BY R. J. TILLYARD. 337 



Subfamily CORDULIIN.E. 

 Group Synthemiua 

 Imagines of slender build and rather weak flight. Anal loop 

 of hindwing of compact form, never as long as wide; basilar 

 (median) space always reticulated. Larvae with head squarish in 

 front, eyes projecting from the anterolateral corners; legs short 

 and hairy; abdomen elongate-oval in shape, villous; wing-cases 

 strongly divergent; distal margin of lateral lobes of labium 

 distinctly dentate. 



Genus 1. Synthemis Selys, a me restrictum. 

 Membranule present, front large, abdomen varying in width, 

 always pinched at 3 or 4 and widening to 7. Superior append- 

 ages of male long and wavy. Female with, at least, a rudiment 

 of an ovij)Ositor, often with a large and conspicuous ovipositor. 

 Larvse of stout build, with a row of hairs along front of head, but 

 tvithout a projecting flat frontal plate. Type: Synthemis eitstalacta 



Burnieister. 



Kei/ to Sjiecies of Synthemis(s.str.). 



Males. 



r Thorax with antehumeral spots or stripes 2. 



I Thorax without antehumeral spots or stripes 3. 



^Thorax with four creamy antehumeral spots .. S. leachii, 



(Thorax with antehumeral stripes 4. 



! Segment 10 of abdomen with a conspicuous dorsal 

 spine or tubercle 5. 



Segment 10 of abdomen without any dorsal spine or 

 tubercle 6. 



{Antehumeral thoracic stripes yellow; colour metallic 

 black with yellow spots S. davicxdata. 

 Antehumeral thoracic stripes pale bluish, short; size 

 of insect small, colour brown with pale bluish 

 spots S. cyanUincta. 



i Dorsal spine black, conical; size of insect large; 



5. ' colours black and yellow 8. regina. 



' Dorsal spine pale yellow, depressed anally 7. 



{Inferior appendage just under half length of superior; 

 colour pinkish-brown with creamy spots S. macrostigma. 

 Inferior appendage considerably over half length of 

 superior; colour black with a few tiny yellow 

 spots S. primigenia, 



{Abdomen blackish with bright yellow spots; inferior 

 appendage two-thirds length of superior, truncate S. eustalacta. 

 Abdomen dark brownish with paler yellow spots; 

 inferior appendage slightly over two-thirds 

 length of superior, truncate S. tanmanica. 



(N.B. — The male of >S. miranda Selys, is unknown.) 

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