SOUTH AKK'IC'AN TKinilTKS. 23 



venation. The use of either "vein" or '* iiervure " inn)lies 

 ;in adherence to one or another school of entoinolog'v ; from 

 this objection tlie more homely rib is tVee. I^nt, in referring- 

 to the several supports of the wing as ribs, one should 

 perhaps apply costation to the assenibhige. It would be 

 capricious, however, to introduce a new term when vena- 

 tion is so generally employed. 



Upon the whole, few new terms have been iniroduced, and 

 then only to meet special cases oi- to a,void prolixity. 

 Generally, terms will be found employed in the broad sense 

 of their common acceptance by entomologists or botanists. 



The generic and family names used are those of Holmgren's 

 classification.^ Unfortunately, the specific name of a termite 

 under reference cannot always be indicated ; such is referred 

 to the genus or subgenus into which it falls in the classification 

 mentioned. This, together with a desire U) avoid a too 

 fretpient repetition of the names of recognisetl species, leads 

 to certain characteristics being described as generic. Jn every 

 case, however, it is to be understood that any such statement 

 does not involve the genus further than those South African 

 species enumerated in the Appendix. 



Sometimes the word " wing " is applied to the developing 

 organ, but, ordinarily, this is spoken of as the " wing-sac." 



Except for those that are obviously diagrannnatic, the 

 illustrations reproduce some of my many camera-lucida 

 sketches, as faithfully as possible, with a none too facile pen. 



It is to be noted, however, that in most cases when the 

 Aving-sac of a more or less mature nymph is treated, the basal 

 connections of the principal trachea^ are simplified. In such 

 wing-sacs, after entering the shoulder and thoracic cavity, 

 these trachea) are profoundly looped; often more so than 

 in figs. 140 and Too (Pis. IX, X). To reproduce them as 

 they are actually arranged woidd give a very imdlved 

 illustration. The loops are, therefore, eliminated and the 

 basal connections shown as they appear in youjig nymphs. 



' Holmgren, Nils. " Tenuitenstudien." parts i. ii. ill; Upsala and 

 Stockholm, liiUD, I'Jll, it»12. 



