1 I PIlol'IAN NASUTITERMITINAE 43 



The development of the postmentum setae in the soldier appears to form a dine. They are 

 most numerous in specimens from West Africa, gradually decreasing southwards and eastwards, 

 until in the South-East Congo specimens they are sometimes very sparse. It is necessary where 

 they appear absent to examine numerous specimens, because in most samples, some will usually 

 he found with more than the rest. 



The nanitic soldiers of N. latifrons have been confused with .V. litjae, from which 

 they differ in having no vertex setae, n or 12 segmented antennae, and usually a 

 lew postmentum hairs. A r . schoutedeni resembles the shorter nosed forms in shape, 

 but also has vertex setae, a much more abruptly tapered nose tip, and usually, no 

 postmentum hairs, though one or two may be present very rarely. .V. kempac 

 lacks postmentum hairs, often has vertex setae, and usually a straight or slightly 

 convex profile. N . arborum usually has a straight profile, but also only four main 

 setae at the nose tip, and none on the postmentum surface. 



The imago is distinguishable from most species by its larger size. Differences 

 from N. chrysopleura and N. schoutedeni are discussed under those species. 



Though he described N . latifrons in 1896, Sjostedt (1900) referred further specimens 

 to N. arborum, and was followed in this by Silvestri (1912) and subsequent authors. 

 The result has been that all the references to N. arborum since its original description 

 have in fact been based on specimens of .V. latifrons. This has been discussed under 

 .V. arborum, and the position has been stabilized by the selection of a neotype of 

 the latter. 



One of the syntype specimens of .V. latifrons (Sjostedt) in the Naturhistoriska 

 Riksmuseum, Stockholm, has been selected and labelled as lectotype by Dr. A. E. 

 Emerson. This is as follows : — 



Lectotype : Cameroux : Ekundu, 1891 (Y. Sjostedt, No. <»64), lectotype $ 

 and (J paralectotype (other paralectotype in A.M.N.H.). 



Type Material. CAMEROUN : Ekundu, 1891 (Y. Sjostedt), paralectotype 3* imago 

 N. latifrons (Sjostedt), A.M.X.H. Victoria (BuchoUz), syntype soldier, Trinervitermes 

 pius (Sjostedt), A.M.X.H. (other syntypes in Xaturhist. Riksmus., Stockholm). 



Republic of Congo : Indo, Sibiti, g.ii.1925 [A. Vnsgaard), syntype soldiers, 

 type colony, N. indoensis (Sjostedt) A.M.X.H. (other syntypes in Xaturhist. Riks- 

 mus., Stockholm). 



Congo : Kunungu (H. Schouteden) syntype soldiers, type colony, A', incurvus 

 (Sjostedt), A.M.X.H. (other syntypes in Mus. Tervuren). Haut I'ele, Moto (Bur- 

 geon), syntype soldier, type colony, A', ueleensis (Sjostedt) A.M.X.H. (other syntypes, 

 in Naturhist. Riksmus., Stockholm) ; Bas Uele, Djamba, 17.xii.1924 (H. Schoute- 

 den), syntype soldier, type colony N. expulsus (Sjostedt) A.M.X.H. (other syntypes 

 in Xaturhist. Riksmus., Stockholm). 



Other material. Portuguese Guinea : Cassine, i.ii.1900 (L. Fea), A.M.X.H. 



Guinea : Ximba Mountains, viii.1957, 4 vials (M. Lamotte), Inst. Franc. d'Afr. 

 Xoire, Dakar. 



Sierra Leone : 60m. from Freetown, 24^.1955 (IE. V. Harris). 



Ghana : Aburi, 15.1.1913 (F. Silvestri), A.M.X.H. ; Bobiri Forest, 23m. from 

 Kumasi on Accra Road, 2.ii.ig55 (W. V. Harris), and 21. ii. 1959 (W. A. Sands) ; 



