1983] 
Willey & Brown — Genus Myopias 
255 
essentially reduced to a single convex lens, but at high magnifica- 
tions, traces of an ommatidial grid can be made out; reduction 
approaches the state in M. tenuis, but does not go quite so far. 
Median clypeal lobe trapezoidal, widest near apex (CLL 0. 12, CLW 
0. 16 mm), but by optical illusion may seem as long as or longer than 
wide; free corners rounded; anterior margin straight, convex, or 
even slightly sinuate. Basal oblique mandibular groove (strix) sub- 
lateral in origin, difficult to see in dorsal view, but distinct with its 
ventrolateral extension in side view. Submedian tooth situated in 
seventh tenth of the shaft length, counting from base. Basal angle 
obsolete. 
The upturned tooth on each labral lobe and 3,3 palpal segmenta- 
tion formula are as in tenuis. 
Trunk formed much as in M. tenuis; promesonotum subequal in 
length to propodeum; side view outline rather low and weakly con- 
vex, with a distinctly, but not deeply, impressed metanotal groove; 
propodeal dorsum only feebly convex, and sometimes very feebly 
impressed near midlength. Petiolar node slightly longer than broad, 
about as broad as long, or slightly broader than long, in different 
series (as in M. tenuis also), summit convex, slightly higher behind. 
Caster with first segment strongly rounded above, tergum rising 
caudad; segment II distinctly constricted in front at juncture with its 
acrotergite; about as high at maximum height as segment I, and 
slightly wider. As seen from above, anterior margin of segment I 
straight or feebly convex; shallowly concave in Vanimo worker (and 
queen). Sting long (extruded up to 0.6 mm), sharp, upcurved. 
Sculpture prevailingly smooth and shining; punctures minute and 
widely spaced, more numerous and coarser on head, especially in 
Vanimo worker and queen, and on propodeum, but even here still 
obscure. Pilosity of uneven length, fine, tapered, erect to suberect 
hairs, mostly 0.05 to 0.30 mm long; pubescence decumbent to sub- 
erect, very dilute on anterior dorsum of head, but more abundant on 
antennae and legs, especially extremities. 
Color averaging lighter than in fully pigmented M. tenuis 
workers, light to medium brownish red to dark brownish red, light 
orange brown in some workers, possibly callow. Appendages usu- 
ally lighter, more yellowish, than basic body color. 
Worker variation, as mostly discussed already above, involves 
mainly size-related features and shape of clypeal lobe, distinctness 
