432 NEAV AND RARE AUSTRALIAN AGRIONID^, 



16. NoTONEURA ccELESTiNA Tillyarcl. 

 Alloin'iird rirlcsfiiKf Tillyai'd, /or. rit. 



O" . Appendages: xii ix-nor 0-4 mm., bright blue, ap 

 pearing rather bluntly .subconical from above, but, in profile, 

 distinctly truncate, thick, and even slightly hollowed out: 

 ntfi-nor nearly as long, black, with a conspicuous inferior 

 uptuined hook. (Plate xlvi., figs. 7, 8.). 



llah. — Cairns and Cooktown, N.Q. 



Types: 0*9, CoM. Tillyaid; Cairns, January, 1905. 

 For the venation of this genus, see Plate xlvii., tig. 3 (.V. 

 soUiaria). 



17. IsosTicTA SIMPLEX Martin. 



This species has been well described by Rene Martin in his 

 "Odonates du Continent Australien" (Mem. Soc. Zool. de 

 France, 1901), p. 244, but the appendages of the male arc 

 not figured. As these are very remarkable, I have figured 

 them, both from above and in profile (Plate xlvi., figs. 9, 

 10.). De Selys constituted the genus lao^iicia on the species 

 /. >>pinipes from New Caledonia, of which he possessed only 

 9, single male hicl-iiui flic trliojc of the dhdouini crce'pt nfu/- 

 nifiiils 1-2. It may, however, be fairly assumed that this 

 species, so closely allied to /. simplex in other respects, pos- 

 sessed also appendages of a similar I'emarkable form ; espe- 

 cially as, in the new species described below, a similar form 

 of appendage is fovmd. Apart, therefore, from the vena- 

 tion, which distinguishes this genus from both Allnncvrn 

 and A usf?-ostictri, its closest allies, we may fairly consider the 

 form of the male apjiendages to be a generic character, which 

 may be stated as follows: "Both superior and inferior ap- 

 pendages of male somewhat forcipate, the inferior ])air pro- 

 longed beyond the superior." The only other genus which 

 possesses appendages approaching this form, is A iisfrostirfa, 

 which we may, therefore, regard as a closer ally to Isosticta 

 even than AUoneura itself is. 



