226 W. A. SANDS 



Measurements (two specimens from separate localities) in millimetres. 



Head width (W) .... 0-98-0-99 



Fore tibia width (T w ) . . 0-15-0-16 



Fore tibia length (Ti) . . . 0-76-0-86 



Postclypeus length (Pel) . . . 0-25-0-28 



Left mandible, apical to first marginal 



(L A ) ...... 0-09-0-12 



Left mandible, apical to third mar- 

 ginal (Li) ..... 0-15-0-17 



Left mandible, third marginal to 



molar (Lm) ..... 006— 0-07 



Right mandible, apical to first mar- 

 ginal (R A ) ..... 0-09-0-1 1 



Right mandible, first to second mar- 

 ginal (Ri) ..... 0-11-0-13 



Right mandible, second marginal to 



molar (R m ) ..... 0-06-008 



A . cavator is the more specialized of the two described species, and the third known 

 species is intermediate in form between A . cavator and the type-species of the genus, 

 A . fossor. The longer apical teeth of the mandibles, and the vaned enteric valve 

 armature are characteristic. 



Holotype $ (queen), paratype $ (king) and workers from type-colony, Nigeria: 

 Northern Region, Samaru, near Zaria, xii.1958 (W. A. Sands coll., No. S.2142) in 

 British Museum (Natural History). 



Other paratype material. Nigeria: Northern Region: 30 m. from Lokoja, on 

 Okene Road, 8. hi. 1958, Samaru, 18. v. 1959 (W. A. Sands); Eastern Region, Port 

 Harcourt, 19.x. 1957 (W. Wilkinson). Ivory Coast: Mount Nimba, Yale, 14.iv.1968 

 (G. Josens). Gambia: Nyambai, i6°4o'W., I3°i8'N., 13.ix.1966 and between 

 Sanyang and Gunjur, i6°46'W., i3°i5'N., 16.ix.1966 (W. A. Sands). 



This species was recorded from soil, the foot of trees, and Macrotermes mounds. 



Aderitotermes fossor sp. n. 



(Text -figs 610, 615-618 & 625-630; PL 9, figs 1-4) 



Imago. Head capsule sepia-brown or tinged with reddish towards chestnut-brown, darker 

 above ocelli, dark areas sometimes extending as streaks towards fontanelle ; fontanelle circular, 

 flat, about half as large as ocellus, yellow-white, very conspicuous; medial spot oval, flat, 

 smaller than fontanelle, coloured as head; postclypeus brown, labrum yellow-brown; frontal 

 marks weakly developed flat crescents, coloured as head or slightly paler ; antennae pale yellow- 

 brown. Pronotum sepia-brown, meso- and metanota brown; femora pale yellow-brown, 

 tibiae and tarsi paler. Abdominal tergites brown, dorsal stigmata dark sepia-brown, sternites 

 pale brown, yellow in middle, ventral stigmata brown ; cerci yellow. 



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

 compound eyes by half own least diameter or more ; postclypeus weakly to moderately inflated, 

 Pcl/W, 0-24-0-30, Pc1/Ra, 2-37-3-00, posterior margin evenly rounded, median suture distinct, 

 characters of mandibles and head pilosity given in generic diagnosis. Complex ratio of mandible 

 and notal measurements, Li/M.N, 1-50-2-05. 



