488 Annals of the South African Museum. 



(42) 41. Head distinctly reddish . acaciae, Forel, race victoriosa, Santschi. 

 (41) 42. Head yellowish or more or less brown. 



(44) 43. Lateral margins of the disc of the mesonotum bevelled 



brunneipennis Andre, var. omniparens, Forel. 



(43) 44. Lateral margins of mesonotum not bevelled 



■ Neuvillei, Forel, race Cooperi, Forel. 



(34) 45. Sides of mesonotum distinctly marginate over the greater part of their 



length ; the sides of the pronotum also sharply marginate, at least 



over their posterior half .... Group C, q.v. infra. 



(1) 46. Antennse 10-jointed . Group D, subgenus Decracrema, Forel. 



The four groups mentioned in the key are composed of the following 

 species. 



Group A. — Peringueyi, Em. ; monticola, Arnold ; opaciceps, Mayr ; 

 solers, Forel ; with their varieties and races. 



Group B. — Godefreyi, Forel; bulawayensis, Forel; misella, Arnold ; 

 with their varieties and races. 



Group G. — Gastanea, Smith; scrutans, Forel ; excisa, Mayr; impressa, 

 Emery ; with their varieties and races (var. medio-rufa hardly fits in 

 with their group, but it cannot be placed elsewhere). 



Group D. — Liengmei, Forel; Arthur-Muelleri, Forel; with their 

 varieties and races. 



Three sub-genera are represented in our region, viz. Atopogyne, 

 Forel ; Oxygyne, Forel ; and Decracrema, Forel. These will be dealt 

 with in their place further on. 



C. castanea, Smith. 

 Cat. Hymen. B.M., vol. 6, p. 136, £, ?, 1858. 



" ^ . Length 2 lines (4*1 mm.). Head and thorax rufo-ferruginous, 

 abdomen brownish-black, with the base obscure rufo-fuscous. The 

 head, seen from above, rotundate, scarcely shining; the thorax 

 deeply constricted at the base of the metathorax (epinotum), which is 

 armed with two diverging acute spines ; the legs ferruginous, the 

 tibiae and tarsi darkest. Abdomen : the 1st node of the petiole, 

 viewed in front, heart-shaped, the pointed end upwards ; the 2nd 

 node globose, with a deep longitudinal incision above. 



" $ . Length 4 lines. Rufo-ferruginous, smooth and shining ; the 

 thorax with a central and two lateral longitudinal rufo-fuscous stripes, 

 the metathorax not spined; wings hyaline, the nervures testaceous. 

 Abdomen oblong, the apical margins of the segments fuscous, slightly 

 depressed and thinly sprinkled with short cinereous pubescence." 



It has been shown by Emery that tricolor, Gerst., as a specific name 



