112 
Psyche 
[June 
preys. At any rate on January 11 one of the cucujids was 
seen trying to pull a bostrychid out of its gallery entrance 
by the declivity of the elytra. 
13. Chrysobothris viridiimpressa C. & G. (det. Fisher). 
One specimen of this buprestid was taken in tanglefoot on 
a living Triplaris early in January. Two or three other 
individuals were seen, all on plants of other species, so the 
occurrence of the beetle on the ant-tree was probably acci- 
dental. 
14. Membracid, sp. A small, simple species with 
spotted wings, of which both adult and immature indi- 
viduals were collected at leaf axils on the Triplaris. The 
tree was inhabited partly by Azteca and partly by Crema- 
togaster. Neither ant seemed to be paying any attention 
to the hoppers, however. 
15. Pseudococcus probrevipes Morrison. These Coccids 
live with both the Pseudomyrma and the Azteca. They 
are usually found in the groove-like channels or pits which 
are mentioned on page 108, but they may occur at the sides 
of entrances or around the nodes, always, of course, inside 
the tree. They are often so crowded into their “houses” 
that, if feeding is possible only on the inner surface of the 
bark, they must take turns at it. 
The broad-leaved Triplaris (Plate 1, upper fig.) is a 
smaller, more compact tree than the narrow-leaved form 
and grows in a different habitat, at the boundary of forest 
and new clearing far from water. It may perhaps be the 
same species modified by unfavorable conditions. The wood 
structure was not examined in detail but seemed to be the 
same as in the narrow-leaved form. The only ant taken 
in the broad-leaved Triplaris was Pseudomyrma triplarina 
symbiotica, but it is comparatively scarce and colonizes only 
a small proportion of the available plants. The following 
insects inhabit the twigs or live on the foliage: 
16. Thyridid, sp. The greenish larvae of this moth were 
found on April 7 in the medullary cavities of Triplaris 
which had not been colonized by ants. The same or a very 
