OIO-OII 



0107 



0-57-0-58 



o-574 



0-20-0-23 



0219 



OIO-O-II 



0105 



— 



0126 



004-005 



0-047 



O-OI-OII 



0105 



— 



0-099 



005-006 



0055 



118 W. A. SANDS 



of proctodeum by distinct neck. Membranous wall of valve beyond cushions without detectable 

 spicules. 



Measurements (three specimens from three nest-series) in millimetres. 



Range Mean 



Head width (W) ...... 0-79-0-85 0812 



Fore tibia width (T w ) • 



Fore tibia length (Ti) .... 



Postclypeus length (Pel) 

 Left mandible, apical to first marginal (La) 

 Left mandible, first to third marginal (Li) 

 Left mandible, third marginal to molar (L m ) 

 Right mandible, apical to first marginal (Ra) 

 Right mandible, first to second marginal (Rj 

 Right mandible, second marginal to molar (R m ) 



Comparisons of A . hilarus with A . aneristus and A . apocnetus have already been 

 made under those species-headings. In A. mansuetus the imago is distinguished 

 by its large fontanelle, more inflated postclypeus, and shorter mandibular apical 

 teeth. The latter feature also applies to the worker in which the anterior edges of 

 right first and second marginals are approximately equal. The enteric valve seating 

 has a very long neck in this species. In A . pacatus the large eyes and ocelli character- 

 ize the imago which, like the worker, has shorter apical teeth. The enteric valve 

 seating is two-lobed and dorsal in A. pacatus workers. A. prosenus is again easily 

 recognized by its large size, pale fontanelle, even pilosity, and, in the worker, its 

 short mesenteric overlap with the proctodeum. The worker abdomen appears 

 dehiscent in A. hilarus. 



Holotype $ imago (queen), paratype <$ (king) and workers from type-colony, 

 Democratic Republic of Congo: Katanga, Keyberg, 21. iv. 1948 {A. E. Emerson) 

 in American Museum of Natural History. 



Other paratype material: Democratic Republic of Congo: Katanga, Keyberg 

 (two vials), 21 & 25. iv. 1948 (A. E. Emerson), in AMNH. (One paratype queen 

 and worker also in BMNH.) 



The three known nest-series, all from the same locality, were recorded from the 

 mounds of Cubitermes sp. and Trinervitermes sp. in savanna woodland. 



Astratotermes mansuetus sp. n. 



(Text-figs 274, 275, 280, 281 & 286-291; PI. 2, fig. 4) 



Imago. Head capsule sepia-brown, darker above ocelli; fontanelle slightly smaller than 

 ocellus, circular, flat, pale yellow-brown; medial spot circular, less than half size of fontanelle, 

 slightly raised, brown; postclypeus brown, labrum yellow; frontal marks distinct, flat, semi- 

 circular, brown; antennae very pale yellow-brown. Pronotum, meso- and metanota brown, 

 transverse dark sutures present but not distinct; legs, femora pale yellow-brown, tibiae paler, 

 tarsi yellow-white. Abdominal tergites pale brown, dorsal stigmata paler, sternites yellow- 

 brown, ventral stigmata pale; cerci yellow-white. 



Posterior margin of head capsule not quite evenly rounded, slightly undulating behind eyes; 

 ocelli medium-sized, separated from compound eyes by about own least diameter; postclypeus 

 moderately inflated, Pcl/W, 0-26, posterior margin evenly rounded, median suture present. 

 Apical teeth of mandibles short, La/Li, 0-59, Ra/Ri, 0-76; subsidiary marginal tooth of left 



