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Types Mus. Hist. Nat. Geneve.
Etymology Named after the collector, William (Guilelmi) Muller.
diagnosis A large reddish brown species, similar to antillanaHNS of the Lesser Antilles and aviaHNS, bucculentaHNS, hetschkoiHNS, heyeriHNS, hortonaeHNS, mamoreHNS, praesesHNS, rhytiferaHNS, and sarcinaHNS of South America.
Major: propodeal spines long, stout, and nearly erect; postpetiole cornulate; sculpturing of dorsal surface of head consists entirely of longitudinal carinulae, which are confined to the anterior two-thirds of the head capsule except for two carinulae that proceed to the occiput along the midline; promesonotal dorsum almost completely covered by transverse carinulae. The major is very similar to that of bucculentaHNS, but the minor is easily distinguished, as illustrated.
Minor: occiput, sides of head mesad to the eyes, and lateral margins of the pronotal dorsum rugoreticulate; remainder of dorsal surface of head weakly carinulate; propodeal spines long, thin, and erect.
Measurements (mm) Lectotype major: HW 2.10, HL 2.12, SL 0.98, EL 0.20, PW 1.02.
Paralectotype minor: HW 0.82, HL 0.84, SL 0.94, EL 0.14, PW 0.54.
Color Major: concolorous light reddish brown.
Minor: body yellowish brown, appendages medium to dark yellow.
Range Santa Catarina, Brazil. Also recorded from Misiones, Argentina, by Kempf (1972b).
Figure Upper: lectotype, major. Lower: paralectotype, minor. BRAZIL: Blumenau, Santa Catarina (William Midler). Scale bars = 1 mm.
Found most commonly in these habitats: 1 times found in orchard near a stream.
Found most commonly in these microhabitats: 1 (wingless0 female. Passages apparently about 4 inches long. Workers minor rather active times nest under turf on a dry rock. About 300 ants of which perhaps 1/8 work workers major, numerous males.
Elevations: collected at 91 m