648 ON SOME REMARKABLE AUSTRALIAN LIBELLULIN.E, 



half of 3 yellow, anal half black; 4-10 black, a transverse basa t 

 yellow band on 4; a basal yellow spot on each side of 5-6; basal 

 half of 7 yellow. Appendages : superior 1 mm., slender, 

 black, somewhat hooked; inferior 1 mm., subtriangular, blackish, 

 tip upcurved. 



Q. Similar to male, wings slightly longer; abdomen slightly 

 shorter, 1-2 slightly enlarged. Bases of wings to nodus con- 

 spicuously suffused in mature specimens. Labrum black, with two 

 round yellowish spots. Abdomen coloured as follows — 1-2 

 yellow, 3 yellow, a basal black band and a longitudinal black 

 band on dorsum; 3-4 with a black line showing on supplementary 

 carina; 4-6 with a large yellow mark on each side; 7, basal two- 

 thirds yellow; 8-10 black; 9-10 very short; 10 with a projecting 

 tongue underneath, brownish. Append ages very short, wide 

 apart, straight, pointed, black. 



Hob. — Cooktown, N.Q. Rare; January, 1908. 



I have named it T. cladophila because of its great fondness for 

 returning again and again to the same twig, even after being 

 frightened away with the net. 



This quaint little dragonfly differs considerably from the Tetra- 

 themis which I took at Cairns in 1905; the latter was determined 

 by M. Rene Martin as identical with T. flavescens Kirby, from 

 Borneo. The chief difference is that the vertex and thorax of 

 T. flavescens are brown; the yellow shading of the wings only 

 apparent at the bases and near the nodus, and not throughout the 

 basal half of the wings. The markings of the abdomen and the 

 shape of the appendages and tenth segment of the female also 

 differ considerably. [For purposes of comparison, see pp 487-488, 

 these Proceedings for 1 906, " New Australian Species of the 

 Family Libellulidce."] 



It is interesting to note that the vertex presents the same 

 difference in T. cladophila and T. flavescens as it does in Nanno- 

 phlebia Lorquini and N. eludens. But in the former two the 

 difference has extended to the thorax also, which is metallic in 

 T. cladophila. 



