1978] 
Brown & Boisvert — Ant Genus Pentastruma 
203 
short, slender but stiff, erect hairs. Pronotum with a flat, C-shaped, 
marginate dorsal platform; scutum rising abruptly above this. 
Male: As in Smithistruma. 
Distribution as known: Japan (Honshu and southward); Taiwan. 
Almost certainly occurs on the Asian mainland, but not yet 
collected there. 
Pentastruma sauteri 
Fig. 1 
Pentastruma sauteri Forel, 1912:51, worker. Type loc.: Pilarn, Taiwan. Holotype 
worker: TL 2.2, HL 0.62, HW 0.43, ML 0.06, WL 0.55 rnm; Cl 69, MI 10. 
The figure shows well the full-face outline view of head and 
mandibles. The head is shorter, with vertex more convex, than in P. 
canina, and the mandibles are shorter and more “set into” the 
anterior clypeal concavity. Although we have been unable to view 
the mandibular dentition directly and in detail in the lone holotype 
specimen, it seems that a rounded basal lamella is present, and that 
a series of sharp teeth follows without a diastema. The number of 
teeth (12?) may be slightly smaller than in P. canina, and the sizes of 
the teeth seem to be more evenly graded. 
Viewed from the side, P. sauteri is much as shown in the side view 
of P. canina (Fig. 4), except that in sauteri, the upper vertex is more 
prominent, so that the head is thicker at this point dorsoventrally, 
and the transition from frontal to occipital faces of vertex more 
abrupt. The truncal dorsum is more strongly sinuate in side view; 
the propodeal teeth are also shorter and less acute than in canina, 
and the propodeal lamella wider. The erect pilosity of the gastric 
dorsum and apex is even more reduced, in hair number and size, 
than in canina. In the sauteri type, the middle of the mesopleura is 
weakly shining, though still sculptured, and the dorsolateral mar- 
gins of the trunk are completely lacking. 
P. sauteri still remains known only from this single specimen from 
Taiwan. 
Pentastruma canina new species 
Figs. 2, 3, 4 
Holotype worker: TL 2.9, HL 0.77, HW 0.55, ML 0. 16, WL 0.72, 
petiole L 0.30, eye L 0.05, scape L 0.32, hind femur L 0.46, hind tibia 
L 0.35 mm; Cl 71, MI 21. 
