Key to Notoncus Species
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- Scutellum enlarged and projecting dorsally as a rounded or oval process, or as an erect scale or tooth, from the region between the mesonotum and propodeum; humeri strongly developed and angulate => 2
- Scutcllum absent, or at best not sharply differentiated and not forming any kind of prominent process projecting dorsad (in some workers of N.hickmani, the metanotal spiracles may be connected by a low ridge); humeri rounded, not projecting to any marked extent => 3
- Scutellum in the form of a slender, erect process, the apex of which may be in the form of a chisel point, an emarginate chisel point, a Y, a thick, pointed tooth, or some intermediate shape => Notoncus ectatommoides
- Scutellum in the form of a thick, rounded tumulus or oval process => 4
- Large, slender species with long appendages, the antennal scapes much longer than (usually at least 1.2x) the length of the head proper, including clypeus => Notoncus spinisquamis
- Smaller, more robust species, the antennal scapes rarely, if ever, longer than the head proper, including clypeus, and usually shorter => Notoncus hickmani
- Propodeum at most very finely and superficially sculptured, essentially smooth and shiny; dorsum of gaster with only extremely sparse punctulation and appressed pubescence; mandibles very finely striate over most of dorsal surfaces (less so near insertions) => Notoncus gilberti
- Propodeum distinctly, widely and rather coarsely striate, and largely subopaque throughout; dorsum of gaster generally densely punctulate (weakly so in some individuals) and with dense appressed pubescence; mandibles largely smooth and shining above, with coarse punctures => 5
- Smaller species, maximum head width less than 1.6 mm; appressed pubescence present on all body tagmata, almost as thick on propodeum as on gaster, with density otherwise diminishing cephalad; head and mesosoma relatively finely sculptured, individual cephalic striae narrower than the diameter of an eye facet; propodeum rounded => Notoncus capitatus
- Larger species, maximum head width exceeding 1.9 mm; appressed pubescence almost entirely restricted to gaster; head and mesosoma much more coarsely sculptured, individual cephalic striae clearly wider than an eye facet; propodeum angular => Notoncus enormis
- Brown, W.L., Jr. (1955) A revision of the Australian ant genus Notoncus Emery, with notes on the other genera of Melophorini. Bulletin of the Museum of Comparative Zoology, 113, 471–494.
- Taylor, R. W. (1992). Nomenclature and distribution of some Australian and New Guinean ants of the subfamily Formicinae. Journal of the Australian Entomological Society. 31 : 57–69.