Richard Bradley,  A Philosophical account of the Works of nature, Londres, James Hodges, 1739, p. 200-201.

Next to these I place the Libellae, or Pond-flies, or, as some call them, May-flies, pr Cadew-Flies. The Bodies of these Creatures are divided into 3 Parts, as the Insect treared of before; and the Tail Part of the mis like the rest, composed of jointed Annuli. To the central Part of the Body are joined their 6 Legs, and 2 Pair of Wings, curiously wrought, and of a Texture like fine Gauze: Their Eyes, which employ the greatest Part of their Head, appear like Glass: the Colours of their Bodies are for the most Part tending to Green, Blue, or Yellow; and I have not observed above 2 kinds of them which have had any Red about them.
Mr Dandridge and the late curious Mr Petiver have both told me, that there flies proced from the cados-worms; but yet I have not been able to trace any one of these Flies to its original Worm. Nor can I be certain, whether the Worms, when they are cased over, as I have mentionned in my Chapter of Fish, are then in their Chrysalis, or feding State.