352 MONOGRAPH OF THE GENUS SYNTHEMIS, 



lateral creamy band, lower part of sides dull greyish; notum, 

 brown with creamy scutella; legs black. Four distinct creamy 

 spots at wing-bases. Abdomen pinched somewhat at 3, also 

 at 8-10. Colour : 1, brown with a creamy dorsal spot; 2 brown, 

 a pair of slanting basal marks,*and top of auricles, creamy; 3-10 

 black, spotted with cream as follows: — 3-8, a pair of triangular 

 basaj spots, and a pair of central roundish spots, the former 

 diminishing from 3 to 8, being only lines in 8, the latter rather 

 pointed basally in 3, round in 4 to 7, smaller and pointed apical ly 

 in 8; 9 black, often with two tiny spots; 10, with a large central 

 oval or diamond-shaped spot, two tiny lateral spots. Append- 

 ages: superior 3*8 mm., somewhat forcipate at tips, black; 

 inferior 2'2 mm., narrow subtriangular, slightly upcurved, pale 

 brownish with darker tip. (See Plate vii., figs. 5« and h.) 



^. Similar to male but somewhat larger; hindwing 35 mm. 

 Wings shaded with brown at bases; pterostigma 4 mm., pale. 

 Head and thorax as in male but somewhat duller in colour, 

 thoracic spots generally larger and more irregular; abdomen 

 cylindrical, broader than in male, with larger spots; 9-10 short 

 and narrow; ovipositor reaching nearly to end of 10, with a blunt 

 upcurved tip; appendages OS mm., short, straight, black. (See 

 Plate vii., fig. 18). 



Types: ^. Briti.sh Museum(" New Holland "); $. Coll. Till- 

 yard( Bridgetown, S.W.Australia). 



Hab. — South-Western Australia, from Perth to Cape Leeuwin. 



It occurs fairly commonly on all running streams and moun- 

 tain brooks, very occasionally also on freshwater lagoons. 



Like all Synthemids, it has an easy flight and is not difficidt 

 to capture. In spite of its dull colouration, it is a most beautiful 

 insect when flying; the eyes gleam like living emeralds. Its 

 nearest ally is S. macrostigma, from which it is easily dis- 

 tinguished by its slightly greater size, darker colouration, the 

 four thoracic spots, and the larger inferior appendage of the male. 



6. Synthemis macrostigma Selys. (Plate iv., fig. 5.) 

 Selys, loc. cit. 1871 and 1874. 



