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Hypogastrura armata communis (Folsom, 1898) Nov. Comb.
Achorutes communis Folsom, 1898
Ceratophysella communis Stach, 1949
Ceratophysella yuasai Yosii, 1954
Figs. 106-111

The specimen used to prepare these figures came from the Boerner collection BMNH and may be a cotype sent to Boerner by Folsom. C. yuasai Yosii comes from the same locality, Okayama in Japan, as Folsom's material and from Yosii's description and figures I conclude that C. yuasai Yosii is a subjective synonym of Folsom's species. In my "Index" in 1964 p.209 I placed A. communis Folsom as a subspecies of H. armata (Nicolet), and C. yuasai Yosii as a synonym of this subspecies H. armata communis (Folsom). Although I could not detect the sac-like organ between Ants III and IV on the specimen in the BMNH collections, Yosii in his description of C. yuasai states clearly that this organ is present. In accepting this I conclude that the species C. yuasai and A. communis are the same and, therefore, the nomenclatural changes set out above are correct.

Notes: Apex of Ant IV (Fig. 108) with sensory knob in a pit protected by an overlapping thickened cap and a dome-like sensory swelling. Sub-apically Ant IV has 6-7 long curved sense rods and numerous simple setae. Dens with 6-7 stout simple setae along posterior face.