BLACIv-BACKED MAGPIE. 
“ Differs from C. t. libicen in being smaller, but much larger than C. t. 
terrceregince. (Bendigo), Victoria.” 
Victoria, South Australia. 
Cracticus tibicen longirostris (Milligan). 
North-west Australia. 
The long bill is comparatively constant, but Hartert’s “ larger size ” should 
be read “ smaller size.” 
In my 1913 “ List ” I reverted to the correct genus name Gymnorhina 
and recognised the four subspecies above indicated. 
I later added 
Gymnorhina tibicen finJci. 
“ Differs from G. t. intermissa in having a larger bill and smaller wing. 
Horseshoe Bend, Eink River, N.T.” 
Central Australia. 
As indicating the trend of the development of splitting it is pleasing to 
record the recent addition by H. L. White of 
Gymnorhina tibicen eylandtensis 
from Groote Eylandt, Northern Territory. 
“ Differs from typical Gymnorhina tibicen by longer bill, more slender 
tarsi, intensely black (glossy black) and purer white parts, narrower band of 
black at tip of tail (30 as against 60 mm.), by the mottled tibia (instead of 
wholly black), and by less black on the tips of white feathers of shoulder 
patches.” The measurements show even a smaller bird than my G. t. terrce- 
regince, as the wing is given as q 224, $ 220, but as immature male reads 232, 
the former measurements cannot be relied upon. These are contrasted with 
Campbell’s measurements of d 257, which is not of the typical form, but of 
the smaller Victorian form. 
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