A Monograph of the Formicidae of South Africa. 103 



Owing to the insertion of the mandibles being so closely approxi- 

 mated, the clypeus which lies between their bases and the frontal 

 carinae is very narrow and short. Abdominal constriction absent in 

 Odontomachus, and in some species of Anochetus. Claws simple. 

 $ . Abdomen similar to that of the $ , but in Odontomachus 

 there is a slight constriction. Claws simple, hardly dentate. 



J 

 Key to the Genera of Odontomachini. 



1. 8 and ? . Antennal hollows confluent posteriorly : <? pygidium spined. 



Odontomachus, Latreille. 



2. 5 and ?. Antennal hollows not confluent posteriorly ; <? pygidium not spined. 



Anochetus, Mayr. 



Genus ANOCHETUS, Mayr. 



Europ. Eormiciden, p. 53, 1861. 



Characters. 



g . Antennal hollows not confluent ; no large depressions on the 

 sides of the head. The shape of the mandibles is very variable. 

 Node of petiole squamiform, or bidentate and nodose, conical or 

 terminating in a spine. 



? . Similar to the $ , winged, in some species ergatoid. 



$ . Mandibles and antennae as in Odontomachus ; node of petiole 

 more or less pointed or emarginate. Abdominal constriction absent. 

 Pygidium not spined. 



Key to the $ % of Anochetus. 



(6). 1. Node of petiole squamiform or nearly so, almost linear dorsally. 



(3). 2. Pro- and mesonotum strongly rugose Bequaerti, Forel. 



(2). 3. Pro- and mesonotum not rugose. 



(5). 4. Pro- and mesonotum strongly punctured; dorsum of node, seen from in 



front, very convex from side to side talpa, Forel. 



(4). 5. Pro- and mesonotum very feebly and sparsely punctured ; dorsum of node 



almost horizontal punctaticeps, Mayr. 



(1). 6. Node of petiole thick, dorsal surface not linear .. Levaillaiiti, Emery. 



A. Bequaerti, Forel. 



Eev. Zool. Africaine, vol. 2, p. 309, $ , 1913. 



5 . 5 - 3-5 - 5 mm. Head dark ochreous red, thorax brownish 

 black, abdomen black, legs and antennae dirty yellow. A very fine 

 and scanty pubescence on the head, antennae, and legs. Body, but 

 not the legs, with scattered yellowish hairs, longer and stouter on 

 the abdomen. Head sub-opaque, densely and finely striated from 



