82 W. A. SANDS 



prove to be wrong. A. irrixosus is closer in size to this species than to A. ignavus, 

 but it has a more inflated postclypeus and shorter head pilosity in the imago, and the 

 proportions of the worker mandibles are different. A . empodius is again distinguished 

 by differing mandibles in both imago and worker, also in the imago by the shorter 

 pilosity and the worker by the very different enteric valve seating. The worker 

 abdomen does not appear to be dehiscent. 



Holotype $ imago, paratype $ and <$ imagos, and workers from type-colony, 

 Zambia: Ndola, 30.1.1957 (W. G. H. Coaton) in National Collection of Isoptera, 

 No. TM 4110, Pretoria. 



Other paratype material. Zambia: Kitwe, 23. i. 1957 (W. G. H. Coaton) in N.C.I. 

 coll. No. TM 3920, Pretoria. 



No biological information is available about this species. 



Group III 



Astalotermes acholus sp. n. 



(Text-figs 156-159, 170, 171 & 178-183; PI. 1, fig. 6) 



Imago. Head capsule dark sepia-brown, very dark above ocelli; fontanelle subject to pro- 

 nounced sexual dimorphism, in $, large sunken pale brown area approximating in size to com- 

 pound eye, surface slightly irregular; in <$, small pitch-black elongate oval, slightly raised, or 

 obsolete, in either case surrounded by very dark sepia-brown flat area larger than ocellus; 

 medial spot circular, flat, minute, sepia-brown; postclypeus pale brown to brown, labrum 

 yellow; frontal marks very indistinct brown crescents, slightly depressed at inner ends; antennae 

 brown. Pronotum sepia-brown, meso- and metanota brown, transverse sutures very weak; 

 legs, femora pale yellow-brown, tibiae yellow, tarsi pale yellow; abdominal tergites and dorsal 

 stigmata sepia-brown, ventral stigmata and sternites brown, the latter paler in middle; cerci 

 pale yellow. 



Posterior margin of head capsule slightly undulating, not evenly rounded; ocelli fairly large, 

 separated from compound eyes by less than half own least diameter; postclypeus weakly 

 inflated, Pcl/W, 0-21-0-22, Pcl/R A , 2-23-2-51, posterior margin bowed, median suture absent. 

 Apical teeth of mandibles short, L A /Li, 0-52-0-64, Ra/Ri, 0-64-0-76; subsidiary marginal tooth 

 of left mandible well clear of molar prominence in surface view, complex ratio L A /Li.L m , 6-79- 

 8-09; first marginal tooth of right mandible slightly behind line of apical to second marginal, 

 its anterior margin slightly longer than that of second. Pilosity of head capsule yellow-brown, 

 uneven, no pelt. Meso- and metanota narrow at constriction, M/W, 0-23-0-25. Fore tibia 

 with third apical spur shorter but distinct. 



Measurements (two specimens from one locality) in millimetres. 



Head width across eyes (W) . . 0-85-0-92 

 Ocellus (O w x Oi) .... 0-08 x 0-11-0-12 



Ocellus to eye (O-E) . . . 0-03-0-04 



Postclypeus length (Pel) . . . 0-19-0-20 



Antennal article III .... 0-03-0-04 



Antennal article IV . . . . 0-04-0-05 



Antennal article V . . . . 0-04-0-05 

 Left mandible, apical to first marginal 



(La) 007-009 



Left mandible, first to third marginal 



(Li) 0-14 



