The Termites of South Africa 75 



ially as between nest series, and sometimes it is almost obliterated. 

 When well expressed and when illuminated from the side, the 

 sculpturing imitates that of bellicosus. The design may be then 

 summarized as follows: The clypeus is somewhat flat and 

 marked with transverse wrinkles, behind it lies a flatly convex 

 median elevation which reaches about half way to the fontanelle; 

 on each side of this are shallow hollows and in the hinder 

 portion of each hollow lies a smdl sub-circular flat mound. In 

 front of the fontanelle is a flattened diamond-shaped area and 

 this is sometimes bisected by a very faint, linear carina which 

 extends forward from fontanelle to the median elevation. 



The typical imago of M. natalemis is brown to black, the 

 paler parts yellowish or yellowish brovm, without the warmer 

 chestnut brown generally to be noticed in those of bellicosus, 

 (fresh and alcoholic specimens). The following measurements 

 may be taken as applying to M. natalensis s.lat. 



Head, across eyes 3:4 to 3*7 (typical 3-6 to 3- 7) 



Body, with head extended 18 to 22 (typical 19 to 20). 

 Forewing, without stump 31-5 to 40 (typical 35 to 36) 



Span 68 to 85 (typical 75 to 79). 



With regard to the lowest wing-measurements it may be said 

 that they are unusual and were taken from a series of fully 

 chitinized males and females obtained by my friend the late 

 Albert Kelly, F.E.S., from a nest in the Campus of the Natal 

 University College, Pietermaritzburg, in December 1915. The 

 imagos from the nest in question are separable at a glance into 

 two series of longer and shorter winged individuals, the bodies 

 being of equal size. The measurements given below were taken 

 from three males and three females of the shorter-winged series 

 and four males and three females of the longer. 



Shorter series: Forewings, 31-5 to 33* 0; Span, 68 to 72. 



Longer series: Forewing, 35 • to 36-5; Span, 76 to 79*- 5. 



Generally speaking the wing-spans from all Natal localities 

 (68 to 78) except Inchanga (78 to 81) are shorter than are 

 those from the higher parts of the Transvaal (75 to 85). In 

 the Transvaal those from the highest points (Johannesburg 5,700 

 ft.; Witbank 5,300 ft.) are longer than those from contiguous 



