68 
William Morton Wheeler 
epinotal spines is feebly and evenly rounded. Epinotal spines very 
large, stout and laterally compressed at their bases and rather rapidly 
tapering to their acute tips ; they are slightly longer than their distance 
apart at the base, directed obliquely backward, outward and upward and 
curved downward towards their tips. Base and declivity of epinotuin 
short and subequal, the former concave. Metasternal angles blunt. 
Petiole from above about l 1 ^ times as long as broad, broader behind 
than in front, without a ventral tooth and with 
a low node, which in profile has a long, straight 
anterior, and a feebly convex, much shorter, 
posterior declivity. Postpetiole short, about 
x / 2 again as broad as the petiole and nearly twice 
as broad as long, transversely elliptical. 
Mandibles coarsely striato-punctate, cheeks 
and middle of clypeus very coarsely reticulate- 
rugose, remainder of head and thorax covered 
uniformly and closely with large circular foveolae 
on a thimble; the petiole and postpetiole with 
similar but more elongate impressions, so that these segments seem to 
be grossly reticulate-rugose. Epinotal spines, gaster, legs and antennal 
scapes smooth. 
Hairs moderately long, erect and sparse on the body; shorter, 
more reclinate and more abundant on the legs, scapes and funiculi. 
Color black. 
Described from two specimens, B 18 605 and one without a 
number, in the Geolog. Inst. Koenigsberg Coli. Both have the body 
much curled and the unnumbered specimen is rather poorly preserved, 
though it shows the pilosity and the sculpture of the mandibles better 
than B 18605. The latter is in an excellent position for the study 
of most of the characters, and is in clear amber. I have redescribed 
the species because Mayr saw only a single specimen which had lost 
both antennal funiculi. He therefore expressed some doubts concer- 
ning its generic position. As Stigmomyrmex has 10-jointed antennae 
and a very different habitus, I have not hesitated to establish a new 
genus for the reception of S. robustus. 
The genus Stiphromyrmex seems to be rather closely related to 
the paleotropical Pristomyrmex , but the workers of this latter genus 
have 11-jointed antennae, the middle and hind femora lack the spurs, 
the mandibles are of a very different shape and the frontal carinae 
are prolonged backward as ridges bordering scrobe-like depressions 
for the antennae. 
Fig. 27. 
Stiphromyrmex robustus 
Mayr. Work er B 18605. 
like the impressions 
