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Tetramorium melanogyna MannHNS, 1919: 345, fig. 28. Syntype workers, female, Solomon Is.: Ugi, Pawa, 1916 (W. M. Mann) and Three Sisters, Malapaina, 1916 (W. M. Mann) (MCZ, Cambridge; USNM, Washington) [examined]. Tetramorium melanogyna MannHNS; Bolton, 1977: 99 [as synonym of T. insolens (F. Smith)HNS].
A critical reappraisal of the material of melanogynaHNS presently available for study has convinced me that I was mistaken in synonymizing this species with the much more widespread T. insolensHNS, and I hereby reverse that decision, restoring melanogynaHNS to its original status as a good species.
As far as is known melanogynaHNS is restricted to the Solomon Islands and thus it is only specimens from here which may be confused with insolensHNS, which also occurs on these islands. Samples of melanogynaHNS workers will key out at insolensHNS in Bolton (1977), but the two may be distinguished as follows.
Gaster lighter in shade than head and alitrunk.
Hairs on dorsal (outer) surface of hind tibiae suberect to subdecumbent.
Rugoreticulum on postpetiole dorsum very strong, as well developed as on pronotum.
In a majority of workers the rugose sculpturing of the alitrunk forming a transverse ridge at promesonotal junction.
Gaster darker in shade than head and alitrunk, or at least with an infuscated transverse band.
Hairs on dorsal (outer) surface of hind tibiae decumbent to appressed.
Rugoreticulum on postpetiole dorsum weak, more feebly developed than on pronotum.
Rugose sculpturing of alitrunk not forming a transverse ridge at promesonotal junction.
The queens of the two species are easily distinguished as in insolensHNS the female has the same colouring as the workers, whilst in melanogynaHNS the queen is uniform dark brown. Other names given as synonyms of insolensHNS in Bolton (1977: 99) remain as such.
Correction to key. In the key to TetramoriumHNS of the Oriental and Indo-Australian regions (Bolton, 1977: 72), the second half of couplet 13 should read, ' Dorsum of postpetiole unsculptured. .. ', not ' Dorsum of petiole' as is printed. This brings it in line with the first half of the couplet.
Found most commonly in these habitats: 1 times found in primary rainforest.
Found most commonly in these microhabitats: 1 times nesting in ant-plant.
Collected most commonly using these methods: 1 times H.
Elevations: collected at 840 m
Collect Date Range: collected between 2008-02-04 and 2008-02-05
Type specimens: syntype of Tetramorium melanogyna: casent0901079