SOUTH Arilli'AN 'I'KK'MITKS. 69 



whig-sac and clo.sel\' applied to tlie i';i(li:il iiJcjng a ])art of the 

 length of the latter, tig. 82 ; imfortiiiiately the basal connec- 

 tions of the tvachea3 were broken, niid rhe fio-itri^ i'('])resent.s 

 nil that could be made out. 



IXb. CaLOTKIOIKS Df in5A\ ion S I S }J(ir/hlll>l.^ 



Plates VlJl-IX, tio-s. 38-l;M.. 



Altogether between 400 and 500 wings of this insect and 

 tpiite 100 wing-sacs in vai'ious. stages of developnu'ut have 

 been examined. The Aving examinations shoAv that, apart 

 from those almost individual peculiarities previously grouped 

 as variations (Section VIII) about sixteen wings in each 

 hundred exhibit a more or less abnormal venation. It may 

 be gathered that a marked variation is characteristic of the 

 species, and not of individual colonies, from the fact that 

 such obtains in five colonies from distiuct centres, although 

 the bulk of the total cited was nuide u\) of 227 wings 

 from one colony and lO.") from one anothei". 



In the tracheation of the wing-sac and in the venation 

 of the Aving this Calotermes differs fundamentally from 

 Hodotermes. In the wing-sac the medial is always present, 

 and normally the cubital is not duplicated. In the wings, 

 the two most striking differences lie (i) in the absence of 

 sector branches from the radius of Calotermes; (ii) in the 

 seeming absence of tlie ])ost-costa from the hind wing, a rib 

 that is strongly defined in the hind wing of Hodotermes 

 (compare fig. 8Q with figs. 84b, c, d, PI. VII). Otlier differ- 

 ences are : (a) the position of the median rib ; this, as the 

 true media in Calotermes, extends to the apex of the wing 

 and is sub-parallel to both radius and cubitus ; (b) tlie presence 

 of a series of cross-ribs connecting the radius and media ; 

 these do not occur, as between pseudo-media and radius, in 

 Hodotermes; (c) the noticeable fusing of the media with 

 the cubitus of the fore wing, fig. 80 (]^1. VII), outside the line 

 of fracture. 



' For the determination of this tennite see Appendix. 



