26 
Psyche 
[March 
to the basal ring or groove. Funiculi and tarsi finely and 
densely punctulate, subopaque. Most dorsal surfaces of 
body, including humeral teeth, pronotum and sides of 
head, with a fairly abundant but short, fine and incon- 
spicuous pilosity, mostly arched-subappressed, but becom- 
ing curved-erect on mesonotum. In Figure 4, only the 
pilosity of postpetiole and gaster is depicted; the gastric 
pilosity, in the form of a conspicuous whitish decumbent 
pubescence, is very even, evenly spaced, and quite distinc- 
tive. On legs and antennae, a dilute oblique pilosity be- 
comes shorter and denser as a pubescence apicad. 
Head, alitrunk and both nodes piceous brown (with a 
hint of reddish that may be due to fading), gaster deep 
piceous, nearly black. The general body color appears 
approximately black in life. Mandibles and antennae yel- 
lowish-brown, basal 2/3 of mandibles and middle of scape 
tending more toward light yellowish. Legs brown, with 
conspicuous broad bands of light straw color occupying 
the basal third of each of the six femora and the middle 
third of each of the two anterior tibiae. 
The holotype [mcz] and only known species of 0. 
phyllobates was taken at the edge of the ravine which 
constitutes Joalah National Park, near the top of Tam- 
borine Mt., southeastern Queensland. The ant was taken 
in late afternoon from the foliage of a glossy-leaved 
woody plant, a shrub or young tree, about three feet 
above the ground. The plant was growing in a very small 
opening in rain forest, the result of the falling of a medium- 
sized tree from the canopy. Intensive search was made of 
the ground cover near the plant, but no indication of the 
nest could be found. 
0. phyllobates is most closely related to (0. nigriventris ) , 
but is easily distinguished by means of its broader post- 
petiole, by its smooth, shining, afoveolate sculpture, by 
its darker color, by its slightly stronger gastric pube- 
scence, its more concave inner mandibular borders, and 
other minor details. O. sexspinosus Forel is lighter in 
color and is generally more slender, with much longer 
teeth or spines on the alitrunk, and it has no teeth on the 
petiolar node. 
