102 
VOYAGE UP THE TAPAJOS. 
Chap. II. 
making some noise or other, often screwing np its 
mouth and uttering a succession of loud notes resem- 
bhng a whistle. My little pet, when loose, used to run 
after me, supporting itself for some distance on its hind 
legs, without, however, having been taught to do it. 
He offended me greatly one day by killing, in one of 
his jealous fits, another and much choicer pet — the 
nocturnal, owl-faced monkey (Nyctipithecus trivirgatus). 
Some one had given this a fruit, which the other 
coveted, so the two got to quarrelling. The Nycti- 
pithecus fought only with its paws, clawing out and 
hissing like a cat ; the other soon obtained the mastery, 
and before I could interfere, finished his rival by crack- 
ing its skull with his teeth. Upon this I got rid of 
him. 
After a ramble of four or five hours, during which 
Jose shot a beautiful green and black-striped lizard of 
the Iguana family, from the trunk of a tree, and J filled 
my insect box with new and rare species (including an 
extremely beautiful butterfly of the genus Heliconius, 
H. Hennathena), we rejoined our companions at a hut, 
in the middle of the campo, where the Indians lived 
who had charge of the cattle. A tract of land like this, 
several miles in extent, alternating prairie and wood- 
land, would be a rich possession in a better peopled 
country. Tlie few oxen seemed to thrive on the nu- 
tritious grasses, and to make all complete there was a 
little lake in the low grounds, surrounded by fan-leaved 
Carana palms, where the cattle could be watered all the 
year round. The farm was at present new, and the 
men said they had not yet been visited by jaguars. The 
