148 Annals of the South African Museum. 



jecting above the pronotum. Petiole nodiform. Genital armature 

 large. sj 



Key to the $ % of Technomyrmex. 



(4). 1. Species more or less yellowish. 



(3). 2. Clypeus with the anterior margin deeply excised in the middle. 



arnoldinus, Forel. 

 (2). 3. Clypeus with the anterior margin only slightly excised. 



nigriventris, Santschi, race albinasu, Forel. 

 (1). 4. Dark brown species albipes, Smith, race Foreli, Emery. 



T. aenoldinus, Forel. (Plate IV., figs. 39, 39a.) 

 Deutsch. Ent. Zeit. Beiheft, p. 222, g , 1913. 



£ . 3-3-2 mm. Dirty brownish yellow, legs pale ochreous, apical 

 abdominal segments, and sides of 1st and 2nd segments brown ; or 

 thorax, legs and antennae yellowish brown, head pale brown, abdo- 

 men wholly dark brown. Head, pronotum, and abdomen smooth 

 and shining, mesonotum, dorsum of epinotum and mesopleura reticu- 

 late and rather dull, declivity of epinotum shining and very finely 

 transversely striate. Pubescence pale yellow, scanty on the body,, 

 denser on the legs. The pilosity consists of dark, erect and bristly 

 hairs, distributed in a peculiarly symmetrical manner as fol- 

 lows : there are 2 such hairs on the posterior margin of the head,, 

 the pronotum has a crescentic row of 6 hairs, parallel with its 

 anterior margin, three on each side, the mesonotum has a pair on 

 each side, and the margin of the declivity of the epinotum has. 

 3 on each side and 1 in the centre. This arrangement of the pilosity 

 is so distinctive in fresh specimens that it would alone serve to- 

 distinguish the species from all our other Dolichoderinae. 



Head about one-quarter longer than wide, the sides moderately 

 convex, the hind angles much rounded, the posterior margin straight- 

 Eyes moderately convex, situated at about the middle of the sides 

 of the head. Clypeus nearly flat, the anterior margin semicircularly 

 and widely excised in the middle. Mandibles smooth, shining and 

 sparsely punctured, the masticatory margin with about 7 small 

 teeth anteriorly, and finely denticulated posteriorly. Scape of 

 antenna reaches back a little beyond the occiput, 3rd-6th joints, 

 of the flagellum as wide as long, the rest longer than wide. Pro- 

 notum not so wide as the posterior margin of the head, quite one- 

 third wider than long ; pro-mesonotal suture distinct ; mesonotum 

 distinctly longer than wide, and as long as the pronotum. Meso- 

 epinotal suture deep. The dorsum of the epinotum much wider 

 than long, crescentic in outline when seen from above, and rising. 



