4 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
disturbed areas (Bosque and Parque), where densities of several per 
100 square meters were probably reached. In the less disturbed and 
more extensive forests they were much less common. Usually a single 
lizard was seen on a tree, occasionally two (a male and female), but 
seldom more. 
Foop.—Insects and other small invertebrates. 
‘TeEMPERATURE.—Probably a nonheliotherm, it was never seen bask- 
ing, but no temperatures were taken. 
IGUANIDAE 
Iguana iguana 
Hapsrrat.—Very few of these large lizards were seen but they are 
reported to be most common along the edges of the rivers. One was 
seen on the edge of a large clearing. It is quite possible that they live in 
the canopy of the forest away from clearings and rivers as well as 
on edges, but they are very difficult to see in such situations. They did 
well in the forested Parque do Museu Goeldi. 
In most forested localities (Panama, Swanson, 1950; Costa Rica, 
Hirth, 1963; British Honduras, Neill and Allen, 1959), iguanas are 
highly arboreal lizards as adults, though one occasionally comes to 
the ground. The juveniles are reported as living closer to the ground. 
Apparently this is true around Belém for local men who hunt them 
say that they live on the branches of trees. Those running loose in the 
Museu Goeldi Parque were seen usually 10-20 meters up in the larger 
trees. 
ABUNDANCE.—We saw them rarely, even when we were examining 
the river margin. Due to hunting they are probably very shy. 
Foopv.—Primarily herbivorous and probably largely eat leaves. 
TEMPERATURE.—A. heliotherm (McGinnis and Brown, 1966). No 
temperatures were taken but iguanas in the Parque do Museu Goeldi 
were seen frequently basking. 
Tropidurus torquatus 
Hasrrat.—F ound only in open areas and along the edges of clear- 
ings, and not in dense second growth or forest. 
These lizards perch above the ground, usually below two meters, on 
tree trunks, logs, rocks, walls, stumps, etc. They seldom climb above 
three meters except when frightened and are very rarely seen in bushes, 
on twigs, leaves, etc. They frequently come to the ground to feed. 
AxsunpDAnce.—This is the most frequently seen lizard in the open and 
probably the most common. Only one adult male is seen per perch but 
sometimes one or two females and several juveniles may be associated 
with him. 
