20 Or-AUHE FULLER. 



PAGE 



IX. Speciat, Wing Studies .... C? 



(a) Hndotevmes spp. . . . 07 



(h) Calotpviues ilnvhn noiisis Havihind . (.19 



(c) Cryptotermes t^p. . . . 7-1 



{d) Rhinotennes putoi-iu^? Sjo.^feilt . .77 



(e) Psammoternies allocerns S/lvt^stri 79 



(/) Teriues natalensis HavilKiid . . SO 



(fl) Microterin es iiicertus (Hdi-iland) . .S2 



(70 Miscelliiiioous Species . . . S-t 



Appendix ...... s.") 



Explanation of Plates .... ss 



KEVTEW. 



Hertatx rosults of this investigfition ap^ieav to bo at 

 vnriaiioo with nsnnlly accepted views on winw-yonntioii, mid 

 i'or the sake of clearness the main features of the present 

 ]inper are briefly summarised in the foUowino- paragraphs : 



(1) 'V\\Q series of ribs supporting the termite wing's are 

 derived from tliickenings of tlio celhdar tissue of the develop- 

 ing- organ. 



(2) One of these thickenings is in the form of an andiiont, 

 and develops independently ai'ound the margin, whilst the 

 rest form about trachere. Subsequently, that portion of the 

 ambient thickening which extends along the outer margiu is 

 converted into the rib costa. 



(3) The ontogeny of the trachere in a termite wing-sac 

 does not support the generalised scheme of Comstock and 

 Needham, in which all the trachete spring from an anterior 

 and ]iosterior trachea arising respectively from the dorsal 

 and ventral longitudinal trachea? of the thorax. 



(4) The tracheae of the wing-sac develop from two or from 

 thi'ee buds forming very early in nyin]ihal life upon 

 (nich of the four sections of the spiracular trunk trachea* 

 within the lueso- and nietathorax and not upon the dorsal 

 and ventral longitudinal trunks. 



(5) The position and branching of the longitudinal ribs of 

 the wing are almost wholly dependent upon the position and 



