1965] 
T ay lor — Pristomyrmex 
37 
Scutum Width (females only), dorsal view, across the widest part of 
the sclerite. 
WL Weber s length of mesosoma, lateral view; in worker , maximum 
diagonal distance from junction of anterior and dorsal faces of 
pronotum to apex of inferior metapleural lobe; in female, the 
anterior limit of measurement is the point where the pro-mesono- 
tal suture meets the anterodorsal mesosomal profile. 
Pronotal Spine L(ength), as seen in PW measuring position, true 
vertical distance between base of spine on its mesial side, and the 
level of its apex. 
Propodeal Spine L(ength), lateral view, maximum distance from 
apex of spine to opposite edge of propodeal spiracle. 
Petiole L(ength), lateral view, from tip of metapleural spine to 
posterodorsal edge of petiolar tergite. 
Postpetiole Height, lateral view, maximum distance from apex of 
subpostpetiolar process to postpetiolar dorsum. 
Eye Diameter, maximum diameter of eye. 
Ocular Index (Eye Diameter X ioo)/HW. 
Key to the Australian Pristomyrmex Species 
(Based on the workers) 
1. Front of head, between the antennal scrobes, with numerous large 
shallow umbilicate foveae, their average diameter about 0.05-0.06 
mm (group of P. foveolatus) 2 
Area of frons between antennal scrobes entirely smooth, lacking 
sculpturation apart from a few minute, pilosity-bearing punctures 
(group of P. quad rid en tat us ) 3 
2. Scapes barely reaching level of occipital border when at rest 
in the antennal scrobes, with the head held in full-face view 
(fig. 1 ) ; Scape Index 78-83 P. foveolatus n. sp. 
Scapes exceeding level of occipital border by 1-1.5 X their 
maximum thickness when at rest in the antennal scrobes, with the 
head viewed full-face (fig. 3), Scape Index 96-101 
P. thoracicus n. sp. 
3. Head relatively narrow (Cephalic Index 97-103) (fig. 7), either 
concolorous with mesosoma or much lighter in color (plate 3) ; 
pronotal spines, in side view, distinctly longer and stronger than 
those of propodeum (fig. 8) P. quadridentatus (Andre) 
Head relatively much broader (Cephalic Index 110-116) (fig. 
1 1 ) and usually much darker in color than the mesosoma ( plate 
3) ; pronotal spines subequal in size to propodeal ones, or very 
slightly smaller (fig. 12) P. wheel eri n. so. 
