1954 ] Wheeler and Wheeler — Ba.sicerotini and Dacetini AnL Larvae 141 
0.173 mm). Cranium transversely subelliptical; breadth 
1.5 times length; occipital border feebly concave at the 
middle. Head hairs shorter (0.042.-0.1 mm). Labrum 
twice as broad as long; with four sensilla on the anterior 
surface of each lobe. (Material studied: 10 larvae from 
Malanda, Queensland, 2400', 4-XI-50, W. L. Brown.) 
Genus Smithistruma Brown 
Short and stout; diameter increasing gradually from 
the mesothorax to abdominal somite iv, then decreasing to 
the posterior end, which is broadly rounded; thorax and 
first abdominal somite strongly curved ventrally ; head 
ventral; dorsal profile c-shaped, ventral feebly sinuate. 
Segmentation indistinct. Body hairs moderately numer- 
ous and short to moderately long. Of three types: (1) on 
the ventral surface, few, denticulate, slightly curved; 
(2) bifid, with a few denticles on each branch; (3) anchor- 
tipped, with tortuous shaft, four in a row across the dor- 
sum of each abdominal somite i-iv, i-V or i-vi. Antennae 
small; with two sensilla each. Head hairs short to long, 
flexible and denticulate. Posterior surface of labrum with 
six sensilla. Maxillary palp a low elevation bearing four 
sensilla. Labium with a pair of mammiform ventrolateral 
lobes, each bearing a palp, which is a low elevation with 
four or five sensilla. 
Brown, 1953a, p. 43; “The larvae are whitish in color 
and rest motionless or nearly so in the brood chambers. 
They are well cared for by the workers, which feed them 
at least part of the time by placing them directly on top 
of freshly-killed springtails. In my particular colony of 
S. rostrata, I never once observed regurgitation from work- 
er to larva, but since my colony did not seem very healthy 
or vigorous, I would certainly not say that the larvae are 
never fed by regurgitation in nature.” 
Smithistruma talpa (Weber) 
(PI. 9, figs. 11-18) 
Mature larva: Length about 1.6 mm. Short, stout and 
turgid; diameter increasing gradually from the mesotho- 
rax to abdominal somite iv, then decreasing to the posterior 
end (which is broadly rounded) ; anterior end broadly 
