A Monograph of the Formicidae of South Africa. 523 



declivity is more oblique and less abrupt above, but in looking through 

 a large series a complete gradation will be found between one extreme 

 and the other. 



Var. rhodesiana, Forel. (Plate VI, figs. 82, 82 a.) 



(0. inermis, Mayr, race delagoensis, var.) Ann. Soc. Ent. Belg., 

 vol. 57, p. 126, £, 1913. 



This variety must be removed from the inermis group, to which it 

 bears a superficial resemblance in the sculpture and shape of the 

 petiole. It differs from it quite clearly by the presence of distinct 

 epinotal teeth and by the shape of the mesonotum. It is exceedingly 

 closely allied to bidawayensis, i. sp. From the latter it differs as 

 follows : 



The size is greater, 3 - 2-4 - 4 mm. The head is duller and more 

 densely rugulose. The thorax is also duller and has a very close and 



Fig. 43. — C. bulaivayensis, Forel, var. rhodesiana, Forel. 



somewhat coriaceous reticulate sculpture, over which is superimposed 

 a sparse and longitudinal rugosity ; the epinotal teeth are more robust. 



Bulawayo; Victoria Falls. (S.A.M., E.M., G.A. colls). 



The specimens from the Victoria Falls have the middle of the head 

 a little more shining, and the meso-epinotal suture deeper and 

 narrower.* 



Var. desperans, Forel. 



(C. gabonensis, Em., var.) Bull. Soc. Vaud. Sc. Nat., vol. 50, p. 233, 

 ? , 1914. 



$. 3'2-4 ram. Reddish-brown, the thorax and petiole paler, the 

 basal third of the abdomen paler than the apex, the anterior third of the 

 head more yellowish-red; flagellum ferruginous, tarsi brownish-ochreous. 

 Pubescence long, decumbent, pale whitish-yellow, fairly abundant all 

 over, on the abdomen very abundant and sparse on the legs. Sculpture 

 of head and thorax like that of the type of the species but a little 

 stronger, the surface duller. Petiole closely reticulate- punctate and 



* The profile figure in Plate VI is inaccurate, the convexity of the mesonotum 

 having been somewhat exaggerated. For this reason I add a corrected drawing 

 in Text-fig. 13. 



