BY U. J. TILLYARD, 421 



this connection, I suggest a comparison of the two species, 

 Nanno2^hya{Nannodythemis) dalei and N. austmlis, with Gordule- 

 phya montana and C. pyyimra. Exactly the same forces have been 

 at work on the two species, and the relative states of the triangles 

 and surrounding areas in the two pairs are remarkably similar. 

 But Nannophya has not attained the splendid zig-zag flight of Cor- 

 dulephya, owing to the persistence of the broader anal area of the 

 hindwing. In Nannuphlebia and I'etrathemis, however, the flight 

 is very similar to that of Cordulephya, the basal areas being 

 more reduced. 



As regards Neophya and Austrophya, neither of these can 

 now be claimed as being closely allied to Cordulephya. Aus- 

 trophya is clearly an asthenogenetic member of the Idocor- 

 dulina, possessing all the characeristics of that group. Neo- 

 pliya seems to me much more open to doubt. We should be 

 content to await the discovery of its larva before pronouncing 

 a judgment; but it is quite possible that some other African 

 genus exists, which will connect it to a main group in the 

 same way that H es perocordulia connects Cordulephya to the 

 Eticord^ditia. 



EXPLANATION OF PLATES XI.-XIL 



Plate xi. 



Fit:. 1 —Full-fed uympli of CorduLtphya montana, ii.8p.( x 4). 



Fig. 2. — Labium of .sauie ( x 11). 



Fig 3. — Outline of labium of nymph of Cordulephya pygmo'a Selys ( x 22) 



Fig. 4. — Head of same, nhowiiig labium in position of rest ( x 4). 



Fig. 5. — (jizzard of same, showing chitinous folds with teeth ( x 20). 



Fig. 6. — Ovum of Cordidephya pygmcp.a Selys ( x 45). 



Plate xii. 



Fig. 1. — Cordulephya pyqmaea Selys, $( x 2^). 

 Fig 2. — Cordulephya montana, n.sp.,(3( x2i). 



Fig. 3.— Venation of basal portion of wings of C. pygmoea,^{ x 5). 

 /i^basal tuft of hairs. 



