PLATE 33. A. Male (a) and female (b) dragon-fly (Calopteryx maculata). The wings of the 

 male are a rich lustrous green, almost black. The wings of the female are very pale green, almost 

 colorless. The male is much more conspicuous. B. Triton cristatus, male, female, and larva. The 

 upper figure is the male. From Brehm's Thierleben. 



