THE SOLDIERLESS TERMITES OF AFRICA 175 



Antennal article III . . . 004-0-05 



Antennal article IV . . 006 



Antennal article V . . . 006 



Left mandible, apical to first 



marginal (La) • • • 008 



Left mandible, first to third 



marginal (Li) . . . 0-14 



Left mandible, third marginal 



to molar (L m ) . . . 0-08-009 



Right mandible, apical to first 



marginal (Ra) • • • 0-08-0-09 



Right mandible, first to second 



marginal (Ri) ... on 



Right mandible, second marginal 



to molar (K m ) • • • 008 



Mesonotum width (i\l) . . 0-29-0-34 



Metanotum width (X) . . 0-30-0-36 



Worker. Head capsule pale yellow, pilosity yellow, sparse. Postclypeus moderately in- 

 flated, Pcl/W, 0-27. Apical teeth of mandibles short, La/Li, 053, R A /R|, 068; subsidiary 

 marginal tooth of left mandible with proximal end just level with edge of molar prominence in 

 surface view, complex ratio, La/Li. L m> 8-40; point of first marginal tooth of right mandible 

 distinctly behind line of apical to second marginal, anterior edge of first marginal shorter than 

 that of second, R A /R[ Rm, 10-40. Fore tibia scarcely swollen, Ti/T w> 510, third apical spur 

 about one-third length of other two. Mesenteric junction with proctodeum diagonal; enteric 

 valve seating with short neck, dorsolateral in unopened abdomen; enteric valve cushion in 

 position 1 sclerotized throughout its length, half of which protrudes beyond tips of spines of 

 other positions, spines confined to dilated distal end, shaft smooth; spines on rim of dilated 

 end 30-40, in number, middle portion of wider part inflated with a second row of long spines, 

 and scattered long and smaller spines behind them; cushions in other positions with 7-10 

 extremely elongated straight slender spines, each tipped with a completely recurved hook, 

 capable of engaging upon spines of other positions to form a criss-cross network; membranous 

 wall of valve between and beyond cushions without detectable spicules. 



Measurements (one specimen) in millimetres. 



Head width (W) 0-96 



Fore tibia width (T w ) .... 0-14 



Fore tibia length (Ti) .... 0-70 



Postclypeus length (Pel) . . . 0-26 



Left mandible, apical to first marginal (La) 0-08 



Left mandible, first to third marginal (L\) . 015 

 Left mandible, third marginal to molar 



(L m ) 006 



Right mandible, apical to first marginal 



(Ra) 009 



Right mandible, first to second marginal 



(Ri) 013 



Right mandible, second marginal to molar 



(Rm) 006 



Comparisons have already been made between A. retifaciens and the preceding 

 species, A. ctenopher, A. muricatus, A. pectinatus and A. rastratus. It is a distinctive 

 species in the imago in having such large eyes and ocelli ; and in this it differs from 



