142 W. A. SANDS 



•q6--q8), cutting edge between the latter sinuate and indented in front of third marginal, which 

 is approximately equilateral, small subsidiary tooth just visible in gap between third marginal 

 and molar prominence ; right mandible, apical and first marginal as left, second marginal small 

 but distinct with concave posterior edge, molar plate in surface view without basal indentation, 

 asymmetrical with large posterior rounded flange and smaller anterior, weakly ridged. Post- 

 clypeus inflated, width 1-8-2-5 times length. Fontanelle variable, Y-shaped, triangular, 

 dumb-bell-shaped or near obsolete. Eyes scarcely to distinctly set out from sides of head. 

 Pilosity of head not particularly regular in length, with numbers of conspicuous long setae 

 tending to occur in symmetrical pairs. Pronotum, sides weakly convergent to rounded posterior 

 margin, length approximately two-thirds width. 



Soldier. Monomorphic. Nose conical to cylindrical, tapering to fine point, distinctly rugose. 

 Vestigial mandibles with minute points or without, labrum with tri-lobed anterior margin. 

 Head capsule very weakly to moderately constricted behind antennae. Antennae 13 segmented. 

 Head and nose with scattered fine very short setae, longer at nose tip, and conspicuous longer 

 setae arranged approximately in two rows, one in front and one behind the constriction, front 

 row with 4-10 setae ; posterior row with 2-10. Rest of body with scattered setae of irregular 

 length, longer on posterior margins of tergites and sternites, and towards rear of abdomen, legs 

 with conspicuous long setae, 1 on each coxa, 3-6 on each femur and tibia, among the shorter 

 more typical setae. 



Worker. Mandibles as imago except apical tooth longer in proportion (left mandible index 

 1-24-1-62) and molar areas more pronounced. 



Eutermellus is in many respects the least specialized member of the " Paracorni- 

 termes-bva.nch " occurring in Africa, as shown by the imago and worker mandibles, 

 the typically Y-shaped fontanelle of some species, the tri-lobed soldier labrum and 

 the generally more numerous setae. The soldier mandibles were described in 

 detail in another paper (Sands, 1956). It is distinguishable from Verrucositermes 

 and Afrosubulitermes in the imago by its denser pilosity, and in the latter case 

 by its greater size. The soldier is separated from these two genera both by its 

 general shape and size, and by the numerous prominent setae on head, body, and 

 legs. 



Eutermellus as used here includes three new species and is of interest because the 

 inter-specific variation appears to indicate relationships to other genera. E. 

 undulans has a slender nose in the soldier, combined with an imago in which the eyes 

 are not noticeably set out from the sides of the head capsule, and the posterior margin 

 of the postclypeus is indistinct, merging in profile with the line of the frons. This 

 suggests affinities with Afrosubulitermes and Postsubulitermes. Other species such 

 as E. abruptus and E. bipartitus have the eyes set out from the sides of the head in a 

 similar manner to Verrucositermes and Mimeutermes, whilst in E. convergens and E. 

 aquilinus the more conical nose of the soldier and almost unconstricted head 

 capsule also suggest a relationship to Mimeutermes. These distinctions between 

 the species, though interesting, are not very marked, especially in the soldier castes. 

 Though separable on the basis of the material known at present, from widely spaced 

 localities, it is possible that some of the species named here might be found to be 

 synonymous if further material were to be collected. 



This genus has been recorded from both the Congo and West African rain forests 

 and from the adjacent savannah zones, but not from the savannah south of the 

 Congo nor from East or South Africa. It is found in the mounds of other genera of 

 termites and builds none of its own. 



