Calopteryx_splendens_male  Calopteryx 

Banded demoiselle (C. splendens) and Beautiful demoiselle (C. virgo) males are flying above slow running water. The males are colored blue. Males may defend a territory above the stream. Males will use their colored wings for signalling and  communication.

In the Netherlands two species of Calopteryx occur, C.splendens (Banded demoiselle) and C. virgo (Beautiful demoiselle). The wings of C. splendens males are partly blue, the wings of C. virgo are completely blue.
Calopteryx_splendens_male              Spoordonk_H_Eik_Bosbeekjuffer_mn_030611_1552A_part
C. splendens (left)    and C. virgo (right)
 
The behaviour of both species is only different in detail.
  
Calopteryx splendens Normal flight
Calopteryx_cruising_anim
 
Courtship of C. splendens
Courtship includes a phase in which the male is moving its wings approximately horizontally with the forewings and the backwings approximately in antiphase. This mode of flying is given 30 times retarded in the animation. The real frequency of the wingbeat is 40 Hz.
Calopteryx_fastwing_30tim_retarded
Calopteryx splendens Courting behaviour retarded 30 times.
 
The male is indicating the female a small area with water- weeds for laying eggs. This behaviour may be called water-display.

Courtship of C. virgo
Here too courtship includes a phase in which the male is moving its wings approximately horizontally. However the backwings are approximately a quarter period retarded compared to the forewings.
Spoordonk_040611_1649_Bosbeekjuffer_mn_balts_anim
Courtship of C. virgo male (animation 30X retarded)
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