72 W. A. SANDS 



unworn specimens has been completely absorbed in the cutting edge joining it to the 

 first marginal. The fontanelle is a rounded equilateral triangle with long side arms. 

 It is a very much larger insect, having a head width across eyes of approximately 

 2mm., and much more prominent eyes and ocelli. The posterior margin of the 

 pronotum is deeply indented. In its general appearance and superficially in its 

 ecology, R. coarctatus closely resembles the genus Fulleritermes Coaton, 1962 : 

 15 1-4 from which it has recently been separated on the basis of the presence in the 

 latter of a notch in the cutting edge in front of the third marginal tooth of the left 

 mandible. This is discussed further under that genus. Other differences such as 

 the greater proportionate length of this cutting edge and also that of the right first 

 marginal in Rhadinotermes , and the much less prominent molar regions indicate that 

 this genus is probably adapted to a somewhat different ecological niche, especially 

 since it has been recorded from the same localities as members of Fulleritermes. 



It is convenient to include R. coarctatus in the keys to Fulleritermes. The account 

 of distribution follows the specific description. 



Rhadinotermes coarctatus (Sjostedt) comb. n. 

 (Text-figs. 112, 113, 117, 154-156, 181-183, 225, 226 ; Map 18) 



Eutermes coarctatus Sjostedt, 1092a : 304. Type locality : Nyasaland, Zomba. 



Eutermes {Coarctotevm.es) coarctatus Sjostedt ; Holmgren, 1912 : 65. 



Coarctatotermes coarctatus (Sjostedt) Fuller 1922 : 118. [Unjustified emendation of generic 



name.] 

 Coarctotermes coarctatus (Sjostedt) Sjostedt, 1926 : 355. 

 Coarctotermes coarctatus (Sjostedt) ; Sands, 1957 : 14. 



Imago. Head capsule very dark brown to pitch black, postclypeus and antennae dark sepia 

 brown. Labrum sepia brown, shading to yellow at tip. Pronotum as head capsule, meso- and 

 metanota, pleural and ventral thoracic sclerites dark sepia brown. Legs dark sepia brown apart 

 from paler tips of tibiae and yellow tarsi. Abdominal tergites dark sepia brown, outer ends 

 paler, sternites sepia brown, pale brown in mid-line. Wings translucent pale brown, venation 

 yellow-brown, radius sector with brown streak along posterior margin. 



Posterior margin of head almost semi-circular behind eyes ; eyes not prominent, small relative 

 to head width W/E index 3 - 4 - 3'8, somewhat angularly ovoid ; ocelli small, oval, separated 

 from eyes by about i|- times owm least diameter ; postclypeus strongly inflated, width 2-2 

 times length, anterior margin slightly concave, posterior, indistinct, convex ; antennae 15 

 segmented, II, IV, and V subequal in length, II thinner, III longer than these. 



Cerci of 2 shorter than width across base, mamilliform. 



Pilosity of vertex scattered rather long yellow bristle-like setae rest of body with pale yellow 

 hair- and bristle-like setae. Other characteristics described in generic diagnosis. 



Measurements of 8 specimens from 3 localities were given in an earlier paper (Sands, 1957), 

 these being all the material known apart from one nest series described by Fuller (1922) and 

 falling within this size range. 



Soldier. Head capsule sepia brown to pitch black, nose pitch black with reddish tip. 

 Pronotum, antennae and abdominal tergites sepia brown. Legs, femora brown, tibiae and tarsi 

 yellow to pale brown. Abdominal sternites yellow-brown to brown. 



Head profile raised and rounded behind constriction, more or less straight in front. Nose 

 equal in length or shorter than rest of head capsule, measuring from hind margin of antennal 



