THE Boa-ConstricTors. art 
much more frequently in the forest distriéts than in the 
open lands. 
The three remaining boas—species of Cora//us—are 
very sharply marked off from the preceding forms, by 
the deep labial pits, which are distinguishable at a glance. 
The most striking of the three is the green tree boa 
(C. caninum) which, as in the case of young anacondas, 
frequents the low bushy growths by the riverside, on 
which, owing to their colour, it is very difficult to dete& 
them. | 
The prevailing green colour of the back is varied by a 
series of white mosaic mottlings arranged transverse to 
the body, giving to the species a very charaé€teristic 
appearance. In young specimens, at any rate, the colour 
seems to be very variable, the green often giving place 
to bright red, the white mosaic being the same. In the 
writer’s experience, no small green specimens have ever 
been met with in the colony, while young red ones are 
fairly common. On the other hand, no large red indi- 
viduals have ever been seen, only the green ones, In 
preserved specimens, in which the tints have been more 
or less lost, the red and green examples are almost in- 
distinguishable; but while the red colour is quickly des- 
troyed and the specimen becomes quite pale, the green 
lasts quite brightly for a very long time, more especially 
in spirits. In life, however, the difference in colour is 
most remarkable. 
Throughout the colony generally this form is often 
confounded with the green labarria, the enlarged anterior 
maxillary teeth being mistaken by the ignorant for poison 
fangs. The struétural differences, however, are very 
great, while the very noticeable white markings along 
