i 7 4 W. A. SANDS 



Right mandible, first to second mar- 

 ginal (Ri) ..... on 



Right mandible, second marginal to 



molar (R m ) .... 0-06-0-07 



A. rastratus is compared with A. ctenopher, A. muricahis and A. pectinatus under 

 those species. In the imago caste, it differs from all the remaining species other 

 than A. retifaciens in having rather large eyes and ocelli, close together. The 

 latter species is smaller, with a feebly inflated postclypeus, and the ocelli even closer 

 to the eyes. In the worker, A. retifaciens has two rows of spines on the dilated end 

 of enteric valve cushion 1, and long, slender, hooked spines on positions 2, 3 and 4. 

 A. sentosus is again recognizable by the fenestrated base and sclerotized cup of 

 position 1, A. spinnlatus by the more numerous spines on position 1 and the slender 

 spines in the other positions, and A. tranquillus by the incomplete sclerotization 

 of the shorter cushion position 1. 



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

 Kenya: Nyambeni Hills, 22 m. from Meru, alt. 4,000 ft, 21. ii. 1953 (W. A. Sands, 

 Coll. No. S409) in British Museum (Natural History). 



Other paratype material. Tanzania: Amani, Kizugu, 3.xi.i95o, queen and 

 workers, Amani, Monga Road, 2.iii.i95i (P. B. Kemp), workers only, in BMNH. 



This species was found in low amorphous mounds apparently of its own 

 construction, and under dead wood. 



Ateuchotermes retifaciens sp. n. 



(Text-figs 445-447. 454. 455 & 462-467; PI. 6, figs 6-8) 



Imago. Head capsule brown, not darker above ocelli; fontanelle irregularly oval, almost 

 vestigial, much smaller than ocellus, flat or slightly depressed, pale or yellow-brown; medial 

 spot oval, flat, nearly equal in size to fontanelle, slightly paler than head; postclypeus pale 

 yellow-brown, labrum pale yellow; frontal marks pale yellow-brown, flat crescents; antennae 

 yellow. Pronotum pale brown, meso- and metanota pale yellow-brown, transverse sutures 

 virtually absent; femora pale yellow, tibiae and tarsi yellow-white. Abdominal tergites and 

 dorsal stigmata pale brown, sternites and ventral stigmata very pale brown, middles of sternites 

 and cerci pale yellow. 



Posterior margin of head capsule evenly rounded; ocelli and compound eyes both large, and 

 almost touching, maximum separation less than a quarter own least diameter; postclypeus 

 weakly inflated, Pcl/W, 0-23, posterior margin evenly rounded, median suture present in 9. 

 weak in <$. Apical teeth of mandibles short, La/Li, 0-53-0-55, Ra/Ri, 0-75-0-77; subsidiary 

 marginal tooth of left mandible distinctly clear of molar prominence in surface view, complex 

 ratio, L.A/Li.L m , 6-10-6-87; points of apical and marginal teeth of right mandible in line, anterior 

 edge of first marginal longer than that of second. Meso- and metanota moderately wide at 

 constriction, M/W, 0-29-0-33. Pilosity of head capsule very pale brown, an even pelt with 

 scattered emergent setae. 



Measurements (two specimens from one locality) in millimetres. 



Head width across eyes (W) . 0-98-1-04 



Ocellus (O w x Oi) . . . o-u-o-12 x 0-13-0-14 



Ocellus to eye (O-E) . . 0-02-0-03 



Postclypeus length (Pel) . . 0-23-0-24 



