SOL'Tll AFRICAN 'I'l-IHMITES. 99 



Fig. 144. — Normal foro wing ; Ca. strons^ly developed, with ontei* 

 branches to B. 



Fig. 145.^ — Normal hind winy, with independent ril) from apex, prob- 

 ably a disconnected sector-like brancli of M. ; the tip of the medial 

 trachea probably left the radial as in fig. 139c, giving rise to the short 

 inner branch of R. 



Fig. 146. — Normal hind wing ; sector-like branch of 31. subdivided ; 

 two offsets of Cit. incurved. 



Fig. 147. — Normal fore wing; Ca. strongly developed, ]mt on lines 

 quite different from those in fig. 144. 



Fig. 148.— Abnormal hind wing ; M. not attached to B. ; with an extra 

 rib applied, in part, to M. 



Fig. 149. — Abnormal hind wing,- probably due to a duplication of the 

 cubital trachea. 



Fig. 150. — Abnormal hind wing; M. duplicated; M. not attached 

 toi2. 



Fig. 151. ^Abnormal hind wing ; extra rib furcate and clearly defined. 



Fig. 152. — Abnormal hind wing ; M. attached at base to Cu. instead 

 of to B., with two well-defined, independent ribs between offsets of Cu. 



Fig. 153. — Cardinal and bases of wing- sac tracheaa, naturally arranged, 

 showing an extra trachea on the liase of the radial, which assumes the 

 role of an anal after applying itself to the cubital. 



Fig. 154. — Illustrating an abnormal development of the tracheae of 

 the wing-sac ; the medial with (1) a well-developed branch crossing the 

 cubital; (2) a branch crossing the radial ; (3) a well-developed inner 

 branch. 



Rhinoterme s putorius. 



Figs. 155 and 156. — Rhinotermes putoriiis; fig. 155, fore wing; 

 fig. 156, hind wing. 



Figs. 157 and 158. — R. putorius; wing-stump and base of lamina;, 

 fig. 157, fore wing ; fig. 158, hind wing. 



Fig. 159. — R. putorius ; wing-sacs of very young nymph, illustrating 

 the development of the tracheas. 



Figs. 160 to 163. — R. putorius; the trachea of four wing-sacs of 

 one very young nymph, showing four sufficiently different developments. 



Fig. 164. — R. putorius; the normal tracheation of the wing-sac of 

 a nearly matui-e nymph. 



Fig. 165. — R. putorius; the abnormal tracheation of the wing-sac 

 of a nearly mature nymph, exhibiting an extra principal trachea. 



7* 



