68 



W. A. SANDS 



Fulleritermes tenebricus (Silvestri) 

 (Text-figs. 108, 109, 118, 146-153, 178-180, 223, 224 ; Map 17) 



Eutermes tenebricus Silvestri, 1914 : 44. Type locality : Guinea, Kakoulima. 



Eutermes (Coarctotermes) tenebricus Silvestri ; Hegh, 1922 : 469. 



Coarctotermes tenebricus (Silvestri) Sjostedt, 1926 : 355. 



~Nasutiterm.es (Coarctotermes) suffuscus Emerson, 1928 : 496. Type locality : Congo, near 



Yakuluku (4 20' N., 28 50' E.) syn. n. 

 Coarctotermes suffuscus (Emerson) Snyder, 1949 : 311. 



Imago. Head capsule dark sepia brown, slightly paler anteriorly ; pale patches in front of 

 ocelli and paler coronal suture sometimes present ; postclypeus sepia brown, labrum yellow to 

 brown, antennae sepia brown. Pronotum as head capsule, meso- and metanota and other 

 thoracic sclerites sepia brown. Femora of legs sepia brown, tibiae brown with yellow tips, tarsi 

 yellow. Abdominal tergites uniformly sepia brown, sternites paler in mid-line. Wing brown, 

 darker at base, translucent when wet, bluish iridescent when dry, venation outlined sepia brown 

 at base, becoming indistinct distally. 



Posterior margin of head behind eyes almost semi-circular, slightly sinuate immediately 

 behind eyes ; fontanelle elongate Y-shaped, slightly to distinctly paler than head ; eyes 

 angularly ovoid, not prominent, small relative to head width, W/E index 3 -2-3 -6 ; ocelli small, 

 oval, separated from eyes by about 1 J times own least diameter ; postclypeus strongly inflated, 

 width 1 -8-2- 1 times length, anterior margin slightly concave, posterior, regularly convex ; 

 antennae 14 segmented, II, V, and VI subequal, IV slightly shorter than these, III longer, up to 

 twice IV, sometimes partially subdivided ; right mandible with posterior cutting edge of first 

 marginal exposed beyond second, shorter than that of second marginal, molar plate deeply 

 indented near base, with 8 ridges. 



Cerci of $ slightly mamilliform conical shorter to equal in length to width across base. 



Pilosity of vertex, one or two long bristle-like setae and sparsely scattered shorter hair-like 

 setae, with a few more bristle-like setae around eyes and ocelli. (Text-fig. 118.) 



Other characters given in generic diagnosis and discussion. 



Measurements (18 specimens from 6 localities) in millimetres. 



Range 

 Head width across eyes 0-91-1-22 



Greatest diameter of eye 0-29-0-34 



Ocellus . . . 006-009 X o-io-o-i2 



0-10-0-14 

 0-88-1-23 

 0-60-0-88 

 1-25-1-54 

 6-10-9-00 



•11 



Mean 



1 06 



031 



08 x o- 



0-12 

 I-09 



o-75 

 1-41 



7-42 



to dark chestnut 



Ocellus to eye 

 Width of pronotum 

 Length of pronotum 

 Length of hind tibia 

 Length of fore wing 



Soldier. Head capsule ferruginous orange, slightly darker posteriorly 

 brown, nearly black posteriorly, nose ferruginous to pitch black with reddish tip. Pronotum, 

 antennae, and abdominal tergites brown, femora of legs pale brown, tibiae and tarsi yellow. 

 Abdominal sternites yellow-brown. 



Head capsule in plan view strongly constricted behind antennae, posterior margin regularly 

 to somewhat angularly rounded, often sulcate in the middle to varying degree ; nose near 

 cylindrical to moderately conical. In profile dorsal surface of nose straight to well behind 

 antennal socket, or slightly sinuate with small hump at base of nose, with or without slight 

 indentation in front of raised and rounded posterior lobe of head ; nose shorter to slightly longer 

 than rest of head capsule measuring from hind margin of antennal socket, angle of nose cone 

 5-17 degrees ; antennae 13 segmented, II short, IV, V, and VI progressively slightly longer, 

 III longer up to twice II. Head setae confined to 6-8 at nose tip, one bilaterally placed pair on 

 vertex and sometimes another at base of nose. 



