472 NEW AND RARE AUSTRALIAN AGRIONID^, 



Group iv. Telebasis. 



AciAGRiON Selys. (Plate xlix., fig.22). 



Selys, ^'■Odonates de Birmanie," 1891, p.77. 



This genus forms tlie passage between Groups iii.( Pse?*c?a^rion), 

 and iv. {Telebasis), but should most certainly be included in the 

 latter, on account of its excessively slender build, and the very 

 close approximation of the median sector to the nodal vein. I 

 consider this genus, and also Stenohasis, to be very close to 

 Pseudagrion itself; they are, in fact, the same race of insects just 

 one stage removed asthenogenetically, and preserving the same 

 colour-pattern and habits. Selys himself originally described the 

 type-species, Aciagrion hisopa, as a race of Pseudagrion mieroce- 

 phalum, while I have to confess that my three males of Stenohasis 

 mimetes, n.sp., completely deceived me at first, and were placed 

 merely at a glance, without any thought of differences, into my 

 series of the variable Pseudagrion aiistralasue: doubtless in both 

 cases we were misled by the remarkable similarity of the colour- 

 pattern. 



41. Aciagrion fragilis Tillyard. 



Ischnura fragilis Tillyard, loc. cif., p. 186. 



Specimens of this insect were forwarded to M. Rene Martin, 

 who is acquainted with the type-species, A. hisopa, and deter- 

 mined by him to be Aciagrion, without any doubt. 



(J. Appendages: superior 0-25 mm., black, bluntly subtriangular, 

 divergent; inferior 0-15 mm., rounded(Plate xlviii., figs.31, 32). 



Types : ^^, Coll. Tillyard. 



fJab. — Atherton and Cooktown, N. Queensland. 



42. Stenohasis mimetes, n.sp.(Plate xlvi., fig.21, 22). 



$. Total length 40, abdomen 33, hindwing 22 mm. 



Wings: inferior sector of triangle reaching jitst up to basal 

 postcostal nervule, which is placed slightly nearer to the level of 

 the second antenodal than the first. Pterostlgma^)-^ mm., nearly 

 square, slanting slightly outwards; dark grey, with distal inferior 

 border slightly paler; covering less than one cellule; 12-13 post- 

 nodals. Hind wing-joins very prominent, black. Head: (colours 



