68 CLAUDE FULLEK. 



projects iiiucli further into the lamina than one would expect 

 from the atrophied condition of its pre-existing trachea. 



It will be noticed, figs. 70a and 75 (PI. YI), that the sub- 

 costa is as independent of the radius as is the cubitus, in both 

 wings. Apart from variations tlie wings of Hodotermes do 

 not present many abnormalities, and several hundreds have 

 been examined for the few illustrations here given. In the 

 case of H. viator: (a) two wings were found in which the 

 sub-costa was duplicated, figs. 72a and 72b ; (b) one wing in 

 which it was deeply furcate, fig. 73, a condition that maj' 

 have arisen from a duplication of the pre-existing trachea* ; 

 (c) one wing with the post-costa deeply furcate, fig. 74; 

 (cZ) the sub-costa appeai'ed in a strongly-branched condition, 

 fig. 77, unusual for this species. In the case of H. trans- 

 vaalensis: (a) in one wing there was no pseudo-media, 

 fio-. 75 (PI. VI) ; (b) the pseudo-inedia occurred in a dupli- 

 cated condition, fig. 76. 



My studies of the trachea? of the wing-sac have been 

 practically restricted to H. viator, and then to the organs 

 of almost mature nymphs. The majority of specimens ex- 

 amined conformed with that illustrated, fig. 78 (PI. VII). 

 This shows : (a) the post-costal with an independent basal 

 connection (see also fig. 82 and compare with figs. 80, 81, 83, 

 PI. VI L); (b) a duplicated cubital; (c) the anal attached to 

 the stem of the cubital near the fork of the two cubitals. 

 The anal is generally in this position, but may often have a 

 more independent position, fig. 83, and may be decidedly 

 subdivided as in this particular instance. 



The abnormalities noticed were : (a) in one wing-sac the 

 inner cubital was much reduced, fig. 79 (PI. VII), whilst tlie 

 outer, or pseudo-medial, was strongly developed ; (b) in three 

 wino'-sacs three trachete were attached to the cubital stem 

 (as seen also in Rhinotermes), in one of these the outer of 

 the three was considerably atrophied, but in the others, fig. 

 80, it extended practically to the apex of the wing-sac ; 



(c) in one wing-sac, fig. 81, the post-costal was duplicated; 



(d) in one wing-sac an extra trachea was found entering the 



