56 
Psyche 
[September 
Apterous and resembling the worker in form but differing 
in the following characters : Head more sharply oblong, 
with straight and more clearly parallel sides. Mandibles 
falcate, narrow and tapering at the tips, without distinct 
basal and apical borders, terminating in two small, indis- 
tinct, closely approximated teeth. Clypeus broader and less 
produced than in the worker. Thorax decidedly longer than 
the head plus the mandibles, very low and flat above, the 
pronotum posteriorly nearly as broad as the head, longer 
than broad, with feebly rounded, anteriorly converging 
sides, mesepinotum broader than the head, subtrapezoidal, 
broadest near the anterior end, roundly subtruncate behind. 
Promesonotal suture pronounced, straight and transverse 
in the middle. Petiole regularly oblong, about 1% longer 
than broad, as broad in front as behind. Gaster much 
larger than in the worker, the postpetiole, which forms its 
first segment, nearly twice as broad as long, subtrape- 
zoidal, with straight anterior border. Genitalia similar to 
those of L. revelierei Emery, but the pygidium with entire, 
broadly and semicircularly rounded posterior border, not 
notched in the middle. Hypopygium large, narrowed and 
bluntly bidentate posteriorly. Legs longer and stouter than 
in the worker. 
Described from 24 workers and a single female taken 
Oct. 10, 1931 by Mr. D. C. Swan under a large stone at 
Goyamin Pool, Chittering, Western Australia. 
L. swani seems to be most closely related to L. revelierei , 
but the female of the latter has a much shorter petiole. In 
the long pilosity of the gaster the female of the new form 
resembles theryi, but in this species the petiole is very 
different, being distinctly cordate anteriorly instead of 
oblong. 
Dr. G. C. Wheeler, to whom I sent the larvae of L. swani 
for study, writes me that he found them “extremely inter- 
esting because of their close resemblance to the larvae of 
revelieri subsp. sardoa . They even have the 'tympanum' 
which is difficult to detect unless the specimens are stained. 
This species differs from sardoa in the following charac- 
teristics: (1) The head is sharply constricted just in front 
of the middle so that in dorsal view it is flask-shaped or key- 
hole shaped; the posterior half is circular, the middle half 
