THE SOLDIERLESS TERMITES OF AFRICA 115 



than that of second, Ra/RiRiii, 11-91. Fore tibia scarcely inflated, Ti/T w , 4-54, third apical 

 spur about half length of other two but pale, inconspicuous. Mesenteric overlap with procto- 

 deum diagonal or slightly less, to right of malpighian knot; enteric valve seating ventrolateral 

 in unopened abdomen, distinctly three-lobed, third inner lobe slightly smaller, connected to 

 second pouch of proctodeum by distinct neck; membranous wall of valve beyond cushions 

 without detectable spicules. 



Measurements (one specimen )in millimetres. 



Head width (W) 1 00 



Fore tibia width (T w ) . . . 01 6 



Tore tibia length (T|) .... 0-74 



Postclypeus length (Pel) . . . 0-24 



Left mandible, apical to first marginal (L A ) o-io 



Left mandible, first to third marginal (L|) . 0-18 

 Left mandible, third marginal to molar 



(L m ) 006 



Right mandible, apical to first marginal 



(Ra) 010 



Right mandible, first to second marginal 



(Hi) 014 



Right mandible, second marginal to molar 



(Km) 006 



The features distinguishing A . apocnetus from A . aneristus have been given under 

 that species. A. hilarus has a larger fontanelle, shorter postclypeus and longer 

 apical teeth to the mandibles in the imago. The worker also has longer apical teeth 

 and a longer mesenteric proctodeal overlap. In A. mansuetus the fontanelle is 

 large, circular and flat, and the mandibles slightly different in proportions in the 

 imago; the worker has longer apical teeth, and the subsidiary marginal of the left 

 mandible is only just clear of the molar prominence. A. pacattis is distinguishable 

 by the large eyes and ocelli of the imago, and by the slender fore tibia, two-lobed 

 enteric valve-seat, and differently proportioned mandibles of the worker. 

 A . prosenus is larger, with longer apical teeth in both castes. The imago also has 

 a pale fontanelle and even pilosity, and the worker a slender fore tibia. Outside 

 Astratotermes, Astalotermes irrixosus was at first thought to be the same species. 

 However, in the imago, the proportions of mandibular teeth are slightly different, 

 the ocellus is closer to the eye and the meso- and metanota are proportionately 

 slightly wider. In the worker, apart from the unarmed enteric valve, the fore 

 tibia has a vestigial third spur and is distinctly thinner, the mesenteric overlap is 

 longer, and the enteric valve seat dorsolateral. The abdomen of the worker caste 

 is dehiscent in A. apocnetus. 



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

 Kenya: Kisumu, 13.viii.1g40 (E. E. Haviland coll. No. T3) in American Museum 

 of Natural History. (Paratype $ and <$ imago and worker from type-colony also 

 in BMNH.) 



Only the type-series is known, and there is no information on its biology. 



