274 
Psyche 
[Vol. 90 
Key to Known Myopias Species of Australia, 
Based on Workers 
1 . Small, slender species (H W < 0.75 mm); worker compound eye 
reduced to a single smoothly lenticular dot < 0.05 mm long (in 
Australia, N. Queensland) tenuis 
More robust species (HW > 0.75 mm); worker compound eye 
0.05 or more long, with 3-5 rows of distinct, raised ommatidia 
(Figs. 10, 11) 2 
2. Second gastric segment lower and narrower than the first and 
tapering gently apicad, not constricted at base (N. Queensland) 
densesticta 
Second gastric segment wider than the first and sharply con- 
stricted from its own acrotergite basad 3 
3. Antennae shorter, scapes not overreaching posterior border of 
head when they are held straight back from insertions as head is 
viewed full-face; small funicular segments (funiculus II-VII at 
least) broader than long (Tasmania to SE Queensland) 
tasmaniensis 
Antennae longer, scapes distinctly overreaching posterior 
border in full-face view of head; all antennal segments longer 
than broad, or at least as long as broad 
(S. Queensland: Blackall Range) chapmani 
Myopias ruthae new species 
(Figs. 7, 20) 
Diagnosis, worker: A modest-sized Myopias; head longer than 
broad, with nearly parallel but gently convex sides and weakly con- 
vex posterior border; scapes curved, barely surpassing posterior 
border; funicular club indistinctly 6-merous. Median frontal groove 
deep and wide, reaching to the posterior quarter of head length. 
Median clypeal lobe broad, short, rectangular, widest basad. 
Labrum without a median tubercle. Eyes fairly large, convex, finely 
facetted. Mandibles robust, gently curved, with 4 teeth and a low 
basal angle. Body robust, metanotal groove distinct but weakly 
impressed. Petiolar node massive, subcuboidal; gaster short and 
thick. Sculpture of numerous coarse punctures or foveolae, dense 
and contiguous, or nearly so on most of head and sides of petiolar 
node; foveolae sparser mesad on vertex, trunk and succeeding terga. 
