4 2 



W. A. SANDS 



Posterior margin of head behind eyes regularly rounded but less than semi-circular ; fon- 

 tanelle not conspicuous, variable, from Y-shaped and slightly paler than head capsule, to almost 

 obsolete, or even slightly darker than head ; eyes nearly circular, moderately prominent to 

 prominent in proportion to own diameter, but not large relative to head width, W/E index 

 2-9-3-4 >' ocelli medium sized, separated from eyes by two-thirds to distinctly more than own 

 least diameter, oval ; postclypeus weakly inflated, width 3-3-4-2 times length, anterior margin 

 slightly concave or weakly sinuate, posterior margin convex, obtusely angular in middle, near 

 straight or slightly curved to outer corners ; antennae 15 segmented, II and IV subequal, 

 slightly longer than III and V which are also subequal. 



Cerci of $ somewhat mamilliform conical, shorter than broad at base. 

 Measurements (25 specimens from 7 localities) in millimetres. 



Range Mean 



Head width across eyes 1-43-1-70 . . 1-54 



Greatest diameter of eye 0-44-0-55 . . 049 



Ocellus . . . 0-11-0-15 X 0-13-0-21 . . 013 x 0-18 



Ocellus to eye . . 0-08-0-13 ■ ■ o-io 



Width of pronotum . 1-18-1-43 . . 1-32 



Length of pronotum . 0-70-0-88 . . 0-79 



Length of hind tibia . 1-75-2-13 . . 1-93 



Length of fore wing . 11-40-13-10 . . 1232 



Soldier. Head capsule orange-yellow to ferruginous orange, nose ferruginous orange to 

 chestnut brown. Pronotum and antennae as head capsule. Abdominal tergites and femora of 

 legs yellow, abdominal sternites, tibiae and tarsi pale yellow. 



Head capsule in plan view varies with size : smaller specimens oval, tapering towards front, 

 medium sized, near circular, largest, wider than length to base of nose, often indented in mid 

 line at back of head, and sometimes with small projection on each side of base of nose ; nose 

 weakly to moderately conical. In profile distinctly concave, with back of head raised and 

 rounded, except in smallest specimens, often somewhat sinuate with slight hump at base of nose ; 

 nose distinctly shorter to distinctly longer than rest of head capsule, measuring from hind 

 margin of antennal socket, often within one colony, angle of nose cone 5-17 degrees ; post- 

 mentum slightly convex ; antennae 12-14 segmented, usually 13, proportions vary with size, 

 III long, up to twice II, IV and V subequal, slightly longer than II. Head setae confined to the 

 hairy nose tip and scattered over entire surface of postmentum ; dorsal surface of head capsule 

 without prominent setae. 



Abdominal tergites with scattered minute setae, and longer setae on posterior margins of last 

 three or four segments ; sternites with scattered shorter setae, and long setae on posterior 

 margins. 



Measurements (144 specimens from 35 localities) in millimetres. 



Range Mean 



Head length to tip of nose 

 Head width . 

 Depth of head capsule 

 Width of pronotum 

 Length of pronotum 

 Length of hind tibia 







I 



93 







I 



07 











76 











50 











21 







I 



26 



I -40-2-11 

 073-1 35 



0-53-0-95 

 0-38-0-65 

 0-13-0-38 



0-93-I73 



Variation. Imagos from the eastern end of the range tend to be slightly larger, and to have 

 a slightly paler postclypeus than those from the west coast of Africa, as in certain other species. 



The soldiers are more variable than in any other species in size, and in the shape of both 

 profile and plan views of the head. The smallest specimens included in the above range of 

 measurements are somewhat nanitic, but even in the more mature colonies the smaller soldiers 

 may be only 1-5501111. long. The nanitic soldiers have a much less concave profile, with the 

 vertex rather abruptly raised. In mature colonies soldiers apparently derived from more than 

 one instar occur, suggesting a residual or rudimentary polymorphism, as in some other species. 



