gg 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 epinotum 

 short and subequal, the former concave. Metasternal angles blunt. 

 Petiole from above about l^/g 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 

 ^/g again as broad as the petiole and nearly twice 

 as broad as long, transversely elliptical. 



Mandibles coarsely striato-punctate, cheeks 

 ^'6- 2'^- and middle of clypeus very coarsely reticulate- 



Stiphromyrmex rohustns remainder of head and thorax covered 



Mayr. Worker B 18605. . ^ ' , ■, , , • . , • -, p 



uniformly and closely with large circular loveolse 



like the impressions 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 Coll. 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. rohustus. 



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 carinas 

 are prolonged backward as ridges bordering scrobe-like depressions 

 for the antennae. 



