Range 



Mean 



0-68-0-75 



0726 



0-11-0-12 



0118 



0-49-0-51 



0506 



0-19-0-26 



0-2I0 



0-05-0-08 



0069 



012-015 



OI36 



004-005 



OO47 



0-06-0-08 



OO69 



009-013 



OII3 



0-04-0-05 



OO43 



208 W. A. SANDS 



a little over four times as long as width of mesenteron at insertion of malpighian tubules; 

 enteric valve seating weakly three-lobed, third inner lobe smaller than outer two, connected to 

 second pouch of proctodeum by a short neck, lateral in postion in unopened abdomen; internal 

 cushions of enteric valve all retracted with scaly surface only, positions 3 and 4 slightly larger 

 than 1 and 2; membranous wall of valve between and beyond cushions with sparse minute 

 spicules. 



Measurements (five specimens from five localities) in millimetres. 



Head width (W) 



Fore tibia width (T w ) . 

 Fore tibia length (Ti) . 



Postclypeus length (Pel) .... 

 Left mandible, apical to first marginal (La) • 

 Left mandible, first to third marginal (Li) 

 Left mandible, third marginal to molar (L m ) 

 Right mandible, apical to first marginal (Ra) 

 Right mandible, first to second marginal (Ri) 

 Right mandible, second marginal to molar (R m ) 



A . disluctans has already been compared with the species preceding it alphabetic- 

 ally. In the imago caste it is smaller than A. hemerus, and has an evenly rounded 

 postclypeus. A. improcinctus, A. nanus and A. polyscolus are smaller than A. 

 disluctans and A. improelatans has wider meso- and metanotal constrictions, and 

 a vestigial fontanelle. 



In the worker caste, A . hemerus is again larger, A . nanus and A . polyscolus have 

 armed enteric valves, and, like A. improcinctus are also smaller. The latter species 

 has longer mandibular apical teeth, and the fore tibia is somewhat more swollen. 

 In A. improelatans the mixed segment is much shorter and the first marginal tooth 

 of the right mandible is equal to the second. 



The material now included in A . disluctans was at first separated into two species, 

 one from Uganda and the other from Central Africa. However, it has not been 

 found possible to distinguish the two groups of specimens taxonomically and they 

 are therefore described as one. Some doubt remains because of slight differences 

 in the proportionate sizes of certain parts such as the imago antennal articles. For 

 this reason the central African material is deliberately excluded from the paratype 

 series as a tentative identification. 



The abdomen of the worker caste appears to be at least weakly dehiscent in 

 A. disluctans. 



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

 Uganda: Kawanda, 1948 (W. V. Harris, coll. No. 508) in British Museum (Natural 

 History). 



Other paratype material. Uganda: Hoima, 28.viii.1949 (M. Liischer). Demo- 

 cratic Republic of Congo: Near Stanleyville [A. Kohl), both in AMNH. 



Material excluded from type-series. Democratic Republic of Congo: Katanga, 

 Keyberg, 10 km S. of Elizabethville, 10. iv. 1948 {A. Emerson), in AMNH. Zambia: 

 Kitwe (two vials), 25.1.1957 (W. G. H. Coaton) in N.C.I., Pretoria. 



There is no biological information on this species. 



