DESCRIPTIONS OF AUSTRALIAN ^SCHNIN^. 11 



Tribe II. Bbacsytbini. 



Ms symmetrically forked, or nnforked. Rsj^^ straight and lying only one 

 or two cells' width below Ms. Mspl similarly developed with respect to il/j. 

 Oblique vein very close to subnodus. Eyes touching for a long distance. 

 Inferior anal appendage of male sim.ple. 



Larva with elongate abdomen, rounded above, flattish beneath. Head and 

 eyes of moderate size only. Labium with apex of lateral lobe either 

 rounded, pointed, or slightly nodding, but tiot squarely truncated. Superior 

 appendage either very short, or long and sharply pointed. 



This tribe includes two series : — 



A. Boyeria Series, with Ms unforked ; genera Allojjetalia, Gompho'schna, 

 Jagoria, LincescJuia, Boyeria. 



B. BracJiytron Series, with Ms symmetrically forked : genera Telephlehia, 

 Austropldebia, n. g., Bendroceschna, n. g., AustrocescJina, Notocesclina, n. g., 

 Calia'scJina, Periceschna, Nasiceschna, Epla'sdma, ^Eschnophlehia, and 

 Brachytron. 



Tribe III. ^'Bscrnini. 



Ms unsymmetrically forked, or unforked. Ms'pl much curved concavely 

 to Ms and separated from it by three or more cell-rows. Mspl similarly 

 developed with respect to M^. Oblique vein very close to subnodus. Eyes 

 and inferior appendage of male as in II. 



Larva shaped as in II., but with proportionately larger head and eyes. 

 Labium with apex of lateral lobe nearly always more or less truncated 

 (a few exceptions, viz. StauropJdebia, j^scJma constricta, ^. clepsydra). 

 Superior appendage always long and hijid at tip. 



Considered zoo-geographically, the JEscItnina^ of Australia fall into three 

 very distinct groups, corresponding exactly with the classification given 

 above. These can be defined as follows : — 



I. Pal^ogenic Group. An archaic remnant of a once abundant and 

 widely-spread group, whose origin and course of development are 

 too remote to be determined with any certainty, but whose present 

 characteristics were most certainly not developed within Australia. ■* 



Tribe Petaliini. 



II. Entogenic Group. A group which has developed its present-day 



characteristics ivithin Australia, and so forms the autochthonous 



TEschnine fauna of the continent *. Tribe Bbachytbiwi. 



* 'This statement does not, of course, imply that non- Australian genera of this group 

 originated in Australia. This group is of polyphyletic origin, and contains the remnants of 

 many lines. 



