122 
Psyche 
[December 
Anus ventral. Spiracles small. Body hairs of the most 
abundant type bifid, and except in Clarkistruma, denti- 
culate. Head hairs few (20-30), except moderately nu- 
merous (52) in Daceton. Labrum small; posterior surface 
spinulose. Mandibles subtriangular in anterior view; with 
one apical and (except in Daceton) two medial teeth; no 
spinules or denticles on the surfaces. Maxillae usually 
without spinules (occasionally a few present). Palp a 
conspicuous protuberance bearing five sensilla (usually two 
encapsulated and three bearing each a spinule), except in 
Strumigenys and Smithistruma. Galea tall and rather 
slender. Anterior surface of labium spinulose; palp re- 
sembling maxillary palp but shorter; an isolated sensillum 
between each palp and the opening of the sericteries; the 
latter a short transverse slit. Hypopharynx spinulose. 
Brown, 19535, p. 467 : “No dacetine was ever observed 
to feed the larvae by regurgitation . . . Food delivered to 
and fed upon by the Australian dacetine larvae consisted 
only of Collembola.” 
Genus Daceton Perty 
Somewhat stout; thorax and first two abdominal somites 
strongly curved ventrally but not forming a neck; diameter 
greatest at abdominal somites iv and v, decreasing grad- 
ually to the anterior end and more abruptly to the posterior 
end, which is round-pointed ; dorsal profile C-shaped, ventral 
J-shaped. Body hairs numerous. Of two types: (1) short, 
nearly straight, with short-bifid tip, each branch recurved 
and bearing short denticles; (2) very few, widely scattered, 
simple, minute. Antennae moderately large; with three 
to five sensilla each. Head hairs short, simple or with 
short-bifid tip. Posterior surface of labrum with 16 sensilla. 
Daceton armigerum (Latreille) 
(PI. 7, figs. 1-14) 
Mature worker larva: Length about 12 mm. Some- 
what stout ; thorax and first two abdominal somites strongly 
curved ventrally but not forming a neck ; diameter greatest 
at abdominal somites iv and v, decreasing gradually to 
the anterior end and more abruptly to the posterior end. 
