72 MR. R. J. TILLYARD : LIFE-HISTOEIES AND 



just basal to the centre of the lobe, are short (Plate 6. fig. 11). T h o r a x. — 

 Protlwrax not very wide, but not so narrow as in Anax ; carrying a dorso- 

 lateral and two sublateral spines on each side. Meso- and metathorax 

 narrow, fairly smooth ; wing-cases 9 mm., those of hind-wing 2"5 mm. wide. 

 Legs very short ; hind femur onl}' 7 mm., narrow, not flattened ; colour dark 

 brown with pale markings. Abdomen of the usual shape, but slenderer 

 and less well-rounded above than in y^schna. No dorsal spines ; lateral 

 spines on Q-9, those of 6 very small, 7-9 medium, that of 9 not reaching to 

 level of middle of 10. Appendage s. — Superior 3'5, slender, bifid at tip ; 

 inferior very sharp, about the same length or a little sJwrter (Plate 7. figs. 12, 

 25). Involucres : (J superiors 3 mm., slender, pointed, reaching nearly to 

 end of appendages; (^ inferior short, broad, triangular, 1 mm. ; ? very long, 

 3'2 mm., slender, pointed, reaching ver^ nearly to end of appendages. 

 Ovipositor large, reaching to near middle of 10 (Plate 9. fig. 3). Colour 

 probably brown or greenish, with dark dorsal and lateral abdominal bands. 



Larval Types: c? ?, Coll. Tillyard. (Banks Island, Torres Straits, 

 February 1910 ; taken by the late Mr. H. Elgner.) 



In a note despatched to me with these larvse, Mr. Elgner mentioned that 

 he found them transforming along the edges of a small lagoon. It would 

 appear, therefore, that this species resembles Anax in breeding in still water. 



Habitat. In Australia, G. rosenhergi is confined to North Queensland 

 and the Northern Territory, where it is quite common. It spreads westward 

 to Singapore and northward to Japan. 



Its habits are distinctly crepuscular. During the summer it frequently 

 comes to light, and may be seen darting about the ceiling of a room like a 

 hawk-moth, or hanging motionless on a wall or window-pane. On hot days 

 I have found it flying low in the dense undergrowth of mangrove-swamps 

 edging river estuaries. It keeps very low and is very difficult to capture. 

 It is a very dull, ugly species, and has the habit (fortunately uncommon in 

 Odonata) of developing grease and fungus very badly in the cabinet. 



Types : c? ? , Coll. Selys. 



Gynacantha mocsaryi, Forster. 



Forster, Odon. aus Neu-Gruinea, 1898. 



This species is rarer than the preceding, but occurs not uncommonly in 

 North Queensland, where I have taken it in dense scrub, in rail way- tunnels, 

 and also at light. Two specimens were taken by me in the long tunnel 

 No. 15 on the Cairns-Kuranda railway. They were flying slowly up and 

 down, about noon, and their brilliant green eyes appeared most remarkable 

 in the gloom. It is easily distinguished from G. rosenhergi by its slenderer 

 and more graceful form, with segment 3 much pinched, its greenish thorax, 

 the pattern of blue in the form of a cross on segment 2, and the form of the 



