SOUTH AFRICAN TERMIT[-]S. 101 



Fig. 186. — The post-costal is as in figs. 183 and 187 ; the anal is 

 present but not highly developed. 



Fig. 187. — The post-costal as in figs. 183 and 186; the anal has an 

 independent attachment to the cardinal ; an atrophied trachea (probably 

 the medial) arises from the base of the cubital. 



Microtermes incertus. 



Figs. 188 and 189. — Normal fore wing and hind wing, showing struts 

 between costa and radius. 



Fig. 190. — Normal hind wing, with sector to radius. 



Fig. 191. — Abnormal fore wing, with M. and Ps. M. both present. 



Figs. 192 and 193. — Abnormal fore wings with M. present, i-educed 

 and attached to B. 



Fig. 194. — Abnormal fore wing; Ps. M. attached to R. 



Figs. 195, 196, 197. — The cardinal trachea, with buds of wing-sac 

 tracheae developing. 



Fig. 198. — Wing-sacs of a very young nymph, showing early condition 

 of tracheation. 



Fig. 199. — Wing-sac of a young ny)uph in which were the present 

 Pst. C, Sc, and anal. 



Fig. 200. — Cardinal trachea and bases of principals, showing an extra 

 trachea (an independent medial) in the presence of a duplicated cubital. 



Eutermes (trinervius group). 



Fig. 201. — Normal fore wing. 



Fig. 202. — Abnormal fore wing (the companion of fig. 201) with a 

 duplicated media. 



Fig. 203.— Cardinal and bases of principal tracheae of wing-sac, as 

 seen in young nymphs. 



Fig. 204. — Cardinal and bases of princii^al tracheae of wing-sac, as 

 seen in older nymphs ; M. and Ck. closely ajiplied. 



Microtermes sp. 

 Fig. 205. — The cardinal and bases of principal trachea' of wing-sac ; 

 the I'oot of B. abnormally close to that of M. 



Cubitermes bilobatus. 

 Fig. 206a. — The cardinal with bases of principal trachea; of wing-sac ; 

 the radial bearing (abnormally) a vestigial post-costal. 



Fig. 206b. — An enlarged view of the vestigial post-costal of fig. 206a. 



