WHITE-BROWED WOOD-SWALLOW. 
exactly as suggested by Gould, personatus in the west and superciliosus 
to the east alone, the former is the more abundant in the west while 
the latter is generally, but not always, more numerous in the eastern part 
of the continent. Thus Rogers has reported a few superciliosus from 
North-west Australia among thousands of personatus, as already recorded in 
connection with the previous species, and again Hall has written that 
Rogers stated : “ In Derby (20/7/02) A. personatus was to be seen in 
thousands, while A. superciliosus was not numerous. A few of the males 
of the latter species were among flocks of the former species. Both species 
had left Derby 23/9/02.” 
Then Whitlock, on the East Murchison bird fauna, commented : “A. 
superciliosus is not very well known as a visitor to this State. In the early 
part of August many Wood-Swallows were migrating to the west and north- 
west, and a flock of over a thousand birds became weather-bound, heavy gales 
with rain setting in from the south-west. These were mostly Artamus 
personatus, but amongst them I detected several darker individuals of a 
more robust build. I managed to shoot one or two of either sex. They 
proved to be of the present species.” 
As most writers commenting on the intermingling of the species observe 
the lack of interbreeding, the authentic cases recorded by North need re- 
quoting : “ Mr. North remarked that in the first edition of Nests and Eggs 
of Australian Birds (p. 44, 1889), [i.e., Austr. Mus. Cat., No. 12, not Campbell’s 
better known work with the same title] he had recorded that the late Mr. 
George Barnard, of Coomooboolaroo, Duaringa, Queensland, had on one 
occasion found the adult male of Artamus superciliosus paired with the 
adult female of A. personatus. Mr. North then exhibited a specimen of 
unusual interest, a hybrid adult male, Artamus superciliosus xA. personatus, 
obtained by Mr. H. Greensill Barnard of Bimbi, Duaringa, Queensland, on 
the 9th September, 1908. Also, for comparison, adult males of A. superciliosus 
and A. personatus. Mr. Barnard came across a flock of A. superciliosus resting 
about five miles away from home, and among them was the hybrid, which 
was mated with a female of A. superciliosus, engaged in building a nest. 
It resembles A. superciliosus on the upper-parts, has the forehead, lores, 
cheeks, ear-coverts, and throat black, passing into blackish-grey on the fore- 
neck ; remainder of under-surface ashy-grey with a slight vinous wash ; 
under tail-coverts pale ashy-grey ; over and behind the eye a distinct white 
eyebrow, but not extending so far on to the sides of the crown of the head, 
as in A. superciliosus. Total length 7, wing 4*85 inches.” 
It is probable that other cases occur among the thousands, but few have 
carefully looked for such instances. 
VOL. X. 
241 
