( Delma fraseri) superficially resembles the young of the Brown 
Snake, and is known as the Mimicking Snake-lizard. Other 
Snake-lizards which occur fairly commonly are the Scaly-foot 
( Pygopus lepidopus), the Pretty Snake-lizard ( Aprasia 
pulchella ), and, lastly, the commonest member of the family in 
South Australia, the Spinifex-lizard ( Pseudodelma impar). 
The Agamas or “Dragons,” unlike those previously men- 
tioned, are not of a retiring disposition, although some of them 
are not generally observed owing to their habit of remaining 
motionless for long periods. The Jew-lizard or Bearded-lizard 
( Amphibolurus barbatus) is by far the largest and most often 
seen species. When alarmed it assumes a threatening attitude, 
with mouth wide open and exposing the bright colour inside, 
while a prickly frill around the throat is distended to the utmost, 
and by deep inspirations the body assumes an almost circular 
form. A far commoner species is the Tree-dragon (A. 
muricatus ) , a quite harmless little lizard, which, for some obscure 
reason, is popularly known as a “Blood-sucker”; though some- 
times found on the ground, it is more often seen on trees and 
Fig. 24. — The Tree dragon (Amphibolurus muricatus) (After C. Barrett). 
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