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SOME DESCRIPTIONS OF NEW FORMS OF 

 AUSTRALIAN ODONATA. 



By R. J. Tillyard, M.A., F.E.S. 



(Science Research Scholar of the University of Sydney). 



(Plate xv.) 



The following new species and subspecies are here recorded 

 and described : — 



Pseudocordulia elliptica, n.sp.^. 



Metathemis nigra xanthosticta, n.subsp. )( ^Q. 



Metathemis guttata melanosoma, n.subsp.,^^. 



Austrogomphus angeli, n sp.,^^. 



Diphlebia euphceo'ides cosrulescens, n.subsp., <JQ. 



Diphlebia hybrido'ides Tillyard, Q(£ only described already). 



Argiolestes chryso'ides, n.sp.(J. 



Synlestes albicauda, n.sp.,^^. 



1. Pseudocordulia elliptica, n.sp. 



£. Total length 49, abdomen 37, forewing 32, hindiving 32 mm. 



Wings: neuration exactly as in Ps. circularis Tillyard; a 

 white spot at base of costa in forewing; hindwing saffroned at 

 base. Pterostigma 1*5 mm., black. Nodal Indicator ((10-11, 7-9 

 Head: vertical tubercle fairly large, dark violet; | 7,9-11 

 front wide, hairy, very deeply cleft medially, dark brown, with 

 deep violet reflections above; clypeus and labrum dark brown; 

 labium medium brown. Thorax: prothorax brown, hairy. 

 Meso- and metathorax deep steely metallic greenish, with light 

 brown hairs. Legs black, brownish near coxa?. Abdomen 

 slender; 1-2 rather narrow, 3 pinched in middle, 4-6 widening, 

 7-8 narrowing, 9-10 cylindrical; 1, with grey hairs above; 2, with 

 dark brown auricles; all the rest jet black without spot. A p- 

 pendages: superior 1*5 mm., black, slightly forcipate; viewed 

 from above, they form a slightly pointed oval; in profile, they are 



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