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4. a) 1st and 2nd recurrent veins entering 2nd submarginal cell about equally distant from base and apex respectively (Figure 6a); mid basitarsus with posterior margin convex, segment thus broadest medially (Figure 7a); stipes, prementum and first segment of labial palpus with numerous suberect bristles (Figure 8a) ….. Dufourea novaeangliae (Robertson)
b) 2nd recurrent vein entering 2nd submarginal cell usually considerably nearer apex of cell than 1st recurrent vein is to its base (Figure 6b); mid basitarsus parallel sided, posterior margin not convex (Figure 7b); mouthparts without suberect bristles (Figure 8b) ….. Dufourea monardae (Cresson) |
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Figure 6a: D. novaeangliae (female), wing venation, 1st and 2nd recurrent veins entering 2nd submarginal cell equadistant |
Figure 6b: D. monardae (female), wing venation, 2nd recurrent vein entering 2nd submarginal cell nearer than 1st |
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Figure 7a: D. novaeangliae (female), mid basitarsus with posterior margin convex
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Figure 7b: D. monardae (female), mid basitarsus parallel sided, margin not convex
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Figure 8a: D. novaeangliae (female), stipes, prementum and first segment of labial palpus with numerous suberect bristles |
Figure 8b: D. monardae (female), stipes, prementum and first segment of labial palpus without suberect bristles
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