SOUTH AFRICAN TERMITES. 89 



Fig. 18. — Ventral parts of tlie body system, showing the spiracular 

 trunks, the leg trachea', and. in solid black, the ten ventral commissures, 

 and the cervical commissure which links up the trachea; of the first pair 

 of legs. 



Fig. 14. — The great U-shaped trachea of the head (including 

 spiracles I) with the bases of the trachea; attached to it ; /./.. of first 

 legs ; )n:m.. of mouth parts ; x.x.. of the great dorsal trachea; : z.z.. of 

 commissures to dorsal trachea'. (Diagram.) 



Fig. 15. — The frame of the tracheal system of the head, including 

 spiracles I, and showing the U-shaped trachea;; x.x., the paired dorsals 

 terminating at y.y. in the tips of the antenna;; and z.z.. the vertical 

 commissures. (Diagram.) 



Fig. 16. — The tracheae of the first pair of legs, including spiracles I 

 and showing c.c. the cervical commissure. 



Fig. 17.— The upper region of the respiratoiy system of the head 

 including a part of the U-shaped trachea ; a.a., the ti-achese of the dorso- 

 lateral extensions of the prothorax; b.b.. the coimections of the dorsal 

 longitudinal trunks with the great dorsal trachea; of the head ; c.c, the 

 ti-achea; of the gena; ; d.d., the trachea; of the vertex ; e.e., the complexi of 

 t he f rons . ( D i a g i- a m . j 



Figs. 18 and 19 show the tracheal system of the head, and were designed 

 from a series of camera lucida sketches of cleared prej^arations of the 

 newly-hatched young of Odoutotermes latericius. The vai'ious 

 trachea; may be recognised by comparison of these figui-es with figs. 14^ 

 15, 17. 



Fig. 18. — From below, the nearer or more ventral trachea; are shown 

 in solid lilack, the further or more dorsal are shaded. The parts and 

 organs of the head are faintly outlined. 



Fig. 19. — From the side (partly from below), showing, in chief, the 

 nearer half of the system ; also, the tracheae of the first legs, part of the 

 first ventral commissure, the Y-shaped trachea of the nearer meso- 

 thoracic leg. a part of the dorsal longitudinal trunk, and the first 

 palisade trachea of the thorax. 



PLATE IV. 



Fig. 20a. — Diagrammatic representations ot the tracheal system as- 

 seen in the newly-hatched young of T. natalen sis, Odontotermes 

 latericius. and Microtermes incertus. On the left, as looked 

 through from above ; on the right, as seen when the dorsal longitudinal 

 trunk is thi'own aside. 



Fig. 20b. — The main system as seen from the side in the cleared 

 preparation of the newly-hatched young of T. natalensis. 



