Strumigenys browni

Identification
The only member of the Strumigenys browni-group.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil.

Nomenclature

 *  browni. Pyramica browni Bolton, 2000: 168, figs. 123, 175 (w.) BRAZIL. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 116

Worker
Holotype. TL 2.2, HL 0.62, HW 0.39, CI 63, ML 0.08 (approximated as mandibles open), MI ca 13, SL 0.41, SI 105, PW 0.28, AL 0.60. Eye minute, of 3 very small ommatidia only. Scrobe very extensive, disproportionately broad when compared to the long slender scape and funiculus (see group diagnosis). In profile length of preocular carina distinctly less than distance between apex of carina and eye. Occipital lobes narrow in full-face view, their outer margins only shallowly convex, markedly convergent posteriorly to the prominent occipital angles. In full-face view clypeus and mediodorsal section of head to highest point of vertex smooth and shining. Behind and on each side of the smooth central area the cephalic dorsum with longitudinal or posteriorly divergent fine rugulae. Occipital margin bordered by a transversely arched thin cuticular crest. Ground pilosity of head from posterior margin of clypeus to highest point of vertex of simple arched acute hairs. Behind this the ground-pilosity of curved narrowly spatulate hairs that tend to be flattened or splayed apically. A number of flagellate hairs present: 3-4 pairs project laterally from the dorsolateral margins of the head in full-face view; 2-3 pairs arise from cephalic dorsum in profile (numbers approximate as both specimens of type series damaged). Pronotum not marginate, the dorsum rounding broadly into the sides. Pleurae and side of propodeum smooth and shining. Promesonotum dorsally finely longitudinally rugulose; propodeal dorsum and declivity reticulate-punctate. Ground pilosity of dorsal alitrunk of curved spatulate hairs, the mesonotum also with 1-2 pairs of long flagellate hairs. Dorsal surfaces of petiole, postpetiole and gaster with a mixture of curved elongate spatulate hairs and finer erect flagellate hairs. Dorsum of petiole node broader than long, with a few transverse rugulae; disc of postpetiole glassy smooth. Petiole ventrally with a conspicuous spongiform curtain that is deepest posteriorly, and with large lateral lobes. Anterior face of petiole node in profile almost vertical, only fractionally shorter than the dorsal length of the node. In dorsal view sides of both waist segments bordered with extensive spongiform tissue. Basigastral costulae numerous, short but sharply defined; first gastral tergite otherwise smooth.

Paratype. TL 2.2, HL 0.62, HW 0.40, CI 65, ML 0.08 (approximated as mandibles open), MI ca 13, SL 0.44, SI 110, PW 0.27, AL 0.60.

Type Material
Holotype worker, Brazil: Amazonas, Terra firm. ZF-02, km. 10 : capoeira, 02°34' S, 60°06'W, 7.xi.l990. Capoeira, ZF-2/solo, Extracao Kempsom Camada: 3a, Reg: K28, Prof: 7.0- 10.5 cm. (M. D. de A. Ribeiro).

Paratype. 1 worker with same data as holotype but Extracao Kempsom Camada: la, Reg: K26, Prof: 0-3.5 cm..