492 NEW AUSTRALIAN SPECIES OF THE FAMILY LIBELLULIDM. 



£. Total length 68 mm.; abdomen 50 mm.; wings, fore 50 mm., 

 hind 46-5 mm. Wings: Pterostigma 3 mm., blackish. Mem- 

 branule, fore, 3mm. broad; hind, 5mm., narrower, semidiaphanous, 

 greyish-white. Nodal Indicator 112-14 6-7 I Head metallic 

 steel-coloured, with a pair of! 8-9 7-101 frontal yellow spots, 

 and yellow postclypeus. Thorax deep brown with steely blue 

 reflections; dorsal ridge yellow, a pair of broad straight sub- 

 humeral yellow bands, below them a broader yellow band, parallel, 

 passing transversely across the notum between the wing-joins. 

 Abdomen flat, flabby, and apparently ill-nourished in all three 

 specimens. Colour black with bright yellow bands as follows — 

 a broad yellow band encircling 2; 3 nearly all yellow; 4 similar 

 to 3 but with less yellow; 5-6 a narrow irregular central yellow 

 band; 7, basal half yellow; 8, an irregular transverse basal yellow 

 band; 9-10 black. Appendages 1/5 mm., wide apart, flattish, 

 narrow subtriangular, sharply pointed, black (Plate xliv., figs. 7-8). 



It flies swiftly in the dense bush and occasionally along the 

 densely wooded creeks and rivers. Very difficult to capture. 



EXPLANATION OF PLATE XLIV. 



Fig. 1. — Rhyothemis Alcestis n.sp. ( ? ); appendages. 



Fig. 2. — Grocothemis erythrcea Bra\\6; triangle and part of discoidal area of 



forewing. 

 Fig. 3. — Erythemis rufa Ramb. ,, ,, ,, 



Fig. 4. — (?)Agrionoptera insignis Ramb.^); appendages, dorsal view. 

 Fig. 5. — ,, ,, ,, ,, ,, lateral view. 



Fig. 6.— Tetrathemis Jlavescens Kirby( $ ); appendages. 



Fig. 7. — Macromia Tillyardi Martin, n.sp.( ? ); appendages, dorsal view. 



Fig. 8. — ,, ,, ,, ,, ,, lateral view. 



