Dolichoderus semiorbis

Dolichoderus semiorbis is known from a few specimens collected in low shrubland on a sand dune along the Western Australian coast.

Identification
Sculpturing on head consisting of large, shallow to moderately deep fovea; pronotum and propodeum lacking spines; posterior face of propodeum strongly concave, separated from the dorsal face by a distinct carina; pubescence on first gastral tergite sparse, if present hairs not overlapping; tibiae lacking erect hairs.

This species most closely resembles Dolichoderus albamaculus however it lacks erect hairs on its tibiae, and although possesses a distinct carina on the posterior face of the propodeum, it does not form a lip that projects vertically above the dorsum as it does in D. albamaculus. This species can be distinguished from Dolichoderus omicron, Dolichoderus canopus, Dolichoderus nigricornis and Dolichoderus formosus by the lack of erect hairs on its tibiae, and can be distinguished from Dolichoderus clusor, Dolichoderus scrobiculatus, and Dolichoderus turneri (which have abundant pubescence on the first gastral tergite) by the sparse or absent pubescence on the first gastral tergite.

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 *  semiorbis. Dolichoderus semiorbis Shattuck & Marsden, 2013: 138, fig. 25 (w.) AUSTRALIA.

Description
All known specimens show little variation.

Measurements (n=1). CI 78; EI 41; EL 0.28; HL 0.86; HW 0.67; ML 1.14; MTL 0.59; PronI 71; PronW 0.47; SI 105; SL 0.70.