ioo W. A. SANDS 



and A.M.N.H. (others in Mus. Tervuren.) ; Luluabourg, no date (P. Callewaert), 

 syntype soldiers, type colony, T. carbo (Sjostedt), A.M.N.H. (others in Naturhist. 

 Riksmus., Stockholm.) 



Other Material (additional to that listed in Sands, 1957). Congo : Gihinga, 

 14.vii.1941 (H. Bredo) ; Rwindi River, no date (H. Kirby), A.M.N.H. 



Angola : Sao Paola de Loanda, 22.ii.1913 (F. Silvestri), A.M.N.H. ; 4m. S. of 

 Luanda, 23.vii.1949 (G. R. Gradwell, D. Snow), B.M.(N.H.). 



Kenya : i° 25' S., 35 10' E., to i° 38' S., 35 17' E., ii.1948 (N. A. Weber), 

 A.M.N.H. 



A total of 24 nest series were examined. 



It has been noted (Sands, 1957) that this species tolerates drier conditions than 

 many, and the additional records are from relatively dry areas also. 



The type locality, Luluabourg, is well within the forest-savannah mosaic zone 

 (Keay et at., 1959, type 8) on the southern border of the rain forest, and thus appears 

 to be in more moist conditions, but there are in that area many patches of dry grass 

 steppe on Kalahari sand, and other drier savannah types (Keay et al., 1959, types 

 20 and 24) . T. gratiosus appears to occur in these, though absent from the surround- 

 ing moister savannah woodland, where T. rhodesiensis is the common species. 



Sjostedt (1926) recorded T. carbo from Haut Uele, but this must be a misidentifi- 

 cation since T. gratiosus is an East and Central African species. 



Trinervitermes occidentalis (Sjostedt) 

 (Text-figs. 237-240, 252, 253, 282-289 ; Map 23) 



Eutermes occidentalis Sjostedt, 1904 : 93. Type locality : Portuguese Guinea, Bissau. 



Termes (Eutermes) occidentalis (Sjostedt) Desneux, 1904a : 44. 



Eutermes (Trinervitermes) occidentalis Sjostedt ; Holmgren, 191 2 : 64. 



Trinervitermes occidentalis (Sjostedt) Sjostedt, 1926 : 332. 



Trinervitermes auriterrae Sjostedt, 1926a : 3. Type locality : Ghana, Keta. syn. n. 



Trinervitermes maudanicus Sjostedt, 1926b : 156. Type locality : Congo, Haut Uele, Mauda. 



syn. n. 

 Nasutitermes (Trinervitermes) bettonianus subsp. sulciceps Emerson, 1928 : 493. Type locality : 



Congo, Garamba. syn. n. 

 Nasutitermes (Trinervitermes) lutzi Emerson, 1928 : 494. Type locality : Congo, Niangara. 



s^n. n. 

 Trinervitermes bettonianus subsp. sulciceps (Emerson) Snyder, 1949 : 323. 

 Trinervitermes lutzi (Emerson) Snyder, 1949 : 328. 

 Trinervitermes auriterrae Sjostedt ; Sands, 1957 : I &- 



Imago. Head capsule brown to chestnut brown ; vertex with two or three indistinct diverg- 

 ing yellow-brown patches or streaks, or sometimes one median pale patch, postclypeus, labrum, 

 areas in front of ocelli and small area behind each eye paler yellow-brown to brown. Antennae 

 yellow. Pronotum yellow to yellow-brown, meso- and metanota, other thoracic sclerites and 

 legs yellow. Abdominal tergites brown, darker sepia-brown around stigmata ; sternites pale 

 yellow to yellow-brown, brown around stigmata. Wings translucent pale brown, subcosta and 

 radius sector yellow, the latter outlined sepia-brown at base, fading to yellow-brown distally ; 

 bright orange streak in membrane behind radius sector ; rest of venation brown. 



Posterior margin of head capsule behind eyes much less than semi-circular, slightly sinuate 

 immediately behind eyes ; fontanelle Y-shaped, often slightly depressed posteriorly, length 



