Brown, W. L., 1975, Contributions toward a reclassification of the Formicidae. V. Ponerinae, tribes Platythyreini, Cerapachyini, Cylindromyrmecini, Acanthostichini, and Aenictogitini., Search: Agriculture; Cornell University Agricultural Experiment Station 15, pp. 1-115: 11

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Probolomyrmex  HNS 

> Probolomyrmex  HNS  Mayr, 1901: 2 - 3, [[ worker ]]. Type: Probolomyrmex filiformis Mayr  HNS  , 1901, monobasic. Taylor, 1965: 345 - 365, revision.

> Escherichia Forel, 1910: 245, [[ worker ]]. Type: Escherichia brevirostris Forel  HNS  , 1910, monobasic. Syn. Taylor, 1965: 346.

This genus was well and comprehensively revised by Taylor in 1965, and I find no reason to cover the same ground. Since his revision, however, 2 new species, P. bidens  HNS  and P. procne  HNS  [19, 20], have come to light, and the status of some old ones [21] require discussion, so that a revised species list and a few comments and records are offered here.

In his generic diagnosis, Taylor characterizes the workerqueen sting as " well developed, " which scarcely does justice to the powerful structure as seen fully or nearly fully extruded in the syntype of P. dammermani  HNS  (MCZ) reviewed by him. In this specimen, the extruded sting shaft is 0.52 mm long, with a thick base, as compared to a total gastric length of only 1.13 mm. A worker specimen of P. dammermani  HNS  was dissected, and proved to be without the stridulatory file on the pretergite of gastric segment II, a condition I believe holds throughout the genus because of the " tight " fit of the second segment into the first gastric segment of all 9 species I examined externally for this character. The modest constriction between the first and second segments is seen clearly in side view, but is not usually apparent in dorsal view. The second gastric segment is not " fused " into a tube, as Taylor indicates; instead, the tergum and sternum separated easily and cleanly along lateral sutures, with only slight tension in a P. dammermani  HNS  worker treated with KOH.

The characters distinguishing Probolomyrmex  HNS  from Platythyrea  HNS  are cited in comparative form on p. 7.