358 MONOGRAPH OF THE GENUS SYNTHEMIS, 



which often gather in tufts when wet. Appendages : superior 

 I'Smm., tip curved downwards; two inferior 21 ram., straight; 

 two lateral 0-8 mm., straight. In the dentition of its labium, 

 this species shews the closest approximation to C or duleg aster. 

 It is probably as deeply dentate as that of any known Corduline 

 nymph, except Cordtilej^ht/a. Types : Coll. Tillyard(Leura, Blue 

 Mountains). 



7. Synthemis primigenia Forster. 



Forster, Odonaten aus Neu-Guinea, 1903. 



The following abridgment of Forster's description (in German) 

 will be sufficient to give the points of detail in which this species 

 differs from the others : — 



(J. Abdomen 45-48 mm , hindwing 34-36 mm. 



Wings: costa pale yellow in front; 2J^e^ostigma 2 mm., black; 

 memhranide 2"5 mm., greyish. One row of post-trigonal cells, one 

 cross-vein in basilar space. Head: vertex metallic blue; front 

 cleft medially, metallic blue, lower third yellow; face and lahivm 

 brilliant brownish-black, base of anteclypeus pale yellowish-green. 

 Thorax: prothorax black, yellow on front and hind borders. 

 Meso- and metathorax brilliant metallic-blue, a yellow line on 

 dorsal ridge; sides with a broad yellow band enclosing the meso- 

 spiracle; underside yellowish. Legs short, black. Abdomen 

 very slender, pinched at 3, broadening to 8, 9-10 narrower. 

 Colour jet black; 2-4, two round yellow dots in middle, traces of 

 same on 5-6; 8 with a longer yellow spot finely divided dorsally,, 

 7 and 9-10 quite black. Appendages: superior 3 mm., black, 

 somewhat forcipate towards tips; inferior scarcely two-thirds as 

 long as superior, narrow subtriangular (see Plate vii., figs. 7a and 

 b). 



5. Abdomen 47, hindwing 41 mm. Abdomen stouter and more- 

 cylindrical than in male, black, willi yellow dashes or dots as 

 follows — middle of 2, each side of base of 3, two fine dots on 

 middle of 4-6; underside reddish-brown. Ovipositor very long 

 and sharp, extending well beyond the end of segment 10. 



Types: ^. National Museum of Hungary; ^^. Coll. Forster 

 (Huon Gulf, Simbang, and Tamai Island, New Guinea). 



