110 
Psyche 
[June 
rate, this is true of the Pseudomyrma, for two of the Trip- 
lares were banded with tanglefoot and their foliage thus 
isolated on December 17, 1928. One tree was about four 
inches through at the base and twenty feet tall; the other 
about five-eighths of an inch by nine feet. At the time both 
were inhabited by pure Pseudomyrma colonies, which re- 
mained reasonably healthy till the middle of February, 
when the experiment was discontinued. The larger tree, 
however, may have lost a part of its Pseudomyrma popu- 
lation (this point was, of course, very difficult to determine) 
and certainly acquired a small colony of Crematogaster in 
the interval. Only one or two ants were caught in the 
tanglefoot and none was ever seen to attempt to reach the 
ground. The ants do not maintain a cleared area about the 
tree. 
4. Camponotus ( Myrmocladcecus ) bidens Mayr. A few 
specimens of this small, timid ant were taken on a Triplaris 
with Crematogaster in March. C. bidens and its congeners 
are known to nest in hollow, dead twigs of a variety of 
trees. 
5. Tracliysomus thomsoni Auriv. (det. Fisher). This 
big cerambycid beetle fells the living Triplaris by gnawing 
a girdle around the bark and wood of the trunk. It attacks 
trees up to nearly three inches in diameter. The larvae feed 
in the wood of the pruned trunks. Three adults, which 
were bred out, emerged in July and August, but the precise 
time of pruning was not ascertained. 
Trees that have been killed attract a number of wood- 
boring Coleoptera, which are listed below. The order of 
their appearance was determined from a tree which was 
felled with a machete on December 17. 
6. Steirastoma stellio Pasc. (det. Fisher). This is a 
cerambycid which was seen only during the first week after 
felling. Seven specimens were taken, all clinging to the 
lower side of the felled trunk, so the species is probably 
nocturnal. 
7. Odontocera sp. nov. (being described by Fisher). 
This cerambycid, of the tribe Necydalini, appeared during 
