BY R. J. TILLYARD. 397 



New South Wales. The following characteristics will at once 

 distinguish the two species : — 



(J. The (J of D. lestdides is a larger insect that D. euphoeo'ides, 

 but its wings are decidedly narrower. Moreover, the wings of 

 D. lestdides ^ are never clouded even with the palest brown, 

 while those of D. euphoeo'ides ^ even in v^ery immature speci- 

 mens are distinctly clouded. In D. lestdides (J, about half-way 

 between the nodus and pterostigma, there is a milk-white bar of 

 thickness varying from 1*5 to 3 mm. running across the wing; 

 this is absent in D. euphoBdides. In D. lestdides ^ the ground 

 colour of the whole abdomen is blue; in D. evphcedides ^ only 

 the first three segments and 8-9 are blue, the rest being black. 

 As regards the appendages, the superior ones in 1). lestdides are 

 distinctly larger than those of D. euphoedides; while the inferior 

 are absolutely different; those of D. eiiplioedides being subcylin- 

 drical and with blunt rounded tips, while those of D. lestdides 

 are scarcely one-fourth as long as the superior, and are wide and 

 distinctly square at the tips, and even somewhat hollowed out so 

 as to appear slightly bifid when viewed laterally. It may also 

 be observed that the abdomen of D. lestdides ^ is distinctly flat- 

 tened, rather wide, and of practically the same width from end 

 to end, while that of Z>. euphvedides is much narrower and varies in 

 width, being widest at 1-2, then tapering gracefully to 7, then 

 slightly enlarged again to 10. It is also distinctly rounded and 

 not flattened. The second segment of the abdomen is hairy in 

 D. lestdides (J, smooth in D. euphcedides. 



5. The two females, if placed side by side, would be more diffi- 

 cult to distinguish, as they are very similar in general colouration 

 and appearance. But D. lestdides 9 is distinctly larger than 

 D. euphcedides 9; its wings are very seldom suffused with brown, 

 and are much narrower than those of the latter, especial]}'- 

 towards the tips, which in D. euphcedides are beautifully rounded. 

 The pterostigma is always very pale brown between black ner- 

 vures in D. lestdides; in D. euphcedides 5 it is a medium brown, 

 and in ^ a very dark brown. The appendages are very similar. 

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