SOIT'I'II AFRICAN 'I'KimiTKS. 



29 



TV, TVn. ^fodia. — This tcDii is njiplicd, cnnsfM-vntivoly, to 

 the vib wliicli succeeds an indeyieudciit mcdiid triicliea. 



V, Va. — Cubitus. — '^Pliis is tlie cul)itus or sub-media of 

 g'eneral acceptance. It corresponds \vit]i tlu^ ])ranclied Cii. 1 

 of tlie cockroach. Tn tlie wiuo-s of cci'tain species it is 

 duplicated, and then the anteinor stem (V'a) precedes ;i sul)- 

 median rib, which will be called the ps(Mido-media , as in 

 certain respects it imitates a true media. 



VI, Via. Anal. — The anal of o-enernl accejitance. 

 Hitherto, the names given to the principal ribs of the 



termite wing- have not been based u]iou ontogenetic con- 

 siderations, and this will ex]ilaiii the decided differences in 

 the accomjianying table, into which CNimstock and Needham's 

 jiomenclature has been introduced for purpose of comparison. 



Nomenclatures: Table of Comparison 



Hageu mill 

 Sjosteilt. 



Costa 



I 

 Sub-costa 



) 



Media 

 Media 



Sub-media 

 Anal 



'^^rhe earliest of these nomenclatures was probably that of 

 Hagen, and it seems to rest upon the condition of the more 

 specialised wing. 



A decided improvement in naming the wing-ribs was intro- 

 duced by Desneux. He did not recognise Hagen's sub-costa 

 as such but as the radius; and he called the first auxiliarv 

 " sub-costa " and the second auxiliary, " the principal branch 

 of the radius," or R. 1. 



My own studies of the final tracheal arrangement in 

 Hodotermes, Calotermes, and Cryptotermes led me 



