120 
Psyche 
[December 
litt.). The largest genus is Strumigenys with some 200 
species; next is Smithistruma, with about 56 species; the 
other genera are quite small with fewer than ten species 
each. The tribe is essentially tropical but a few genera 
range into the warmer parts of the North Temperate Zone. 
The adults form “an aberrant and sharply distinct group 
belonging to the subfamily Myrmicinae, as is demonstrated 
by the structure of the abdominal pedicel and the male 
genitalia’’ (Brown, 19536, p. 465). They show an extreme 
reduction in the number of antennal segments ; head shape, 
head hairs and mandibles could be characterized as bizarre. 
Their larvae — in contrast — are quite ordinary and far 
less specialized than the larvae of many other ant genera. 
The larvae of the Dacetini are a heterogeneous group 
but not more so than most other tribes of Myrmicinae. 
Daceton is easily separated. Strumigenys and Smithis- 
truma are quite distinct from other genera, although they 
are not distinguishable from each other. The remaining 
genera in our collection, although more similar to each 
other, are still something of a melange. This grouping 
of the larvae confirms somewhat Brown’s recent (19536) 
division of the Dacetini into subtribes: Dacetiti (includ- 
ing Daceton) ; Orectognathiti (including Orectognathus) ; 
Epopostrumiti (including Epoyostruma, Mesostruma, Alis- 
truma and Clarkistruma) ; and Strumigeniti (including 
Strumigenys and Smithistruma). The tribe may be char- 
acterized as follows: — 
Explanation of Plate 7 
Daceton armigerum (Latreille), Figs. 1-14. — 1, head in anterior view, 
X36; 2, left mandible in lateral view, X86; 3, mature larva in side view, 
X8; 4, left mandible in anterior view, X86; 5, head in side view, X36; 
6-8, 10 and 11, bifid-tipped body hairs, X185; 9, simple body hair, X185; 
12, labrum (left half of drawing shows posterior view, right half, anterior 
view), Xl85; 13, very young larva in side view (hairs omitted), X8; 14, 
young larva in side view, X8. 
Epopostruma sp. from Victoria, Figs. 15-19. — 15, left mandible in 
anterior view, X185; 16, head in anterior view, X109; 17, larva in side 
view, X30; 18 and 19, two types of body hairs, X185. 
Epopostruma sp. from South Australia, Fig. 20, left mandible in an- 
terior view, X185. 
