24 
Psyche 
[March 
naked eye. The remaining parts are ferruginous yellow, 
although the gula and both nodes are slightly tinged with 
brownish. The female is colored much like the worker. 
The male of sarasini is like the antennatus male, but 
is smaller and with proportionately narrower gaster; the 
surface of the gaster, while variable, tends to be much 
more smooth and shining; pubescence of gaster much re- 
duced, less even than in antennatus. 
The question arises as to whether the black-and-yellow 
form truly belongs to sarasini , or is a different species; 
this question can be answered only by a more intensive 
study of the distributions of the two types of color pattern. 
It is interesting to speculate that the original Canala con- 
colorous population may have changed, in a period of four 
or five decades, to a bicolorous condition. Rapid changes 
of this type are not unknown in other animal groups (e. g., 
snails of the genus Partula, Crampton, 1917, 1932) that 
occur in insular situations. 
Of the Mt. Mou collections of the concolorous yellow 
form, No. 115 was a small colony in a cavity about 3 cm. 
across under a small rock in wet soil by a stream, altitude 
between 180 and 400 m. The colony had a single queen 
and brood. No. 141 consisted of workers taken foraging 
on the trunks of two trees growing close together in dry 
forest; the collection was made during the first two hours 
of darkness and at a height of from 1-2 m. above the 
ground. The same spot was visited during daylight hours, 
but no further specimens were found. At Le Chapeau 
Gendarme, No. 91 was a nest in a rather dry dead branch, 
about 7 cm. in diameter, lying on the ground amid dry, 
thin leaf litter. This colony was observed for a short time 
in the artificial nest, but during that time it did not feed 
on any of the collembolans or other small arthropods that 
were provided. At this locality, stray workers were also 
taken in leaf litter berlesates. 
At Ciu, No. 251 was a colony of about 30 workers, a 
single dealate female, 3 males, and 20-30 larvae and pupae 
gathered in a small circular cavity about 4 cm. wide in 
thin soil collected between two large rocks on the floor 
of rain forest. No. 289 was a colony taken under a rock 
