468 NEW AND RARE AUSTRALIAN AGRIONIDiE, 



it is of a robust, almost Agrio7i-hm\d, and where it actually 

 accompanies the only known Australian Agrion {A. lyelli, 

 n.sp.) on the lagoons. As we trace it northwards, we notice 

 a progressive asthenogenetic tendency, the size becoming 

 smaller, the wings narrower, and the build much more slen- 

 der. In North Queensland, I found a small race of this 

 species, flying in company with species of Agriocnemis, along 

 the margins of lagoons. The extremes in size are given by 

 the following measurements : Tasmanian series — Abdomen, 

 cT 23, 9 22; hindwing, cT 15-5, $ 15-5 mm. Cooktown 

 series— Abdomen, ^\9, 219-5; hindwing, ,J11'5, 9I3 mm. 



Caliagrion, n.g. (Plate xlix., fig.8). 



Basal postcostal nervule placed almost under the level of the 

 first antenodal. Venation strong, fairly open. Pterostigma 

 unicolorous, that of hindwing rather elongate. Superior append- 

 ages of male pointed, and carrying a large, basal, projecting 

 inner shelf; not forked or hollowed out; inferior shorter. Pro- 

 thorax of female furnished with two hooks pointing forwards. 

 Large insects, with blue colouration. 



Type: Pseudagrion hillinghursti Martin. 



Very distinct from Pseudagrion Selys, by the position of the 

 basal postcostal nervule, the robust build, larger size, and the 

 form of the superior appendages; but connected with this genus 

 by the intermediate species Ps. ignifer Tillyard, which is retained 

 in Pseudagrion on venational and other characters. 



36. Caliagrion hillinghursti Martin. 



Pseudagrion hillinghursti Martin, loc. cit. p. 246. 



(J.A p p end ag e s : sit])erior 0*7 mm., dorsal surface black, 

 inner shelf blue; viewed from above, pointed, with shelf sub- 

 triangular, large; in profile, thick, slantingly truncated, with the 

 pointed part uppermost; inferior 0-3, thick, blunt, slightly up- 

 turned(Plate xlviii., figs. 19, 20). 



Hab. — Alexandra, Victoria; National Park, N.S.W. Rare. 



Types : (J$, Coll. Martin. 



