8 4 



W. A. SANDS 



Trinervitermes bettonianus (Sjostedt) 

 (Text-figs. 188-190, 227, 228, 243-245, 256-261 ; Map 29) 



19. Type locality : Kenya, Athi River. 

 Type locality : Tanganyika, Boma ngombe, Kiliman- 



Tanganyika, Amani. 



Mozambique, Zambesi, Villa Pontes. 



492. 



Eutermes bettonianus Sjostedt, 1905 

 Eutermes segelli Sjostedt, 1907a : 26 



jaro area. 

 Eutermes (Trinervitermes) bettonianus Sjostedt ; Holmgren 1912 : 64. 

 Eutermes (Trinervitermes) segelli Sjostedt ; Holmgren 1913 : 348. 

 Eutermes (Trinervitermes) ruficeps Holmgren, 1913 : 343. Type locality 



syn. n. 

 Eutermes crassinasus Sjostedt, 1914 : 6. Type locality 



syn. n. 

 Trinervitermes bettonianus (Sjostedt) Sjostedt, 1926 : 332. 

 Trinervitermes segelli (Sjostedt) Sjostedt, 1926 : 326. 

 Trinervitermes crassinasus (Sjostedt) Sjostedt, 1926 : 326. 

 Trinervitermes ruficeps (Holmgren) Sjostedt, 1926 : 327. 

 Nasutitermes (Trinervitermes) bettonianus (Sjostedt) Emerson, 1928 

 Trinervitermes bettonianus (Sjostedt) ; Snyder, 1949 : 323. 

 Trinervitermes crassinasus (Sjostedt) ; Sands, 1957 : 2I - 



Imago. Some additions to the previous description (Sands, 1957) are necessary. Eyes 

 medium sized relative to head width, W/E index 2-9-3-4 > ocelli separated from eye by one- 

 eighth to one-third own least diameter ; postclypeus width 2 0-2 -5 times length ; molar plate 

 of right mandible with 5-6 ridges, posterior ridges somewhat atrophied. 



Pale coloured " scent " gland on anterior margin of fifth abdominal sternite of $ very large, 

 1 -07-1 -33mm. wide, 0'28-o-5imm. long ; cerci of $ slightly shorter to slightly longer than width 

 across base, conical or slightly mamilliform. Pilosity of vertex uneven, not forming a 

 " pelt " or " mat ". 



Measurements (34 specimens from 13 localities) in millimetres. 



Range 

 Head width across eyes 1 -55-1 -82 



Greatest diameter of eye 0-47-0-59 



Ocellus . . . 0-20-0-24 x 0-22-0-31 



Ocellus to eye 

 Width of pronotum 

 Length of pronotum 

 Length of hind tibia 

 Length of fore wing 



Mean 

 i-68 



o-53 

 •21 x o 

 004 



i-57 



1 03 



213 



17-95 



26 



0-03-0-06 



1 -39-i '85 

 0-88-1-22 

 1-98-2-43 

 14-2-22-3 



Soldiers. The range of variation now includes the more rounded head capsule in plan view 

 previously ascribed to T. crassinasus. Antennae 12-13 segmented, 4 out of 5 with 12. 



Measurements (Major soldier, 119 specimens from 35 localities ; minor soldier, 40 specimens 

 from 25 localities) in millimetres. 



Range Mean 



1-93-2-49 . . . . 2-21 



Major Soldiers 



Head length to tip of nose 

 Width of head 

 Depth of head 

 Width of pronotum 

 Length of pronotum 

 Length of hind tibia 



Minor Soldiers 



Head length to tip of nose 

 Width of head 

 Depth of head 



0-97-1-43 

 0-72-1-07 

 0-54-0-72 

 0-22-0-32 

 i-n-i-57 



Range 

 1-33-1-82 

 0-57-0-93 

 0-43-0-70 



120 

 0-90 

 063 

 0-27 



i-34 

 Mean 

 1-58 

 075 

 o-57 



