DESCEIPTIONS OF AUSTEALIAN ^SCHNIN^. 21 



group in Antarctica (due to pressure o£ competition with newer forms) and 

 for a subsequent exodus along land-connections to Australia and Chili when 

 the Glacial Period intervened. 



This theory would undoubtedly be strengthened by the discovery of a 

 Tasmanian species. A form that finds the climate of the Blue Mountains 

 suitable should surely also be able to find suitable refuges in Tasmania, if it 

 name that way. No such species is known at present ; but, owing to the 

 small amount of collecting of Odonata carried out there, and also to the 

 extreme difficulty of finding these insects (witness the slow accumulation of 

 records for A. patricia in a locality within easy reach of Sydney), we cannot 

 be sure that one does not exist. Meanwhile, we must regard the evidence 

 for supposition B as insufficient, however tempting and fascinating the 

 hypothesis itself may appear. 



II. ENTOQENIC GROUP. 



Tribe Brackytrini. 

 A. APHANTOCHEOME SERIES. 



Coloration dark brown, with more or less complete suppression of all spots 

 and bands ; wings nearly always marked with dark brown costal or subcostal 

 bands. This colour-scheme gives almost complete invisibility to these insects 

 when at rest. Flight rapid and ghost-like, the colour-scheme giving semi- 

 invisibility. Habits more or less crepuscular. 



Genera : — 



1. Basilar space free, subcosta normal at nodus Actstrophlebia, n. g. 



2. Basilar space reticulated, subcosta prolonged througb nodus 



for one or two cells' distance Telephlebia, Selys. 



Genus 1. AUSTEOPHLEBIA, n. g. 



Neuration very close, with numerous ante- and postnodal cross-veins 

 closely set. Rs strongly forked about midway between nodus and ptero- 

 stigma ; Rspl placed one row of cells below inferior branch of fork. M^ 

 much arched above the superior branch of fork of Rs. Sectors of arculus 

 just fused at bases. Pterostigma well braced. Triangles elongate, six- to 

 nine-celled (Plate 8. fig. 6) ; distal side distinctly bent at join of trigonal 

 supplement {Ts). Mspl long, nearly straight, lying one row of cells below 

 M^ and one row above the continuation of Ts, to which therefore it is not 

 joined. Sc normal at nodus ; basilar space free ; submedian space with five 

 or six cross-veins ; subtriangles with one cross-vein ; hypertrigonal space 

 with seven to ten cross-veins. Anal loop compact, of three to four cells' 

 width. Membranule fairly large, but not reaching downwards along the 



