A Monograph of the Formicidae of South Africa. 521 



nearly round. Second segment wider than long, widely impressed 

 above posteriorly. Abdomen distinctly flattened, truncate at the 

 base. With a silky gloss, shallowly and sparsely punctured all over ; 

 abdomen and legs somewhat more shining. Head and thorax very 

 closely and fairly finely striate longitudinally, with a finer sculpture 

 between the striae ; pronotum transversely striate above. The striae 

 on the head diverge posteriorly. Petiole and abdomen finely reticulate- 

 punctate. Legs reticulate, the scape longitudinally striate. Somewhat 

 sparsely clothed all over with yellowish decumbent hairs, the out- 

 standing pilosity very scanty. Scapes with short oblique hairs, the 

 tibiae with decumbent hairs only. Reddish-brown. Scapes, tibiae, 

 tarsi and vertex darker brown ; abdomen more dirty yellow-brown, 

 with darker transverse bands. 



" Benguella (Buchner)." 



The type-species has not been recorded from our region, but in view 

 of Forel's latest pronouncement in regard to it and sevei - al allied 

 forms, I have reproduced the original description. 



Dr. Forel (Rev. Suisse Zool., vol. 24, p. 411, 1916) is now of the 

 opinion that the evidence presented by the numerous annectant 

 varieties necessitates the inclusion of the following species as mere 

 races of JBuchneri : Jcasaiensis, Forel; vulcania, Santschi; impressiceps, 

 Mayr ; excisa, Mayr ; impressa, Emery ; Kohli, Forel ; Alulai, Emery ; 

 and MeneliM, Forel. On the other hand, Santschi has recently raised 

 africana, Mayr, var. bulawayensis, Forel, to the rank of species ; I adopt 

 this arrangement for the present, although it is likely that the 

 discovery of new forms later on may require its being linked again to 

 the race africana of Buchneri or to the type of the species. 



Race africana, Mayr, described originally from the Cameroons, has 

 not been recorded within the limits of our region. 



C. bulawayensis, Forel. (Plate VI, figs. 74, 74 a.) 



(As var. of race africana) Ann. Soc. Ent. Belg., vol. 57, p. 125, ^ > 



1913. 

 (Synonym, gallicola, var. oracluni) Rev. Zool. Afr., vol. 2, p. 323, 



£, 1913. 



^ . 3-41 mm. Piceous brown, the anterior half of the head and 

 sometimes the thorax with a reddish tinge ; legs bi'own, flagellum 

 brownish-red, the club (excepting apical half of last joint) paler or 

 yellowish red. Pilosity absent, excepting a few hairs on the clypeus 

 and pronotum. Pubescence very fine and decumbent, almost absent 

 on the thorax and very sparse elsewhere. Head, thorax and petiole 



