A Monograph of the Formicidae of South Africa. 123 



of the petiole, which is less shining, is more abundant. Otherwise 

 like the type. 



Eace Zimmeemanni, Santschi. 

 Eev. Suisse Zool., vol. 18, p. 738, 1/, 2 , $ , 1910. 



11 8 mm. Colour, puncturation and general characters exceed- 

 ingly similar to those of helvolus. The sides of the head are, how- 

 ever, slightly sinuate ; the teeth of the mandibles more acute, and 

 the petiole a very little wider. The ventral lamella of the petiole is 

 produced behind into a sharp spine, pointing downwards (the lamella 

 is truncate in helvolus 1/). 



£ media, 6-34 mm. These do not appear to me to present any 

 appreciable differences sufficient to distinguish them from workers 

 of helvolus of the same size ; the ventral lamella is not spinously 

 produced as in the %. Of the smallest £ $ (2 mm.) described by 

 Santschi, I have seen no examples ; they have 8-jointed antennae. 

 My specimens have been named for me by Dr. Forel, but I must 

 confess that to me they appear so exceedingly similar to helvolus, 

 as to be almost indistinguishable, except in the character of the 

 ventral lamella in the 7/. 



"J 19-20 mm. Yellowish brown. Head, mandibles, and femora 

 brown-black. There are two short brownish bands on the middle 

 of the mesonotum anteriorly. Laterally, a band twice as long as 

 the preceding covers the parapsidal sutures. There is also a long 

 band on the posterior margins of the abdominal segments. The 

 petiole is entirely yellowish brown except the portion articulating 

 with the abdomen, which is blackish brown. Antennae and legs 

 dark reddish brown. Pilosity rusty on and below the head, rather 

 sparse on the front of the pronotum, more abundant on the epinotum 

 and petiole. The rest of the body is covered with a fairly dense 

 pubescence, fairly long on the thorax, but shorter on the abdomen. 

 The head is small, as in moestus, but a little wider. The eyes are 

 dull and small, with distinct facets. The distance between the 

 lateral ocelli much shorter than that separating them from the eyes. 

 Mandibles wider than in the type, the outer edge less emarginate, 

 straighter. The scape is as long as the first 6 joints of the flagellum 

 taken together ; 2nd joint of flagellum pubescent beneath, hardly 

 longer than half the succeeding joint. Length of thorax, 7 mm. ; 

 width in the middle, 4 mm. Length of the front wing, 145 mm. 

 Petiole narrower than in affinis, wider than in moestus. Abdomen 

 3 - 8 mm. wide, cylindrical. Genital armature brownish, 5 mm. long 

 by 3 mm. wide. The extremity of the stipites is narrower than in 



