A Monograph of the Formicidae of South Africa. 99 



the base above. The constriction between the 1st and 2nd abdominal 

 segments quite as distinct as in the £ . Legs long and slender. 

 Wings fuscous, stigma, and nervures yellowish brown. 

 Durban. (C. B. Cooper.) (S.A.M., E.M., G.A. colls.) 



L. (Lobopblta) Arnoldi, Forel. (Plate III., figs. 27, 27a, 28.) 

 Ann. Soc. Ent. Belg., vol. 57, p. 110, £ $ , 1913. 



£ . 63 mm. Black ; extreme apex of abdomen piceous, man- 

 dibles, flagellum, base of scape, basal half of tibiae, and tarsi reddish 

 brown. Head shining, thorax and petiole slightly dull, abdomen 

 very shining and impunctate. Head closely and finely punctured, 

 especially at the sides, very finely striate in front between the 

 clypeus and the eyes. Median dorsal portion of pro- and meso- 

 notum shining and impunctate, the sides of the same, the pleurae, 

 epinotum and the node very finely rugulose and dull. The declivity 

 of the epinotum strongly and transversely rugose. Legs and 

 antennae with an inconspicuous and sparse pubescence. The whole 

 insect covered with long, oblique yellowish hairs, which are denser 

 arid longer on the clypeus and abdomen. Head a little longer than 

 wide ; including the mandibles, somewhat oval. Clypeus triangular, 

 carinate in the middle, the anterior margin narrowly membranous. 

 Frontal carinae narrow. Mandibles shining and sparsely punctured ; 

 they are wider towards the apex than at the base, convex above 

 from base to apex and also on the external margin ; the masticatory 

 margin is edentate, joining the inner margin in a gradual curve, the 

 apex acuminate. Byes large, convex, and situated at the middle of 

 the sides of the head. The antennae reach back as far as the base 

 of the abdomen, the scape is rather flattened dorso-ventrally, the 

 flagellum slightly incrassate towards the apex, 8th to 10th joints 

 wider than long. Thoracic sutures distinct ; pronotum as long as 

 wide, mesonotum quadrate, margined all round by a distinct sulcus. 

 Dorsum of epinotum not quite as long as the pro- and mesonotum 

 together, wider at the apex than at the base ; declivity rather 

 abrupt, triangular in outline and with strong transverse striae. 

 Node of petiole sub-cubic, very slightly wider than long, rounded 

 above and at the sides, vertically truncate behind and in front, and 

 wider behind than in front. First abdominal segment convex at the 

 sides, shorter than the 2nd segment, the constriction between the 

 two distinct. Apical segment slightly compressed laterally. First 

 segment produced at the base ventrally into a blunt tooth. 



? . Ergatoid (hitherto undescribed). 9 mm. Abdomen, 4 mm. 

 long, 1st segment 1*5 mm. wide. This differs from the £ by its 



