A Monograph of the Formicidae of South Africa. 129 



Eace Ehodesiae, Forel. 

 Ann. Soc. Ent. Belg., vol. 57, p. Ill ; $ , 1913. 



The largest £ , 8-5 mm., of this race is smaller than that of the type, 

 and the smallest examples, 3 mm., hitherto found, are probably not 

 the minimum size. 



This race differs from the type and from baclius by its lighter, or 

 more straw-yellow colour. The head is shorter and more feebly 

 emarginate posteriorly, and hardly more than one-sixth longer than 

 wide. The node is as wide as long. 



Hab. Bulawayo. (S.A.M., E.M., G.A. colls.) 



Sub-Genus BHOGMUS, Shuckard. 



Ann. Nat. Hist., vol. 5, p. 323, 1840. Emery, Zool. Jahrb. Syst., 



vol. 8, p. 702, 1895. 



D. (Sub-G. Ehogmus) Fimbriatus, Shuckard. 

 (Plate IV., figs. 36, 36a.) 



Ann. Nat. Hist., vol. 5, p. 325, $ , 1810. Emery, Zool. Jahrb. 



Syst., vol. 8, p. 736, g , 1895. Brauns, Zeitschr. f. Hymen 



u. Dipt., vol. 3, p. 294, ? , 1903. 



This species is the only representative of the sub-genus in South 



Africa. The variation in the worker caste is more complicated than 



in the other species of the genus, owing to the fact that there is not a 



gradual differentiation between the largest and the smallest forms. 



There are practically four groups, having either 11, or 10, or 9, 



or 7-8 jointed antennae, each group having its maxima and minima 



forms, with the shape of the head varying according to the size 



of the insect. 



The forms with 11-jointed antennae vary in length from 8 to 3 - 5 mm. 



10 „ „ 3-1 to 2-7 mm. 



,, 9 ,, ,,3 to 2-6mm. 



7-8 ,, ,, 2-2tol-7mm. 



The ^ ^ of this species may be distinguished from either helvolus 

 or affinis by the absence of the spiniform posterior projections of the 

 frontal carinae, and also, in the largest examples, by the denser 

 puncturation and the dull thorax, which is finely but distinctly 

 rugulose. From fulvus, race badius, which this species resembles 

 in the indistinct pygidial impression, it may be distinguished in the 

 larger forms by the dull thorax, and in the smaller by the much 

 stronger puncturation. 



9 



