THE SOLDIERLESS TERMITES OE AERICA 181 



Measurements (one specimen) in millimetres. 



Head width (W) 096 



Fore tibia width (T w ) .... 014 



Fore tibia length (Ti) .... 069 



Postclypeus length (Pel) . . . 026 



Left mandible, apical to first marginal (La) 012 



Left mandible, first to third marginal (Li) . 0-16 

 Left mandible, third marginal to molar 



(Lm) 005 



Right mandible, apical to first marginal 



(Ra) on 



Right mandible, first to second marginal 



(Ri) 012 



Right mandible, second marginal to molar 



(R m ) 006 



Comparisons of A. spinulatus have already been made with all the other species 

 apart from A. tranquillus. This is distinguishable in the imago and worker castes 

 by the shorter apical teeth of the mandibles, the longer outer edge of the right 

 first marginal, in the imago by the vestigial third apical spur of the fore tibia, and 

 in the worker by the distinctive enteric valve. 



Holotype queen, paratype nymphs and workers from type-colony, Democratic 

 Republic of Congo: Katanga, Keyberg, near Elizabethville, 21.iv.1948 

 (A. E. Emerson) in American Museum of Natural History. 



The single nest-series is recorded as from a mound about 1 foot high, 14 inches 

 base diameter, of earth-carton with very thick walls, near the top of a rocky hill in 

 savanna woodland. 



Ateuchotermes tranquillus (Silvestri) comb. n. 

 (Text-figs 452, 453, 460, 461, 480 & 481; PI. 4, fig. 5) 



Anoplotermes tranquillus Silvestri, 1914 : 52. LECTOTYPE $, Guinea: Mamou (Silvestri 

 Coll., Istituto di Entomologia Agraria, Naples) here designated [examined]. 



Imago. (Old specimens, colour faded in preservation.) Head capsule sepia-brown, darker 

 above ocelli; fontanelle short oval, flat or slightly depressed, sometimes nearly as large as 

 ocellus, slightly paler than head; medial spot short oval, much smaller than fontanelle, flat or 

 slightly raised, coloured as head; postclypeus, sepia-brown, labrum yellow-brown; frontal 

 marks almost flat, shining crescents, slightly paler than head; antennae pale brown. Pro- 

 notum, meso- and metanota, sepia-brown, transverse dark sutures distinct; femora brown, 

 tibiae and tarsi, pale brown. Abdominal tergites sepia-brown, sternites brown, paler in middle, 

 dorsal and ventral stigmata darker than sclerites; cerci very pale brown. 



Posterior margin of head capsule evenly rounded, ocelli small, separated from compound 

 eyes by nearly one and a half times own least diameter; postclypeus moderately inflated, 

 Pcl/W, 0-29, posterior margin evenly rounded, median suture distinct, apart from anterior 

 one-third. Apical teeth of mandibles short, La/Li, 0-51, Ra/Ri, o-66; subsidiary marginal tooth 

 of left mandible clear of molar prominence in surface view, complex ratio, La/Li. L m , 5-33; 

 points of apical and marginal teeth of right mandible in line, anterior edge of first marginal 



