1965] 
Taylor — Pristomyrmex 
41 
31 152); one paratype (from Clump Point) in Australian National 
Insect Collection (CSIRO), Canberra. 
2. Pristomyrmex thoracicus new species 
(Figs. 3-6) 
Worker. The following description is based on the holotype and 
14 paratypes collected with it. Dimensions (holotype cited first) : 
HL 0.95, 0.89-0.96 mm; HW 0.95, 0.89-0.99 mm; Cl 100, 98-104; 
SL 0.93, 0.90-0.96 mm; SI 98, 96-101; PW 0.49, 0.45-0.51 mm; 
WL 0.91, 0.87-0.94 mm; Propodeal Spine L 0.30, 0.28-0.32 mm; 
Petiole L 0.34, 0.33-0.36 mm ; Postpetiole Height 0.32, 0.28-0.32 mm. 
General features as in Figures 3 and 4. Similar to P. foveolatus, 
differentiated from it by the following characters: 
1. Relatively narrow head (Cl 98-105 against 106-110 in foveo- 
latus) . 
2. Much longer scapes, which surpass the level of the occipital 
border by 1-1.5 X their maximum thickness when lying in the 
antennal scrobes, with the head viewed in the HL measuring position 
(SI 96-101 against 78-83). 
3. Proportionately much longer mesosoma (WL 0.94-1.00 X 
HW, against 0.84-0.89 X in foveolatus) , which is relatively very 
narrow (PW 0.5 1-0.53 X HW, and 0.50-0.55 X WL against 
0.56-0.62 X and 0.67-0.73 X respectively in foveolatus) . 
4. Eyes relatively slightly smaller; antennal scrobes more distinctly 
outlined. Humeral teeth more erect, failing to project beyond lateral 
pronotal outline when viewed from above. Posterolateral corners of 
pronotal dorsum obtuse, broadly rounded in dorsal view. Propodeal 
spines slightly sinuate, their apices turned upwards; diverging from 
the dorsal midline at angles of about 20 degrees. Metapleural spines 
more acute. Petiolar crest strongly convex in dorsal view, its outline 
almost a half circle. 
5. Sculpturation virtually identical. Cephalic foveae a little more 
spaced ; sides of mesosoma less sculptured, generally smooth and 
shining. 
6. Pilosity similarly distributed, the hairs shorter, especially on the 
crown of the head, and the pronotal dorsum; less abundant on pro- 
podeal dorsum. Hairs of petiole, postpetiole and gaster placed exactly 
as in foveolatus. 
Type-locality. Vision Falls, Lake Eacham National Park, N. 
Queensland. The type nest series was taken from a rotting log in 
rain forest, elevation c. 2500 ft (June 6, 1962; R. W. Taylor acc. 
1399 )- 
