Camponotus bigenus

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 *  bigenus. Camponotus (Myrmocamelus) bigenus Santschi, 1919a: 333 (s.w.m.) AUSTRALIA. Combination in C. (Myrmophyma): Emery, 1925b: 110; Santschi, 1928e: 481.

Description
Worker major. Length 10mm. Red. Clypeus and mandibles darker red. Around the thorasic sutures and on top of the epinotum more brownish. Node and appendages dark red brown. Gaster black rimmed with yellow. Sculpture similar to pellax but the thorax is even richer in pits. Pilosity erect more abundant and longer than pellax. Head 3.2mm long, 2.9 mm wide, in other respects like pellax and capito Mayr. Clypeus flat with a moderate indentation at the border of feebly produced lobe. The frontal ridges reach the median occellus. Lateral occelli obsolete. Scape reaches occipital border. Thorax is 3.3mm long, shorter and more squat than pellax. Mesonotum wider than long and slightly raised towards the pronotal suture. Metanotum tends lower at the back, on the same level as the basal face of the epinotum (= propodeum), this latter being scarcely 1/4 longer than the declivity but forming a very rounded angle. The node is much wider than high, its sides narrow but blunt, form at the summit and at each side a rounded angle. Anterior face convex, posterior face flat. Viewed from the top the length is about 2.5 times the width. Worker Length 6.8-8.7mm. Black, condyle and scape ferruginous. Matte, densely and finely reticulate, front of head more strongly,gaster more finely than the thorax. Pilosity erect, white, long pointed abundant (40 to 60 on the thorax), richer on the gaster, poorer on the head. Long pubescence, yellow grey or pale gold, very abundant and close, not hiding the sculpture of the thorax but it does hide that of the gaster and almost the clypeus. Head rectangular, very much longer than wide, sides almost straight converging slightly in front. Posterior border and vertex convex. Eyes at the posterior quarter. Clypeus feebly keeled, anterior border crenulated. Frontal ridges slightly diverging. Mandibles finely punctate and strongly rugose, the external border is straight, armed with 7 or 8 teeth. Thorax is much shorter and more convex compared with pellax. The convex pronotum is strongly inclined at the front. The mesonotum is convex, not raised towards the pronotal suture which is strong. Metanotal suture is obsolete. The basal face of the epinotum straight or weakly concave passing through a wide curve to the declivity 1/2 to 1/4 shorter. Node, thicker than the height of its flat anterior surface and less than the posterior face which is vertical and convex from right to left. The summit is strongly rounded and projects forward a little. Male 7.5mm long.