On a new Dragonfly from Northern Australia. 105 



XV. — A new Agrionine Dragonfly from Northern Australia. 

 By Herbert Campion (Imperial Bureau of Entomology, 

 London). 



A few dragonflies have been included from time to time in 

 the collections of insects sent to the Imperial Bureau of 

 Entomology, for identification, by Mr. Gerald F. Hill, the 

 Government Entomologist of the Northern Territory, 

 Australia. Among these I find a small male and female 

 evidently belonging to an undescribed species of* Austro- 

 agrion, Tillyard, an Australian genus containing, so far, two 

 species only. The main definition of Austroagrion, with 

 which the present species agrees, will be found in Proc. Linn. 

 "Soc. N. S. Wales, xxxvii. 1912, p. 466 (1913). On p. 419 

 of the same publication, however, an additional character is 

 given, namely, " Superior appendages of male longer than 

 inferior/' but in our male the two pairs of appendages are 

 about equal in length. 



The new species may be immediately distinguished from 

 Austroagrion cyane ) Selys, to which it appears to come 

 nearest, as well as from A. coeruleiim, Tillyard, by the form 

 of the anal appendages in the male. For the two older 

 species these appendages have been figured both by Dr. F. 

 His (' Fauna Siidvvest-Australiens,' ii. 24, figs. 10 & 11, 1910) 

 and by Mr. R. J. Tillyard {I. c. pi. xlviii. figs. 27-30, 1913), 

 and Dr. Ris's figures are accompanied by a parallel state- 

 ment of other differences between the insects compared. 



The following key will separate the males of the three 

 species, but I have made no attempt to tabulate the respective 

 females : — 



Lower anal appendages, in profile view, con- 

 spicuously shorter than the upper appendages, 

 and without any central posterior process. 



Segments 8 and 9 entirely blue coeruleum, Tillyard. 



Segments 8 and 9 blue and bronze-black cyane, Selys. 



Lower anal appendages, in profile view, nearly as 

 long as the upper appendages, and with a long 

 central posterior process ; segments 8 and 9 

 blue and bronze-black exclamationis, sp. n. 



For the loan of material of A. cyane I am indebted to the 

 kindness of my friends Dr. F. F. Laidlavv (1 $ , Illawarra, 

 N.S.W.) and Air. K. J. Morton (1 <J , 1 ?, Gisborne, 

 Victoria). 



