No. 3658 LIZARDS—RAND AND HUMPHREY 5 
Foopv.—Insects and other invertebrates. 
Trmrrrature.—A heliotherm (fig. 2). It frequently basks and shows 
difference in posture related to substrate temperatures. (For more 
detailed data on this species, see Rand and Rand, 1966.) 
Plica umbra 
Hasrrat.—F ound only in the forest and older second growth. These 
lizards occur in the “mata de terra firme” and, at least occasionally, in 
the “varzea” and are not found in the open or on isolated trees. 
Individuals of Plica umbra were seen on the trunks and branches of 
moderate to large trees from close to the ground up to at least several 
meters. None were seen in bushes or on twigs. 
Foop.—Insects and other invertebrates. 
Anunpancn.—Moderately common. Seldom were two seen on the 
same perch, but several times a male and a female were found only a 
few meters apart, more frequently than we would have expected by 
chance alone. Perhaps some sort of pair bond is formed. 
Temprraturn.—A nonheliotherm (fig. 2). No basking behavior was 
seen. 
Uranoscodon superciliosa 
Hasrrat.—Found only along the shaded margins of streams and 
lakes where the forest interior comes to the edge of the water in both 
“mata de terra firme” and “varzea.” 
Individuals were seen up to two meters high on moderate to large 
diameter tree trunks and on logs at the edge or in the water, some of 
which the lizards could have reached only by swimming. They fre- 
quently jumped into the water when approached and sometimes dove 
to the bottom and hid. 
ABUNDANCE.—This species is moderately common in its habitat. No 
more than one individual was seen on a perch. 
Foop.—Insects and other invertebrates. 
Trmprerature.—A nonheliotherm (fig. 2). No basking behavior was 
seen. 
Polychrus marmoratus 
Hasrrat.—An animal collector for the Belém Virus Laboratory took 
large numbers in second growth along the edges of forest. Our few 
specimens were found in similar places. It is likely that this species also 
occurs in the crown of the forest, as Rand has seen it in such habitats 
in Trinidad. 
Polychrus can and does climb easily on small twigs and branches. 
ABUNDANCE.—Though we saw few individuals, many were taken 
in the area by the Virus Laboratory collector. 
