SOUTH AFRICAN TERMITES. 



65 



An analysis of 20 fore and 25 liind wings gave 



Radius Avith four offsets 

 .> ,, five „ 



„ seven „ 

 » „ eight „ 



,, nine 



Fore wings. Hind wings. 



. 1 



. 6 



1 12 

 (•) . 6 

 It . 

 4 . 



Not inf reqnenth- (20 per cent.) the media possesses a sector 

 tliat extends in a straight or sinuous course to the apex of the 

 wing ; when this is present the cubitus is restricted ; when 

 absent, the cubitus is more extended. 



Termes natalensis Hnv. 



The simple radius may exhibit well-defined inner branches 

 or sectors which curve shortly to the apex of the wing. When 

 present the number varies from 1 to 4. 



The pseudo-media may be practically simple, that is, with 

 a furcate tip in the apex of the wing ; more frequently it 

 possesses 1 to 3 strong inner branches which are simple or 

 erratically subdivided. In 18 wings before me, 6 have the 

 pseudo-media with one, 6 two, and 6 three such branches. 

 In 31 wings where the pseudo-media was found more or less 

 branched, the first branch originated before half the length 

 in 8, at half in 18, and beyond half in 5 cases. In one of 

 these wings two branches originated before half the length. 

 The inner margin of this wing is supported by the branches 

 and the subdivisions of the pseudo-media and the offsets of 

 the cubitus. In order to ascertain whether there was any 

 degree of consistency in the number of points at which the 

 margin was so supported, 12 wings were examined with 

 the following result : 



VOL. 4, PART 1, 



