YELLOW-RUMPED TIT. 
Since then only two more forms have been added as follows : — 
Geobasileus dirysorrhous normantoni Mathews 
“ Differs from G. c. dirysorrhous in having a longer bill, and in being more yellow 
underneath and more greenish above. Normanton, Gulf of Carpentaria.” 
Queensland. 
and 
Geobasileus dirysorrhous ferdinandi Mathews. 
From the Musgrave Ranges, 
Central Australia. 
“ Differs from G. c. addendus (Mathews) in being paler above and below and the 
yellow rump more pronounced.” 
I have also renamed Milligan’s form calling it : 
Geobasileus dirysorrhous alexanderi. 
VOL. IX. 
473 
