92 
Psyche 
[June- Sept. 
indicated, for the debris there, but for the Collembola which 
lived about the refuse. Under a large, flat stone in maple 
woods was found a fine colony of S. pergandei in the center 
of a large F. fusca var. subserica Say colony the galleries 
of which surrounded the pergandei nest on all sides and 
below. Workers were observed in the galleries of about 28 
additional nests of Aphsenogaster fulva Roger under stones. 
Four or 5 pergandei workers could often be seen creeping 
away from the superficial galleries when a stone covering one 
of these nests was overturned. One such fulva-pergandei 
association was of special interest because of its similarity 
to the colony in the midst of the F. subserica nest described 
above. The pergandei were nesting in a shallow, nearly 
circular, earthen chamber about 3 cm. in diameter, imme- 
diately under a large, flat stone covering a colony of A. fulva. 
Large, flattened chambers and galleries of the fulva sur- 
rounded the pergandei nest for at least 8 cm. on all sides. 
The walls of the chamber separating the Strumigenys from 
the Aphxnogaster were about % cm. thick. With one ex- 
ception we have always found £. pergandei in the soil, that 
one exception being in the log mentioned below under S. 
dietrichi M. R. Smith. 
Some further notes from observations of this species are 
recorded here. The developmental periods are approxi- 
mately: egg, 15 to 16 days; larval stage, about 42 days; 
pupal stage, about 18 days. On 3 occasions workers were 
seen to bring alternately left and right forelegs to the vertex 
of the head, rubbing the tarsi forward and placing them 
on the ground. Whether this was a cleaning operation or 
a means of transfering some substance to the substratum, or 
has some other significance is not known. The ant did not 
clean the tarsus after rubbing the head, nor did it rub any 
other part of its body. Workers of different colonies fight 
viciously when brought together. On the other hand, a 
colony will adopt the brood of another colony, even of a dif- 
ferent species of the subgenus. 
Strumigenys (Cephaloxys) ornato Mayr 
Two workers were found near the kitchen midden of a 
colony of Aphsenogaster fulva subsp. aquia (Buckley) 
which was nesting under a large stone in a rather moist 
