ETHIOPIAN NASUTITERMITINAE 13 



Imagos 



Left mandible with apical and first marginal teeth subequal, or apical shorter, left 

 mandible index 0-2-0-6 ; molar plate of right mandible with prominent ridges 

 (Text-figs. 157-196) 2 



Left mandible with apical tooth longer than first marginal, left mandible index 

 09-3-2 ; molar plate of right mandible without ridges, or ridges vestigial in 

 sinning smooth surface (Text-figs. 431-450) ....... 8 



Left mandible with cutting edge between first and third marginals entire, straight or 



at most slightly sinuate .......... 3 



Left mandible with cutting edge between first and third marginals indented in front 



of third marginal. ........... 6 



Right mandible with posterior cutting edge of first marginal equal to or shorter than 

 posterior cutting edge of second marginal ; molar plate with Q-Il regular ridges 



NASUTITERMES (p. 15) 



Right mandible with posterior cutting edge of first marginal longer than posterior 



cutting edge of second marginal ; molar plate with 5-9 irregular ridges . . 4 



Smaller, YV, under 1-28 ; E, under 038 ; T 3 , under 1-63. Right molar plate with 

 indented margin at basal end. Colour very dark brown to pitch black 



RHAD1NOTERMES (p. 71) 



Larger, W, over 1 35 ; E, over 042 ; T 3 , over 1 03 Right molar plate without 

 pronounced irregularity of outline in surface view Colour paler, to sepia brown 

 or dark chestnut brown .......... 5 



1'ilosity of head capsule evenly fine, setae arising from small so, kets ol regular size 



with' a lew larger S0< kets * .it t. -red among them . TRINERVITERMES (p. 76) 



Pilosity of head capsule uneven, sot kets ol setae varying from small to large, the 

 latter numerous and conspicuous .... BAUCALIOTERMES (p. 138) 



Right mandible with molar plate bearing 13-14 ridges and without pronounced 

 irregularity of outline m surface view. Postclypeus weakly inflated, width 3-0 

 times length GRALLA TO TERMES (p. 55) 



Right molar plate with 7 10 ridges, and with indented margin .it basal end. Post 

 clypeus strongly inflated, width 1-7 21 times length ..... 7 



Eyes large compared with head width, \\ E index j 4. Fontanelle slit-like, not 

 distinctly bifurcate anteriorly. Left mandible with subsidiary tooth between 

 third marginal and molar prominence not visible in the gap between them in 

 surface view. Colour pale brown . . LEPTOMYXOTERMES (p 51) 



Eyes smaller compared with head width, \Y E index 32-45. Fontanelle slightly to 

 distinctly bifurcate anteriorly. Left mandible with subsidiary tooth visible in gap 

 between third marginal and molar prominence 111 surface view. Colour dark 

 brown to pitch black FULLERITERMES (p. 55) 



Left mandible with cutting edge between first and third marginals indented in front 



of third, and sinuate ; left mandible index under 14 . . . . . 9 



Left mandible with third marginal absorbed in short cutting edge behind first ; left 



mandible index over 2 o .......... 11 



Very small, YV, 056 or less ; T 3 , 071 or less. Head shining, pilosity reduced to 

 paired prominent setae on vertex, frons and postclypeus. Pronotum, length at 

 least three-quarters width .... AFROSUBULITERMES (p. 153) 



Larger, \V, 0-82-0-99 ; T 3 , over 1 00. Head with scattered fine and longer paired 



setae. Pronotum, length less than three-quarters width . . . . . 10 



Smaller, YV, 0-82 ; E, 0-27 ; T 3 , 100. Pilosity finer, more sparse, surface of head 



shining. Fontanelle a pale streak . . . . VERRUCOSITERMES (p. 156) 



Larger, YV, 0-85-0-99 ; E, 0-29-0-38 ; T 3 , 1 -00-1-20. Pilosity dense, surface of 

 head almost obscured. Fontanelle triangular, dumb-bell-shaped, or nearly 

 obsolete EUTERMELLUS (p. 141) 



