748 ON SOME REMARKABLE AUSTRALIAN CORDULIIN^E, 



crossed medially by a black line; labium pale dirty brownish 

 white, large; genm black; mouth strongly edged with black, 

 Thorax: prothorax hairy, brown, a white mark on the collar, 

 and two pale dorsal spots not very distinct. Meso- and metathorax 

 rich black, a creanry line along dorsal ridge; on each side of it a 

 humeral line, cream-coloured, about 1-5 mm. long, followed behind 

 by a creamy spot; sides marked with a large dull irregular creamy 

 blotch something like the letter " n " slightly flattened; lower 

 parts of sides and underside marked irregularty with dull grey; 

 notum brownish-black, a conspicuous white spot on mesoscutellum. 

 Legs brownish, underside of femora black, tibiae black. Abdo- 

 men very slender, cylindrical, black, marked with straw-colour 

 as follows : — 2, a pair of dorsal marks, slightly slanting, nearly 

 touching; spurs very small, a tiny white point on each; genital 

 appendages dirty brownish with a grey basal lateral spot touch- 

 ing them on each side; 3-6, a pair of basal marks nearly touching 

 above, and running down on the underside, also a pair of rounder 

 central spots, very narrow on 5-6, separated by the dorsal carina; 

 7 with ver}'- small basal marks, and flat central spots placed one- 

 third from base of segment; 8, a pair of spots one-third from 

 base; 9-10 black. Appendages: superior short, 1*8 mm., 

 well separated, straight, pointed, carrying a number of long stiff 

 black hairs, two or three of which protrude from the tips. 

 Inferior nearly as long, narrow, upcurved, hairy, black. (See 

 Plate xxi., figs. 13, 14). 



Q. Unknown. 



Hob. — Cooktown, N.Q.; January, 1908. Very rare. 



Two males taken in a sequestered spot on the mountains, where- 

 it inhabits a small boggy stream. It has an easy soaring flight, 

 usually keeping high up round the trees, and often settling on 

 them. 



This species is by far the smallest member of the genus Syn- 

 themis yet discovered, and exhibits some striking differences from 

 the more typical members of this large and complicated genus. 

 In its thin cylindrical abdomen and in the form of its appendages 

 it shows a close relationship to S. flavoterminata Martin. One 



