15 MH. E. J. TlLLYARB t LlFE-SlSTORlES AND 



Five genera are represented, all belonging to the Bracliytron Series. 

 These may, however, be subdivided into two well-marked series, as follows: — 



A. Aphantochrome * Series, in which a scheme of protective colouring is 



developed on the wings and body, agreeing with a marked crepus- 

 cular and shade-loving habit of flight. This colour-scheme consists 

 of a reduction of the body-coloration to a nearly uniform dark 

 brown, with obliteration of all spots on the abdomen ; on the wings, 

 longitudinal brown bands are usually developed. This colour-scheme 

 gives almost complete invisibility to the insect, both in flight and at 

 rest. Genera : Austrophlebia, Telephlebia. 



B. Hyloclirome f Series^ in which a scheme of pale markings on a dark 



ground is developed, agreeing with the forest-haunting habits of the 

 insects. In flight, this coloration appears dark, but does not confer 

 any degree of invisibility ; when the insect is at rest, the colomring 

 is completely protective. 



Genera : Dendroceschna, Austroceschna, NotocBschna. 



III. EcTOGENic Group. A group which has developed its present-day 

 characteristics outside Australia, and is only represented therein by 

 immigrants of comparatively recent date. All three series are repre- 

 sented, each only by a very few forms. Tribe yEscsNiNi. 



A. u^scJma Series. Genus ^^schna. 



B. Anax Series. Genus Anax (including Hemianax). 



C. Gynacantlia Series. Genei'a : Gynacantha, Austrog ynacantJia 



(probably a recent Australian offshoot of Gynacantha), and 

 Ileliceschna. 



This tribe includes three series : — 



A. y^^schna Series, in which the anal triangle of the male is very elongate 



and the membranule correspondingly large ; the larvae without 

 lateral setse on the labium and with no papillae developed on the 

 rectal gills. 



Genera : JBasiceschna, Hoplonceschna, Amphiceschna, CoryphcescJina, 



^scJina, and Anaciceschna (the latter connecting A 



with B) . 



B. Anax Series, in which the anal border of the male is rounded, the 



sectors of the arculus arise near its upper end ; the full-fed larvae 

 without lateral setae, but with papillae on the rectal gills. 



Genus Anax (including Hemianax). 



* Greek a0aj'ros= obscure, invisible ; ;!^pw)ua = colour. f Greek i;\?; = forest. 



