This information was extracted from Ritchie (1980): "Antennae of male lacking. Fastigium of vertex convex. Pronotum with median carina high arcuate, sometimes intersected by posterior sulcus; dorsum with numerous pale globular warts, often forming rows; hind margin elongated, rounded acutangular (Plate 25). Tegmen surpassing folded hind knees by one fifth of hind femur length. Genitalia with strongly protruding aedeagus and large bulbous subapical ventral process; outer lobe of lophi laterally elongated, forming a low, lozenge-shaped bump. Ventral ovipositor valves with external lateral surface distinctly excavated. Colouration typical for genus. Pronotal x-marking with posterior arms thicker than anterior arms; metazona with several indistinct pale striae extending outwards and backwards on each side of median carina. Tegmen as in G. africanus, with two transverse light bands two and four sevenths along from base. Hind wing with strong complete fascia; basal area pale greenish yellow with some pale bluish tinting at the bases of main veins, more extensive in females. Hind femur externally with two indistinct oblique bands; internal and external upper and lower carinulae with regularly spaced black dots; internal surface in male with some dark shading in basal half, in female straw-coloured; ventral surface from lower carinula blue-grey. Hind tibia orange red, spines black-tipped".

On the basis of the genitalia, the rugosity of the pronotum, and the blue tint of the ventral surface of the hind femur, Gastrimargus wahlbergii is closely related to G. angolensis. This species is, however, also has affinities with G. mirabilis and its allies in the large aedeagus with the pronounced subapical ventral process, and the warty integument of the pronotum with its raised carina (Ritchie 1980).

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Gastrimargus wahlbergii is known from the eastern half of South Africa and Lesotho. The record from Angola (Bolivar, 1881) is probably erroneous (Ritchie 1980).

In South Africa, Gastrimargus wahlbergi in the Eastern Cape, Gauteng, Limpopo and Mpumalanga Provinces (Naran & Bazelet 2013).

Grasshoppers usually move by walking or jumping, but most adults fly, often exposing brightly coloured hindwings. Their adaptations for movement include the forewings (called tegmina) which are thickened and with numerous veins; the hind wings also contain many veins but are membranous, fanlike, and folded when in repose. Most Orthoptera display hind legs enlarged and adapted for jumping (Gibb & Oseto, 2006). Gastrimargus species are strong fliers (Picker et al. 2012).

Herbivore - Graminivore (grass-eating)

Orthopterans have well-developed mandibles and their mouthparts are adapted for chewing. They are mainly herbivorous, favouring a range of grasses and often consuming more even than antelope and cattle (up to 130 kg of grass yearly per hectare). Gastrimargus species feed on soft and tough grasses, of the subfamily Andropogonae (Picker et al. 2012).

Females in orthopterans have the egg-laying tube which is short and usually concealed, as are the male genitalia, and the abdomen in males always turns up at the end. Eggs are laid in groups in soil and mixed with a frothy substance that hardens to form the egg pod. Gastrimargus species eggs are over-wintered and they produce one generation in a year (Picker et al. 2012).

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