Camponotus nigroaeneus xuthus

Distribution
This taxon was described from Australia.

Nomenclature

 *  xuthus. Camponotus (Myrmophyma) nigroaeneus subsp. xuthus Emery, 1925b: 111 (s.w.) AUSTRALIA. [First available use of Camponotus (Myrmoturba) nigroaeneus r. divus var. xuthus Forel, 1915b: 97; unavailable name.] Raised to species: McArthur, 2009: 285.

Description
Worker. Length 6.7 to 8.5 mm. Worker major (for the form divus only the minor worker is described). Larger than the type and much less pubescent, also less glossy, with somewhat coarser sculpture and less erect pilosity. Node much thinner especially above. The head has convex sides and is less narrowing in front, less trapezoidal. The antennae funiculus is red (black with the type) and brown legs. Worker minor. Different from r.divus by its much thinner node, which is definitely bluntly rounded, but without a flat surface above, while divus has a less convex and very long surface above, which is as long as the base of the node and the anterior height. Above all the hairs on the tibias are sharp, half upstanding, while those if divus are quite flat lying. The thorax is less convex and the metanotum (= propodeum) has a somewhat longer declivity. But the head is in fact somewhat broader and shorter then with divus and behind is as narrow as in front, while with the type it is trapezoidal, broader behind than in front. The head has in addition an almost straight posterior border, while with divus as well as the type it is convex. The pubescence is much weaker than divus and much weaker than the type, the body length somewhat greater than divus. Kimberley District. (N W Australia)