264 STUDIES IN THE LIFE-HISTOKIES OF AUSTRALIAN ODONATA. 



each tarsus is apparently 3-segmented; the divisions not clearly 

 shown, but apparently slanting forward, and the two basal 

 segments short and carrying a set of longish hairs on the inner 

 side; end of tibia also with spines on each side, especially on tlie 

 forelegs. Abdomen: length 32-33 mm., greatest breadth 

 10 mm. at segment 6; subcylindrical, widest at 6, then tapering 

 to 10, which is only 4 mm. wide; dorsal surface well rounded, 

 ventral surface rather flat, segments 1-8 carrying below two deep 

 parallel indentations, separating each segment into a large and 

 somewhat convex central area and a pair of narrower side-portions; 

 genitalia showing plainly beneath 2 and basal half of 3. Segments 

 5-9 with soft hairs along apical sutures. Appendage s( Plate 

 xxiv., fig.6; s, superior; i, inferior appendage) of remarkable form; 

 the superior appendages appearing as small rounded projections 

 on each side, and the wide inferior appendage lying between and 

 above them; anus lying between and somewhat below superior 

 appendages, distinctly ridged underneath. The two small 

 tubercles just visible on each side of the inferior appendage 

 represent the two sharp points in the imago. 



O. Measurements usually the same as in the male {J. have one 

 dwarf female only 45 mm. long). Abdomen slightly wider and 

 more cylindrical from 1-8. Segment 9 with o\ipositor showing 

 beneath as a broad and rather blunt curved projection reaching 

 just on to 10. Segment 11 ( = appendages in imago) somewhat 

 tetrahedral in shape, with anus rather high up (Plate xxiv., fig.7, 

 a, anus; &, ovipositor). 



In a newly emerged male taken by me, the superior appendages 

 were soft and damp, hanging straight downwards; the inferior 

 was of a pale yellow colour and rather harder, and still having 

 its side points above the superior. Evidently the insect places 

 the latter in position by a muscular effort as soon as they are 

 strons enough. I have also noticed that an immature male 

 captured and placed in a paper triangle, will often force its 

 inferior appendage up into position above the superior ones, 

 which he depresses. Even in their natural position the points of 

 the inferior appendage practically rest against the superiors. 



