ETHIOPIAN" NASUTITERMITINAE 147 



Eutermellus aquilinus sp. n. 



(Text-figs. 401, 402, 417-419, 482, 483 ; Map 30) 



Imago. Head capsule sepia brown with paler markings on frons, postclypeus and antennae 

 yellow-brown, labrum yellow. Pronotum brown, meso- and metanota and femora yellow- 

 brown, tibiae and tarsi yellow. Abdominal tergites brown, sternites yellow-brown. Wing 

 membrane translucent very pale brown, venation brown. 



Posterior margin of head capsule behind eyes rounded, more strongly curved towards sides, 

 and turned slightly outwards at eye rim ; fontanelle pale, irregularly bilobed with triangular 

 middle section, lateral arms variable in length and shape, sometimes separated from middle 

 section ; eyes scarcely set out from sides oi he.nl, oval, prominent in proportion to own dia- 

 meter and large relative to head width, W/E index 2-5-2-8 ; ocelli large, oval, separated from 

 eyes by less than one-third own least diameter ; postclypeus strongly inflated, width 1-8-1-9 

 times length, anterior margin straight, posterior, convex, arched in middle, sinuate towards 

 outer corners ; antennae 15 segmented, II, IV, and V subequal, III very small. 



Pilosity of head rather even and dense but not sufficiently so to form a " pelt " or " mat ", 

 pronotum and abdominal pilosity similar, longer setae towards margins of sclerites 



Measurements (8 specimens from 2 localities) in millimetres. 



Range Mean 



Head width across eyes 0-93-0-99 . . 094 



036 



010 x 015 

 002 

 074 



o-53 



1 -i 2 

 812 



w to orange, rest of body cuticle 



Greatest diameter of eye 0-34-0-38 



Ocellus . . . 010-011 x 014-016 



Ocellus to eye . . 0-02-0-03 



Width of pronotum . 0-71-0-78 



Length of pronotum . 0-50-0-56 



Length of hind tibia . 1-08-1-20 



Length of fore wing . 7-60-8-60 



Soldier. Head capsule pale yellow to yellow, nose orange-yellc 

 pale yellow. 



Head capsule in plan view scarcely constricted behind antennae, posterior margin somewhat 

 angularly rounded, nose rather thick, weakly conical. In profile almost straight or slightly 

 convex, sometimes weakly humped at base of nose ; antennae, II, III, and V subequal, IV 

 shorter. Conspicuous setae of head consist of six in three pairs arranged approximately in line 

 across base of nose in front of " constriction " and one or two pairs on vertex behind constriction. 

 Measurements (8 specimens from 2 localities) in millimetres. 



Range Mean 



Head length to tip of nose . 1-28-1-38 . . . . 1-32 



Head width .... 0-60-0-65 ■ • ■ • 062 



Depth of head capsule . . 0-39-0-45 . . . . 0-41 



Width of pronotum . . 035 



Length of pronotum . . 013 



Length of hind tibia . . 0-68-0-70 .... 0-70 



E. aquilinus is separable from E. bipartitus in the imago by the larger size, 

 differently shaped fontanelle, more inflated postclypeus, and by the eyes being less 

 distinctly set out from the sides of the head. The soldiers have, however, been 

 found indistinguishable, and in this case the distribution is the only criterion. In 

 the imago caste of the other species, E. convergens has the ocelli more distant from 

 the eyes, a less inflated postclypeus, and a differently shaped fontanelle, E. undulans 

 is smaller, with almost obsolete fontanelle and a differently shaped head capsule, 

 and E. abruptus has smaller ocelli, more distant from the eyes, and a different 

 fontanelle. The soldiers are all very much alike, but the remaining species all have 



