1983] 
Willey & Brown — Genus Myopias 
263 
ences among nest series in the shape of the median clypeal lobe 
(convex vs. straight apical margins), density and size of individual 
foveolae of sculpture, and depth of coloration. 
Queen, dealate, from holotype nest series, Wamuki: TL 8.2, 
HL 1.37, HW 1.50 (Cl 109), ML 0.80 (Ml 58), SL 1.20 (SI 80), 
EL 0.45, WL 2.61. Four additional queens range downwards in size 
slightly from this (Collection Nos. 887 (n = 3) and 990 (n = 1) from 
Busu River, the smallest having HW 1.33. A female from the Wau 
Creek series is ergatoid, but has HW about 1.50; this specimen lacks 
ocelli, but has small, blackened forewing stumps. The queens 
resemble the workers except in the caste difference usual for 
ponerines. 
Male unknown. 
Described from material from four separate nest series, all from 
what is now Papua New Guinea: holotype from Wamuki, 800 m, on 
the Mongi River watershed, Huon Peninsula, 19-20 April 1955 
(Wilson No. 844; MCZ). No. 844, a colony containing one queen 
and about 20 workers, was taken from a Zoraptera-stage rotten log 
in hill rain forest. Two colonies came from the area between the 
lower Busu and Bupu rivers, near Lae, at the base of the Huon 
Peninsula, in lowland rain forest (Wilson Nos. 887 and 990). No. 
887 was a nest in a small Passalus-siSLge log, 28 April 1955, and 
included at least three queens. No. 990 was in a small (10 cm 
diameter) rotten log with interior crumbling, but bark intact. It held 
50-60 workers, two queens, eggs, larvae up to half-grown (no larger 
larvae) and one cocoon. The brood chamber contained an unidenti- 
fied insect larva, also an adult (cucujoid?) beetle that was still alive 
and feebly moving; this beetle could possibly have fallen or walked 
in during excavation of the nest. (Unfortunately, the residues from 
Wilson’s collections were eventually lost.) 
The fourth collection comes from Wau Creek, at about 1200 m 
elevation in a “Stage HI” [rotten] log (leg. D.H., A.C. and A.H. 
Kistner, No. 1213); it contained at least 10 workers and a more or 
less ergatoid queen. 
This very distinct species shows some affinities with the tenuis 
group in the presence of upturned teeth on the labral lobes and lack 
of median labral tooth, but it is different in its robust build, very 
prominent foveolate sculpture, shorter mandibles, and the concave 
anterior face of the first gastric tergum, which gives the name 
concava. 
