148 



W. A. SANDS 



Acholotermes imbellis sp. n. 



(Text-figs 344, 345, 352, 353 & 368-373; PL 3, fig. 4) 



Imago. Head capsule sepia-brown, darker above ocelli; fontanelle vestigial, minute, circular, 

 flat or very slightly depressed and coloured as head; medial spot oval, slightly raised, larger 

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

 marks small, flat, semicircular, sepia-brown; antennae yellow-brown. Pronotum, meso- and 

 metanota brown, transverse dark sutures present; femora yellow-brown, tibiae paler, tarsi 

 yellow. Abdominal tergites brown, dorsal stigmata sepia-brown, sternites yellow-brown, 

 paler in middle, ventral stigmata brown ; cerci yellow. 



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

 pound eyes by less than half own least diameter; postclypeus strongly inflated, Pcl/W, 0-32-0-34, 

 posterior margin bowed, not evenly rounded, median suture present, weak anteriorly. Apical 

 teeth of mandibles long, La/Li, 0-89-0-91, Ra/Ri, 1-13-1-24; subsidiary marginal tooth of left 

 mandible just clear of molar prominence in surface view, complex ratio La/Li. Lm, 12-67-14-22; 

 point of first marginal tooth of left mandible slightly behind line of apical to second marginal, 

 anterior edges of first and second marginals approximately equal. Pilosity of head capsule 

 uneven, not forming a pelt, brown. Meso- and metanota fairly wide at constriction. M/W, 

 0-30-0-31. Fore tibia with third apical spur distinct, about two-thirds length of other two. 



Measurements (two specimens from one locality) in millimetres. 



Head width across eyes (W) 

 Ocellus (O ff x Oi) . 

 Ocellus to eye (O-E) 

 Postclypeus length (Pel) 

 Antennal article III . 

 Antennal article IV 

 Antennal article V . 

 Left mandible, apical to first 



marginal (L A ) 

 Left mandible, first to third 



marginal (Li) 

 Left mandible, third marginal to 



molar (Lm) 

 Right mandible, apical to first 



marginal (Ra) 

 Right mandible, first to second 



marginal (Ri) 

 Right mandible, second marginal 



to molar (R m ) 

 Mesonotum width (M) 

 Metanotum width (N) 



0-97-1-06 

 008-0-09 X 010-011 



004 

 0-31-0-36 

 002-003 

 003-004 



005 



013 



014 



0-06-0-07 



013 



OIO-OII 



0-06-0-07 



0-29-0-33 

 0-30-0-35 



Worker. Head capsule pale yellow, pilosity yellow, rather dense on both head and body. 

 Postclypeus strongly inflated, Pcl/W, 0-33. Apical teeth of mandibles very long, L A /Li, i-oo, 

 Ra/Ri, 1-18; subsidiary marginal tooth of left mandible just clear of molar prominence in surface 

 view, La/Li. L m , 22-89; anterior edges of first and second marginal teeth of right mandible 

 approximately equal, R A /Ri.R m . 23-50. Fore tibia weakly swollen, Ti/T w , 4-27, third apical 

 spur distinct, about half length of other two. Mesenteric junction with proctodeum angled 

 between transverse and diagonal, touching malpighian knot; enteric valve seating lateral 

 in unopened abdomen; internal cushions of enteric valve moderately developed, with scaly 



