A Monograph of the Formicidae of South Africa. 727 



a specimen from the Victoria Falls, the abdomen is dull and finely 

 reticulate-punctate). Wings tinged with yellowish brown, nervures 

 brown, stigma piceous. 



S. Rhodesia ; fairly common wherever there is large timber. This 

 species has a very offensive and powerful cockroach odour. The 

 smaller $$ are not uncommonly seen climbing the trunks of trees 

 in company with Gremastogaster castanea, race rufonigra Em., to which 

 they bear a strong resemblance to the naked eye. 



(S.A.M., R.M., G.A. colls. ; type of $ in my collection). 



Robecchii, race troglodytes, Forel. 

 (as species) Mitt. Schweiz. Ent. Ges., vol. 9, p. 68, & 1894. 



2J., 7-9 mm. Yellowish brick-red, the last three abdominal segments 

 becoming gradually darker or reddish brown towards the apex, tibiae 

 and anterior margin of the head dark reddish brown. The funda- 

 mental sculpture like that of race rhodesiana but distinctly stronger, 

 the punctures and reticulations more sharply defined. On the other 

 hand, the large pit-like punctures on the head are smaller and shallower. 

 The pubescence is a little more abundant and longer on the abdomen, 

 and the pilosity much longer and more plentiful. The meso-epinotal 

 suture is much shallower than in rhodesiana, and the convexity of the 

 dorsum of the thorax is continuous, the dorsum of the epinotum not 

 lying at a lower level than the mesonotum. Abdomen very finely 

 reticulate-punctate and dull, the basal fourth of the 2nd and follow- 

 ing segments transversely rugulose and slightly shining. There is 

 a median longitudinal line which is glabrous, but rather indistinct 

 since the rest of the abdomen is not plentifully pubescent. Otherwise 

 like rhodesiana. 



$ media and minor. These differ from their 2| in the same way as 

 they do in rhodesiana. The smallest ^ have the pale colour extending 

 further back on the abdomen, i.e. to the middle of the 3rd segment. 



$, 10-5 mm. (hitherto undescribed). Sculpture, pilosity and 

 pubescence as in the 2j.. Colour similar but darker all over, the 

 posterior half of the thorax darker than the anterior, or reddish 

 brown ; abdomen very dark brownish red, or brown on the basal 

 third and the rest blackish brown, the apex black. Sculpture of the 

 abdomen stronger than in the 21 , the basal half of the 2nd and following 

 segments slightly shining and transversely striolate, the 1st segment 

 and apical halves of the other segments sharply reticulate-punctate 

 and dull. Otherwise like the $ of rhodesiana. 



