[March 
6 Psyche 
maxima, except that the mandibles are yellowish, with only 
the teeth blackish. 
Worker minima. (Fig. 1 g-i) Length 2. 8-3. 2 mm. 
Differing from the media in having a still shorter head, 
in the smallest minima scarcely longer than broad including 
the eyes, which are more convex and laterally projecting, 
decidedly reniform and taking up more than 3/4 of the sides 
of the head, so that the cheeks and postocular regions are 
greatly reduced, the latter without distinct corners and with 
slightly and evenly convex median border. Clypeus much 
longer and anteriorly projecting, more convex behind and 
somewhat more concave in front, than in the media. Ocelli 
represented by a pair of very minute pits or completely 
absent. Mandibles more elongate, flattened, with straight 
external borders, the teeth forming a more even crowded 
series, the apical longer than the basal. Frontal carinae very 
short and indistinct. Antennal scapes extending to the pos- 
terior third or fourth of the eyes. Thorax more slender, pro- 
and mesonotum much less convex, with nearly straight out- 
lines in profile, the latter feebly concave as in the media. 
Legs slender, but with the femora distinctly enlarged 
basally. 
Mandibles pale yellow with reddish teeth ; posterior 
orbits not tinged with brown. In other respects like the 
small media. The larger minima is intermediate between 
the small minima and the small media even in the structure 
of the mandibular teeth. 
Described from 15 workers taken by Dr. L. G. K. Kal- 
shoven in a teak-forest at Semarang, Java. The following 
are the lengths of the individual (alcoholic) specimens : 
Maximse : 6.6 mm. ; 5 :7 mm. ; 5.3 mm. ; 5 mm. 
Mediae: 4.5 mm.; 4 mm.; 4 mm.; 4 mm.; 3.8 mm.; 3.8 
mm.; 3.5 mm.; 3.5 m.m. 
Minimae: 3.2 mm.; 3 mm.; 2.8 mm. 
The variations in structure in all the castes are so finely 
graduated that there is no hiatus between the smallest 
specimen measuring 2.8 mm. and the largest measuring 
6.6 mm. 
