Genus — GE OB AS ILEUS. 
Geobasileus Cabanis, Mus. Hein., 
Vol. I., p. 32 (after Oct. 23) 1851. 
Type (by monotypy) ... ... Saxicola chrysorrhoa Quoy & Gaimard. 
Very small birds with long bills, long wings, long tail and stout legs and feet. 
Compared with Acanthiza this genus consists of larger birds with longer stouter 
bills, longer wings, shorter square tail and shorter stouter legs and stronger feet. 
The bill is almost as long as the head, stout but laterally compressed, the 
basal expansion not so much pronounced, the rictal bristles fewer and the nasal 
bristles obscure ; otherwise the bill is like that of Acanthiza. 
The wing is longer, the first primary is very small and narrow, less than 
half the length of the second, which is less than the eighth and about equal to 
the secondaries : the third, fourth, fifth and sixth are subequal and longest. 
The tail is long and square, but comparatively shorter than that of Acanthiza. 
The legs are comparatively strong, the front of the tarsus booted, the hind 
part bilaminate : the middle toe and claw is a little longer than the hind-toe and 
claw, the outer and inner toes are subequal and inner with claw is about equal 
to the middle toe alone : all the claws are short. 
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