720 Annals of the South African Museum. 



the sides straight, the posterior margin feebly concave in the middle, 

 the posterior angles nearly rectangular. Mesonotum a little longer 

 than wide, the scutellum not quite half the length of the mesonotum. 

 Dorsum of epinotum hardly wider at the base than at the apex, two 

 and two-third times wider than long ; declivity one-third longer than 

 the dorsum, vertical, its brow rounded. Scale as in the 21. Wings 

 hyaline, nervures and stigma ochreous. Otherwise like the 21.. 



Nesting in hollow trunks and stems of trees, the communities 

 exceedingly populous. The walls of the galleries in the nest are 

 composed of a dark carton-like material, similar to that of the 

 European Lasius fuliginosus, which species reginae also resembles in 

 having the same sort of aromatic odour. A vicious species which 

 emerges from its nest in hundreds on the slightest alarm, and bites 

 fiercely. 



Victoria Falls and Malindi, S. Rhodesia. 



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



C. barbarossa, Emery, race arminius, Forel. 

 (race) Ann. Soc Ent, Belg., vol. 54, p. 457, 21, & 1910. 



"£, 5-9 mm. 



21. . Clypeus wider and shorter than in the type of the species, 

 grooved along its whole length by a median longitudinal groove, in 

 place of the usual carina, (the type species has no groove). Head 

 slightly shorter, the sides a little more convex. Meso-epinotal 

 suture much stronger and deeper, exactly as in Meinerti (= vividus 

 Smith). Dorsum of the epinotum a little more distinctly marginate 

 than in the type of Barbarossa, but less than in Meinerti, one and a half 

 times longer than wide, as in the type of the species. The angle 

 of junction between the dorsum and declivity is more obtuse, less 

 distinct than in the type. Sculpture of the front of the head as 

 in the type, the large pit-like punctures more distinct and deeper, 

 but the fundamental reticulate-punctate sciilpture is less dull, more 

 superficial, more or less subopaque on the whole head and on the 

 thorax. The fulvous pilosity brilliant, as in the typical Barbarossa, 

 but much less abundant, on the head as well as on the abdomen ; the 

 pubescence on the latter is much shorter and scantier. Otherwise 

 like the type of the species. 



^ minor. Clypeus carinate. The differences between it and the 

 type species less accentuated than in the 2|., excepting the pubescence. 

 No large foveae on the head. 



