50 
Psyche 
[ March 
Nesolasius subgen. nov. (of Pseudolasius) 
Worker maxima. Resembling Pseudolasius but differing 
in the peculiar conformation of its mandibles, clypeus, 
frontal carinse and eyes. Head large, subcordate, rather 
flat, deeply excised posteriorly. Eyes very small and in- 
distinct, consisting of only a few ommatidia, in front of 
the middle of the head and on its dorsal surface as in Pseu- 
dolasius. Mandibles short, stout and convex, with only four 
very coarse, subequal teeth on the apical border, which is 
not oblique ; the basal tooth apparently consisting of a fused 
pair of teeth. Clypeus very short, with a subrectangular 
median portion not extending back between the frontal 
carinse, anteriorly abbreviated, with broadly concave an- 
terior border, and short, band-like lateral portions ex- 
tending to the sides of the head. Clypeal fossae deep and 
pit-like. Frontal carinse in the form of narrow lobes more 
closely approximated than in Pseudolasius, sens. str. con- 
spicuously elevated, projecting above the surface of the head 
and bearing the antennae beneath their anterior tips, 
bounded laterally by short scrobe-like impressions which 
are very narrowly confluent with the clypeal fossae. Frontal 
area convex, lying between the frontal carinae, continued 
posteriorly as a distinct median ridge instead of a groove 
and extending as far back as the middle of the head. An- 
tennae small, 12-jointed; scapes short. Thorax short and 
stout, shaped much as in Pseudolasius, with large, convex 
pronotum; metanotum distinct, with dorsolateral spiracles. 
Epinotal spiracles elliptical. Petiole, gaster and legs as 
in Pseudolasius. 
Genotype: Pseudolasius ( Nesolasius ) typhlops sp. nov. 
Pseudolasius (Nesolasius) typhlops sp. nov. (Fig. 3) 
Worker maxima. Length 3.3 mm. 
Head about one-fourth longer than broad, as broad in 
front as behind, with feebly and evenly convex sides and 
angularly excised posterior border. Eyes consisting of 
only 3 or 4 scarcely pigmented ommatidia. Clypeus con- 
vex in the middle, depressed on the sides. Antennal scapes 
reaching to the middle of the sides of the head; funicular 
joints 2-10 as long as broad, first joint as long as the three 
