire throat 
purplish violet shading to steel blue on rest of under side. Gold Coast Colony to Liberia. 
This must be a very rare or accidental bird in Liberia. The only record is 
the old one of Biittikofer, of a male taken by Stampfli at Old Field on the Mesu- 
rado River at no great distance therefore from the coast. Another species of the 
