THE SOLDIERLESS TERMITES OF AFRICA 109 



mandible level with the edge of the molar prominence, not clear of it. Their uneven 

 head-pilosity coupled with longer apical teeth to the mandibles serve to separate 

 Acholotermes and Amicotermes, since in Astratotermes with uneven pilosity, the teeth 

 are shorter. Astratotermes with an oval fontanelle cannot be separated in the imago 

 by any constant character from Alyscotermes or Astalotermes. However, it is usually 

 possible to locate the correct genus by trial and error among the specific keys and 

 descriptions when this difficulty arises; under the generic heading of Alyscotermes 

 the separate distinctions species by species are given. Astratotermes with a circular 

 fontanelle can be distinguished by its sharp clear outline from Ateuchotermes or 

 Anaorotermes . Finally, Aderitotermes has the ocellus closer to the compound eye 

 and shorter apical mandibular teeth. 



Key to Species 

 Imagos 



1 Compound eyes and ocelli proportionately very large and close together, greatest 



separation between them slightly more than one-third least diameter of ocellus 

 (Text-figs 276-277) ........ pacatus (p. 120) 



- Compound eyes and ocelli smaller and separated by at least two-thirds least diameter 



of ocellus ............. 2 



2 Apical teeth of mandibles longer, L A /L|, 0-67-0-80, R A /Ri, 092-1 07 ... 3 



- Apical teeth of mandibles shorter, L A /Lj, 0-53-0-59, R A /R|, 0-69-0-76 ... 4 



3 Larger, \V, 1-25-1-61. Fontanelle circular, pale and contrasting with head, flat or 



slightly depressed. Meso- and metanota wider at constriction, M/W, 0-32-0-35. 

 Pilosity of head an even pelt ....... prosenus (p. 122) 



- Smaller, W, 1-03-1-06. Fontanelle oval, brown, not contrasting with head, slightly 



raised. Meso- and metanota narrower at constriction. M/W, 0-24-0-28. Pilosity 



of head uneven, not forming pelt ...... hilar us (p. 116) 



4 Smaller, W, 109. Postclypeus less prominently inflated, Pcl/W, 025. Fontanelle 



elongate oval, slightly raised. Ocelli separated from compound eyes by about 

 three-quarters own least diameter, O w /0-E, 1-31 . . . aneristus (p. no) 



- Larger, W, 1-20-1-28. Postclypeus more prominently inflated, Pcl/W, 0-26-0-28. 



Fontanelle circular or short oval, flat or slightly depressed. Ocelli separated from 

 compound eyes by approximately own least diameter, O w /0-E, 0-90-1-08 . . 5 



5 Fontanelle large, circular, flat, distinctly paler than head. Apical tooth of left 



mandible slightly longer, L A /Li.L m , 753 ..... mansuetus (p. 118) 



- Fontanelle small, oval, slightly depressed, scarcely paler than head. Apical tooth 



of left mandible shorter, La/Li. L m , 5-63-6-06 .... apocnetus (p. 113) 



Workers 



1 Apical teeth of mandibles longer, L A /L-, 0-66-0-88, R A /Ri, 0-85-1 • 10 ... 2 



- Apical teeth of mandibles shorter, L A /L|, 0-40-0-58, R A /R], 0-62-0-75 ... 4 



2 Apical teeth of mandibles shorter, L A /Li, o-66, R A /R-, 085. Enteric valve seating 



ventral in unopened abdomen, joined to second pouch of proctodeum by long 

 (length over three times least width) neck. Fore tibia more inflated, Ti/T w , 4-96 



mansuetus (p. 118) 



- Apical teeth of mandibles longer, L A /Li, 0-71-0-88, R A /R-, i-oo-i-io. Enteric 



valve seating ventrolateral or lateral, with shorter neck (length about twice least 

 width or less). Fore tibia less inflated, Ti/T W( 5-06-5-75 ..... 3 



3 Larger, W, 104-109. Postclypeus more inflated, Pcl/Rj, 2-38-2-60. Mesenteric 



junction with proctodeum diagonal, entirely to right of malpighian knot. Enteric 



