114 Annals of the South African Museum. 



Head smaller, but not narrower in front than behind ; clypeus 

 more protuberant ; antennal joints of the normal number. 



3. Very small or pigmy workers. 



Head narrower in front than behind ; clypeus strongly pro- 

 tuberant ; antennal joints reduced in number, but not less than 7. 



All three forms are totally devoid of eyes. The frontal carinae 

 are near together and vertical ; pro-mesontal suture distinct, meso- 

 epinotal obsolete. Bpinotum without spines. Petiole nodiform. 

 Pygidium impressed and ending in three points. Posterior tibiae 

 with a pectinate calcar. 



? . Apterous ; without eyes or ocelli. Head with the occipital 

 portion gibbous and divided by a median groove. Clypeus as in 

 the 2£ . Frontal carinae not close together. Mandibles narrow and 

 ■edentate. Antennae with 11 joints, or 12 in sub-genus Dichthadia. 

 Thorax segmented, mesonotum not differentiated into scutum and 

 scutellum, Petiole broad, its posterior angles more or less produced 

 into blunt points. First abdominal segment shorter, than the 2nd. 

 •Cloaca open ; the hypopygium extends beyond the pygidium. 



$ . Antennae 13-jointed, scape one-quarter or one-third as long 

 as the flagellum. Mandibles edentate ; clypeus short and pro- 

 longed between the frontal carinae, which are short and divergent. 

 The scutum of the mesonotum overhangs the pronotum. All the 

 femora flattened, the tibiae short. Eyes and ocelli very large. 



Petiole nodiform or saucer-shaped, the concavity directed behind. 



Genital armature totally retractile ; lacinia absent, sub-genital 

 plate deeply cleft. 



The Dorylini are found in Africa, Asia, and the Malay Arcbipelago. 

 They do not occur in Madagascar. 



Key to the Sub-Genera. 

 % % or 1/1/. 

 (2). 1. Antennae 12-jointed in the U, and in the large and medium-sized $ . 



Dichthadia, Gerst. 

 (1). 2. Antennae with less than 12 joints. 

 (10). 3. Antennae 10- or 11-jointed. 

 (7). 4. Pygidium with a semi-circular impression, the margins of which are 



sharp (see Plate IV., fig. 38a). Antennae 11-jointed. 

 (0). 5. Antennae short and thick, all the joints of the flagellum except the last, 



much wider than long Dorylus, Fabr. (s. str.) 



(5). 6. Antennae elongate, at least some of the joints of the flagellum longer than 



wide Anomma, Shuckard. 



{4). 7. The impressed area of the pygidium without sharp margins (see Plate IV., 



fig. 31a). 

 (9). 8. Sub-apical tooth of mandible simple; antennae 11-jointed. 5 max. 



13 mm. long Typhlopone, Westwood. 



