NO. 8658 LIZARDS—RAND AND HUMPHREY 3 
second growth and agricultural situations also were sampled in 
this area. 
The following species were seen frequently enough to provide some 
idea of habitat distribution: Gonatodes humeralis, Iguana iguana, 
Tropidurus torquatus, Plica wmbra, Uranoscodon superciliosa, Poly- 
chrus marmoratus, Anolis punctatus, Anolis fuscoauratus, Cnemido- 
phorus lemniscatus, Ameiva ameiva, Kentropyx calcaratus, Tupi- 
nambis nigropunctatus, Mabuya mabuya. All are diurnal and together 
these species include over 99 percent of all the lizards we saw active 
during the day. 
Two geckos, Hemidactylus mabouia and Thecadactylus rapicaudus, 
the first a common species, are omitted because they are nocturnal. 
Also seen only rarely were Anolis ortoni, Amphisbaena alba, Croco- 
dilurus lacertinus, and several microteiids. 
We must thank Dr. Dalcy Albuquerque, Director of the Museu 
Paraense “Emilio Goeldi,” and Dr. Robert Shope, then Director of 
the Belém Virus Laboratory, for their help during our visits to 
Belém. 
We are much indebted to Dr. P. Humphrey of the University of 
Kansas and Dr. P. Vanzolini of the Departamento de Zoologia, Sao 
Paulo, for their field assistance and encouragement and for arranging 
support for the field work of the junior and senior authors, respec- 
tively. We also wish to thank the directors of the Instituto de Pesquisas 
Experimentacio Agropecuarias do Norte (IPEAN) and the Belém 
Virus Laboratory for their many courtesies and assistance. 
SPHAERODACTYLIDAE 
Gonatodes humeralis 
Hasrrat.—Found only in the forest and in old second growth in 
the “mata de terra firme” and, less commonly, in the “varzea.” They 
were not found in the young second growth or in open areas without 
a closed canopy. 
These geckos perch above the ground on the trunks of small to 
very large trees, on large logs and stumps. They are almost always 
within one and one-half meters of the ground. Rarely were they 
seen on twigs or leaves or in small bushes, but most frequently on 
buttressed trees, trees with loose bark, or many small branches or 
suckers against the trunk that provide complex hiding places, but 
they are not restricted to such trees. They may leave a perch to hide 
in leaves on the ground and sometimes come to the ground to catch 
food. 
Axsunpancy.—This is the most frequently seen lizard in the forest 
and probably the most abundant. It was most common in the somewhat 
