BY R. J. TILLYAllD. 



169 



comparable to M^.g and M^. Bub owing to the altered shape of 

 the wing-area to be supplied, the upper branch A^.j becomes a 

 distally -running branch, while the lower branch A4 becomes a 

 basally-running branch. In the half-grown yEschna-w'uvf the 



Fig.2. 



Fig.l. — uEschna hrevislyla Ramb. Tracheation of a half-grown nyinphal 

 hindwing.(Sydney, N.S.W.; Sept., 1913). 



Fig. 2. — ^Efichna brevisti/la K-amh. , S • Tracheation of nearly full-grown 

 nymphal wings. (Sydney; Sept., 1913). A, forewing; B, hindwing. 



Fig.S.—yEsrJma hrevislyla Rainb.,cJ. Basal portion of imaginal wing- 

 venation. (Sydney; Oct., 1913). 



two branches may be seen in this position, Aj.-j running distally 

 from Ac and giving off in turn A;., Aj and A,, while A4 runs 

 basalwards back from Ac(Fig.l). Later on, owing to the devel- 



