74 MR. R. J. TILLYARD : LIFE-HISTORIES AND 



"The genus is monotypic, and must be regarcjed as a specialized offshoot 

 from the main Gynacantlia-siem. Though now apparently confined to 

 Australia, it must be included in the ectogenic series, o£ which it forms an 

 essential part. 



AusTROGYNACANTHA HETEROGENA, Tillyard. (Plate 4- fig. 9.) 



Tillyard, loc. cit. p. 428 ( ? , Selys MSS., name not published). 



Habitat. Cooktown, Rockhamptou, Brisbane. A pair taken by 

 Mr. Hacker last January at Clayfield Creek, Brisbane, while I was out 

 collecting with him, are now in my collection, together with a fine series 

 sent by Mr. Olive from Cooktown. I saw this s])ecies also at Sherwood and 

 Indooroopilly, suburbs of Brisbane, but failed to capture it. It flies rather 

 high round trees and bushes. The colour-scheme is lemon-yellow on dark 

 brown, with a tinge of green on the (borax, and is very striking. 



Types : c? ? , Coll. Tillyard (Cooktown, February 1908) ; ? , Coll. 

 Selys (Rockhampton) . 



Genus 3. Heli^schna, Selys. 



Characters as given (see above). 



Type: Helia^schjia fuliginosa, ^e\js. 



Distinguishable at once from the two foregoing genera by having its 

 basilar space reticulated. The form of M.j is rather that of Austrogynacantha, 

 while the anal triangle of the male is of intermediate shape.. The fork under 

 segment 10 of the female is two-pronged. 



Heli^schna simplicia, Karscli. 



Karsch, Bnt. Nachr. 1891. 



The claim of this insect to inclusion in the Australian Odonate fauna rests, 

 like that of Gynacantha dolirni, on a single specimen in the Leyden Museum, 

 labelled " Cooktown. '"" Both insects range from Sumati'a to Borneo, and 

 their occurrence at Cooktown is quite possible, though I have never met with 

 either of them, nor seen them in any collections from Queensland. Is it not 

 possible that there has been a mistake in the labelling, or that specimens 

 taken in the islands may have been brought to Cooktown and sent to Leyden 

 from there? 



