232 W. A. SANDS 



Keys to Species 

 Imagos 



i Fontanelle small to vestigial, short oval to circular, flat or slightly depressed, equal in 

 size to or smaller than medial spot, distinct and pale coloured to obscure, coloured 

 as head. Larger, W, 0-83-1-01 ......... 2 



- Fontanelle usually large, oval to elongate oval, pale and sharply distinct from head 



colour, larger than medial spot and often slightly raised ; small specimens, W under 

 o-8o, may have small inconspicuous fontanelle. Distribution, S. Africa to Tan- 

 zania ........... choanensis (p. 232) 



2 Postclypeus moderately to strongly inflated, with evenly rounded posterior margin 

 and distinct median suture, Pc1/Ra. 2-88-3-31; posterior margin of head capsule 

 unevenly rounded (Text-fig. 638) ...... cuniculator (p. 235) 



- Postclypeus strongly inflated with sinuate posterior margin and weak or indistinct 



median suture, Pc1/Ra, 3 - 59! posterior margin of head capsule evenly rounded 



scapheutes (p. 237) 



Workers 



1 Length of mixed segment, measured round outside of curve, 3-4 times width of 



mesenteron at insertion of malpighian tubules . . . cuniculator (p. 235) 



- Length of mixed segment, measured round outside of curve, more than five times 



width of mesenteron at insertion of malpighian tubules ..... 2 



2 Left mandible with proximal end of subsidiary marginal tooth well clear of molar 



prominence; enteric valve seating with three definite lobes and a short neck 

 connecting it to proctodeal pouch; postclypeus less inflated, Pcl/Ri, 1-59, apical 

 teeth of mandibles shorter, La/Li, 0-46, Ra/Pm, 0-65. Fore tibia more inflated, 

 Ti/T w , 308 .......... scapheutes (p. 237) 



- Left mandible with proximal end of subsidiary marginal tooth only just clear of 



molar prominence; enteric valve seating a circular rim or weakly lobed, sessile on 

 proctodeal pouch; postclypeus more inflated, Pcl/Ri, 2-50-3-40; apical teeth of 

 mandibles longer, L A /Li, 0-50-0-64, R A /Ri, 0-70-1-10; fore tibia less inflated, 

 Ti/T w , 3-52-4-00. (Most of these characters also apply to cuniculator.) 



choanensis (p. 232) 



Adaiphrotertnes choanensis (Fuller) comb. n. 

 (Text-figs 634-637 & 646-650; PI. 9, fig. 10) 



Mirotermes (Procubitermes) choanensis Fuller, 1925 : 184. LECTOTYPE $, Republic of 

 South Africa: Pretoria, Arcadia (National Collection of Isoptera, Pretoria) here designated 

 [examined]. 



Imago. Head capsule varies from sepia-brown to dark sepia-brown, pitch-black above ocelli; 

 fontanelle from very small, circular, slightly depressed and coloured as head, to larger than 

 ocelli, white, swollen, elongate oval; medial spot circular to oval about one-quarter size of 

 ocellus, usually slightly raised; postclypeus sepia-brown, labrum yellow-brown; frontal marks 

 variable, usually distinct, crescent-shaped, without setae, flat; antennae pale brown. Pronotum 

 sepia-brown, meso- and metanota brown, without dark sutures; legs, femora and tibia brown, 

 tarsi, pale yellow. Abdominal tergites sepia-brown, dorsal stigmata pale brown; sternites 

 brown, paler in mid-line, ventral stigmata also brown; cerci yellowish white. 



Posterior margin of head capsule evenly rounded; ocelli medium-sized, separated from 

 compound eyes by half to two-thirds own least diameter; postclypeus medium-sized to large and 

 moderately inflated, Pcl/W, 0-20-0-30, hind margin evenly rounded, median suture distinct. 



Pilosity of head capsule somewhat uneven with many long setae, not quite forming a pelt, 

 brown. 



