BY R. J. TILLYARD. 241 



These movements do not amount to so decided a courtship (as far 

 as I could judge) as in the case of Hemiphlebia mirdbilis* , but are 

 of an exactly similar nature, so that it is interesting to find two 

 similar developments brought about by the same necessity, on two 

 insects so differently coloured, and of so different a habitat. 



This species is easily distinguished from S. weyersi Selys, the 

 only other known member of the genus, both by its peculiar 

 colouration, and by its remarkable appendages. 



EXPLANATION OF PLATE XV. 



Fig. 1. — Psevdocordtdia elliptica, n.sp., <$ , appendages, dorsal view ( x 12). 

 Fig. 2. — Pseudocordulia elliptica, n.sp., 6 , appendages, lateral view ( x 12). 

 Fig. 3. — Austrogomphus angeli, n.sp., £ , appendages, dorsal view ( x 9). 

 Fig.4. — Austrogomphus angeli, n.sp., £ , appendages, lateral view ( x 9). 

 Fig. 5. — Austrogomphus avgeli, n.sp., £ , lateral view of 2nd segment ( x 5). 

 Fig. 6. — Austrogomphus angeli, n.sp., 9 , occiput, showing hooks ( x 12). 

 Fig. 7. — Austrogomphus angeli, n.sp., <£ , thoracic colour-pattern ( x 5). 

 Fig. 8. — Argiolates chryso'idts, n.sp., £ , appendages, dorsal view, right half 



(xl8). 

 Fig. 9. — Argioltstts chry^o'ides, n.sp., $ , appendages, lateral view ( x 18). 

 Fig. 10. — Synlestes albicauda, n.sp., £ , appendages, dorsal view ( x 18). 

 Fig. 11. — Synlestes albicauda, n.sp., S , appendages, lateral view ( x 18). 



These Proceedings, 1912, xxxvii., p.463. 



